Security bulletins

All security bulletins for the following products are described in this page:

  • Google Kubernetes Engine (GKE)
  • GKE on VMware
  • GKE on AWS
  • GKE on Azure
  • GKE on Bare Metal

Vulnerabilities are often kept secret under embargo until affected parties have had a chance to address them. In these cases, the product's release notes will refer to "security updates" until the embargo has been lifted. At that point the notes will be updated to reflect the vulnerability the patch addressed.

When GKE issues a security bulletin that directly correlates to your cluster configuration or version, we might send you a SecurityBulletinEvent cluster notification that provides information about the vulnerability and actions that you can take, if applicable. For information about setting up cluster notifications, refer to Cluster notifications.

For more information on how Google manages security vulnerabilities and patches for GKE and GKE Enterprise, see Security patching.

GKE and GKE Enterprise platforms don't use components such as ingress-nginx and the CRI-O container runtime, and are unaffected by any vulnerabilities in those components. If you install components from other sources, refer to the security updates and patching advice of those components at the source.

Use this XML feed to subscribe to security bulletins for this page. Subscribe

GCP-2024-030

Published: 2024-05-15
Reference: CVE-2023-52620

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-52620

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.13-gke.1166000
  • 1.28.8-gke.1095000
  • 1.29.3-gke.1093000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-52620

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-52620

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-52620

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-52620

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-029

Published: 2024-05-14
Reference: CVE-2024-26642

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26642

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.13-gke.1166000
  • 1.28.8-gke.1095000
  • 1.29.3-gke.1093000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26642

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26642

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26642

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26642

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-028

Published: 2024-05-13
Updated: 2024-05-22
Reference: CVE-2024-26581

2024-05-22 Update: Added patch versions for Ubuntu nodes.

GKE

Updated: 2024-05-22

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26581

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-05-22 Update: The following versions of GKE are updated with code to fix this vulnerability on Ubuntu. Upgrade your Ubuntu node pools to the following versions or later:

  • 1.26.15-gke.1300000
  • 1.27.13-gke.1011000
  • 1.28.9-gke.1209000
  • 1.29.4-gke.1542000
  • 1.30.0-gke.1712000

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.25.16-gke.1596000
  • 1.26.14-gke.1076000
  • 1.27.11-gke.1202000
  • 1.28.8-gke.1095000
  • 1.29.3-gke.1093000

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.26.15-gke.1300000
  • 1.28.9-gke.1209000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26581

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26581

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26581

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26581

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-027

Published: 2024-05-08
Updated: 2024-05-09, 2024-05-15
Reference: CVE-2024-26808

2024-05-15 Update: Added patch versions for GKE Ubuntu node pools.

2024-05-09 Update: Corrected severity from Medium to High and clarified that GKE Autopilot clusters in the default configuration are not impacted.

GKE

Updated: 2024-05-09, 2024-05-15

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26808

2024-05-09 Update: Corrected severity from Medium to High. The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.


GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-05-15 Update: The following versions of GKE are updated with code to fix this vulnerability on Ubuntu. Upgrade your Ubuntu node pools to the following versions or later:

  • 1.26.15-gke.1323000
  • 1.27.13-gke.1206000
  • 1.28.10-gke.1000000
  • 1.29.3-gke.1282004
  • 1.30.0-gke.1584000

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.8-gke.1067000
  • 1.28.8-gke.1095000
  • 1.29.3-gke.1093000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26808

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26808

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26808

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26808

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-026

Published: 2024-05-07
Updated: 2024-05-09
Reference: CVE-2024-26643

2024-05-09 Update: Corrected severity from Medium to High.

GKE

Updated: 2024-05-09

Description Severity

2024-05-09 Update: Corrected severity from Medium to High.


The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26643

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.8-gke.1067000
  • 1.28.8-gke.1095000
  • 1.29.3-gke.1093000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26643

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26643

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26643

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26643

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-024

Published: 2024-04-25
Reference: CVE-2024-26585

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26585

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.25.16-gke.1759000
  • 1.26.15-gke.1158000
  • 1.27.12-gke.1190000
  • 1.28.8-gke.1175000
  • 1.29.3-gke.1282000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26585

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26585

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26585

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-26585

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-022

Published: 2024-04-03
Updated: 2024-04-24
Reference: CVE-2023-45288

2024-04-24 Update: Added patch versions for GKE.

GKE

Updated: 2024-04-24

Description Severity

A Denial-of-Service (DoS) vulnerability (CVE-2023-45288) was recently discovered in multiple implementations of the HTTP/2 protocol, including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane. GKE clusters with authorized networks configured are protected by limiting network access, but all other clusters are affected.

GKE Autopilot and Standard clusters are affected.

What should I do?

2024-04-24 Update: Added patch versions for GKE.

The following versions of GKE include the Golang security patches to fix this vulnerability. Upgrade your GKE clusters to the following versions or later:

  • 1.25.16-gke.1759000
  • 1.26.15-gke.1158000
  • 1.27.12-gke.1190000
  • 1.28.8-gke.1175000
  • 1.29.3-gke.1282000

The golang project released patches on April 3, 2024. We'll update this bulletin when GKE versions that incorporate these patches are available. To request a patch on an accelerated timeline, contact support.

Mitigate by configuring authorized networks for control plane access:

You can mitigate your clusters from this class of attacks by configuring authorized networks. Follow the instructions to enable authorized networks for an existing cluster.

To learn more about how authorized networks control access to the control plane, see How authorized networks work. To see the default authorized network access, view the table in the Access to control plane endpoints section.

What vulnerabilities are addressed by this patch?

The vulnerability (CVE-2023-45288) allows an attacker to execute a DoS attack on Kubernetes control plane.

High

GKE on VMware

Description Severity

A Denial-of-Service (DoS) vulnerability (CVE-2023-45288) was recently discovered in multiple implementations of the HTTP/2 protocol, including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane.

What should I do?

The golang project released patches on April 3, 2024. We'll update this bulletin when GKE on VMware versions that incorporate these patches are available. To request a patch on an accelerated timeline, contact support.

What vulnerabilities are addressed by this patch?

The vulnerability (CVE-2023-45288) allows an attacker to execute a DoS attack on Kubernetes control plane.

High

GKE on AWS

Description Severity

A Denial-of-Service (DoS) vulnerability (CVE-2023-45288) was recently discovered in multiple implementations of the HTTP/2 protocol, including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane.

What should I do?

The golang project released patches on April 3, 2024. We'll update this bulletin when GKE on AWS versions that incorporate these patches are available. To request a patch on an accelerated timeline, contact support.

What vulnerabilities are addressed by this patch?

The vulnerability (CVE-2023-45288) allows an attacker to execute a DoS attack on Kubernetes control plane.

High

GKE on Azure

Description Severity

A Denial-of-Service (DoS) vulnerability (CVE-2023-45288) was recently discovered in multiple implementations of the HTTP/2 protocol, including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane.

What should I do?

The golang project released patches on April 3, 2024. We'll update this bulletin when GKE on Azure versions that incorporate these patches are available. To request a patch on an accelerated timeline, contact support.

What vulnerabilities are addressed by this patch?

The vulnerability (CVE-2023-45288) allows an attacker to execute a DoS attack on Kubernetes control plane.

High

GKE on Bare Metal

Description Severity

A Denial-of-Service (DoS) vulnerability (CVE-2023-45288) was recently discovered in multiple implementations of the HTTP/2 protocol, including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane.

What should I do?

The golang project released patches on April 3, 2024. We'll update this bulletin when GKE on Bare Metal versions that incorporate these patches are available. To request a patch on an accelerated timeline, contact support.

What vulnerabilities are addressed by this patch?

The vulnerability (CVE-2023-45288) allows an attacker to execute a DoS attack on Kubernetes control plane.

High

GCP-2024-018

Published: 2024-03-12
Updated: 2024-05-06
Reference: CVE-2024-1085

2024-05-06 Update: Added patch versions for GKE Ubuntu node pools and removed an extra horizontal line element from the 2024-04-04 update.

2024-04-04 Update: Corrected minimum versions for GKE Container-Optimized OS node pools.

GKE

Updated: 2024-05-06

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-1085

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-05-06 Update: The following versions of GKE are updated with code to fix this vulnerability in Ubuntu. Upgrade your Ubuntu node pools to the following versions or later.

  • 1.26.15-gke.1158000
  • 1.27.12-gke.1190000
  • 1.28.8-gke.1175000
  • 1.29.3-gke.1093000

2024-04-04 Update: Corrected minimum versions for GKE Container-Optimized OS node pools.

The minimum GKE versions containing the Container-Optimized OS fixes listed previously were incorrect. The following versions of GKE are updated with code to fix this vulnerability on Container-Optimized OS. Upgrade your Container-Optimized OS node pools to the following versions or later:

  • 1.25.16-gke.1520000
  • 1.26.13-gke.1221000
  • 1.27.10-gke.1243000
  • 1.28.8-gke.1083000
  • 1.29.3-gke.1054000

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.25.16-gke.1518000
  • 1.26.13-gke.1219000
  • 1.27.10-gke.1240000
  • 1.28.6-gke.1433000
  • 1.29.1-gke.1716000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-1085

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-1085

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-1085

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-1085

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-017

Published: 2024-03-06
Reference: CVE-2023-3611

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3611

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1021001
  • 1.27.3-gke.1001002

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1021001
  • 1.27.3-gke.1001002

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3611

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3611

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3611

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3611

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-014

Published: 2024-02-26
Reference: CVE-2023-3776

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3776

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1014001
  • 1.27.3-gke.1001002
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1021001
  • 1.27.3-gke.1001002

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3776

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3776

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3776

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3776

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-013

Published: 2024-02-23
Reference: CVE-2023-3610

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3610

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.3-gke.1001002
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1021001
  • 1.27.3-gke.1001002

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3610

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3610

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3610

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-3610

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-012

Published: 2024-02-20
Reference: CVE-2024-0193

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-0193

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.10-gke.1149000
  • 1.28.6-gke.1274000
  • 1.29.1-gke.1388000

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1412001
  • 1.26.6-gke.1017002
  • 1.27.10-gke.1055001
  • 1.28.6-gke.1276000
  • 1.29.1-gke.1392000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-0193

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-0193

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-0193

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2024-0193

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-011

Published: 2024-02-15
Reference: CVE-2023-6932

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-6932

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.17-gke.2364001
  • 1.25.16-gke.1229000
  • 1.26.6-gke.1017002
  • 1.27.3-gke.1001003
  • 1.28.5-gke.1194000
  • 1.29.0-gke.1340000

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1412001
  • 1.26.6-gke.1017002
  • 1.27.10-gke.1055001
  • 1.28.6-gke.1276000
  • 1.29.1-gke.1221000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-6932

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-6932

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-6932

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes:

  • CVE-2023-6932

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-010

Published: 2024-02-14
Updated: 2024-04-17
Reference: CVE-2023-6931

2024-04-17 Update: Added patch versions for GKE on VMware.

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6931

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.17-gke.2364001
  • 1.25.16-gke.1229000
  • 1.26.6-gke.1017002
  • 1.27.3-gke.1001003
  • 1.28.5-gke.1194000
  • 1.29.0-gke.1340000

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1412001
  • 1.26.6-gke.1017002
  • 1.27.10-gke.1055001
  • 1.28.6-gke.1276000
  • 1.29.1-gke.1221000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Updated: 2024-04-17

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6931

What should I do?

2024-04-17 Update: Added patch versions for GKE on VMware.


The following versions of GKE on VMware are updated with code to fix this vulnerability. Upgrade your clusters to the following versions or later:

  • 1.28.200
  • 1.16.6
  • 1.15.10


Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6931

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6931

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6931

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-008

Published: 2024-02-12
Reference: CVE-2023-5528

GKE

Description Severity

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

GKE Standard clusters running Windows Server nodes and using an in-tree storage plugin might be affected.

GKE Autopilot clusters and GKE node pools using GKE Sandbox are not affected because they do not support Windows Server nodes.

What should I do?

Determine if you have Windows Server nodes in use on your clusters:

kubectl get nodes -l kubernetes.io/os=windows

Check audit logs for evidence of exploitation. Kubernetes audit logs can be audited to determine if this vulnerability is being exploited. Persistent Volume create events with local path fields containing special characters are a strong indication of exploitation.

Update your GKE cluster and node pools to a patched version. The following versions of GKE have been updated to fix this vulnerability. Even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and Windows Server node pools to one of the following GKE versions or later:

  • 1.24.17-gke.6100
  • 1.25.15-gke.2000
  • 1.26.10-gke.2000
  • 1.27.7-gke.2000
  • 1.28.3-gke.1600

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

What vulnerabilities are addressed by this patch?

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

High

GKE on VMware

Description Severity

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

GKE on VMware clusters running Windows Server nodes and using an in-tree storage plugin might be affected.

What should I do?

Determine if you have Windows Server nodes in use on your clusters:

kubectl get nodes -l kubernetes.io/os=windows

Check audit logs for evidence of exploitation. Kubernetes audit logs can be audited to determine if this vulnerability is being exploited. Persistent Volume create events with local path fields containing special characters are a strong indication of exploitation.

Update your GKE on VMware cluster and node pools to a patched version. The following versions of GKE on VMware have been updated to fix this vulnerability. Even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and Windows Server node pools to one of the following GKE on VMware versions or later:

  • 1.28.100-gke.131
  • 1.16.5-gke.28
  • 1.15.8-gke.41

What vulnerabilities are addressed by this patch?

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

High

GKE on AWS

Description Severity

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

GKE on AWS clusters aren't affected.

What should I do?

No action required

None

GKE on Azure

Description Severity

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

GKE on Azure clusters aren't affected.

What should I do?

No action required

None

GKE on Bare Metal

Description Severity

CVE-2023-5528 allows an attacker to create pods and persistent volumes on Windows nodes in a way that enables admin privilege escalation on those nodes.

GKE on Bare Metal clusters aren't affected.

What should I do?

No action required

None

GCP-2024-005

Published: 2024-01-31
Updated: 2024-05-06
Reference: CVE-2024-21626

2024-05-06 Update: Added patch versions for GKE on AWS and GKE on Azure.
2024-04-02 Update: Added patch versions for GKE on Bare Metal
2024-03-06 Update: Added patch versions for GKE on VMware
2024-02-28 Update: Added patch versions for Ubuntu
2024-02-15 Update: Clarified that the 1.25 and 1.26 Ubuntu patch versions in the 2024-02-14 update might cause unhealthy nodes.
2024-02-14 Update: Added patch versions for Ubuntu
2024-02-06 Update: Added patch versions for Container-Optimized OS.

GKE

Updated: 2024-03-06

Description Severity

A security vulnerability, CVE-2024-21626, has been discovered in runc where a user with permission to create Pods on Container-Optimized OS and Ubuntu nodes might be able to gain full access to the node filesystem.

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-02-28 Update: The following versions of GKE have been updated with code to fix this vulnerability in Ubuntu. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1537000
  • 1.26.14-gke.1006000

2024-02-15 Update: Due to an issue, the following Ubuntu patch versions from the 2024-02-14 update might cause your nodes to enter an unhealthy state. Don't upgrade to the following patch versions. We'll update this bulletin when newer patch versions for Ubuntu are available for 1.25 and 1.26.

  • 1.25.16-gke.1497000
  • 1.26.13-gke.1189000

If you already upgraded to one of these patch versions, manually downgrade your node pool to an earlier version in your release channel.


2024-02-14 Update: The following versions of GKE have been updated with code to fix this vulnerability in Ubuntu. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1497000
  • 1.26.13-gke.1189000
  • 1.27.10-gke.1207000
  • 1.28.6-gke.1369000
  • 1.29.1-gke.1575000

2024-02-06 Update: The following versions of GKE have been updated with code to fix this vulnerability in Container-Optimized OS. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and Container-Optimized OS node pools to one of the following GKE versions or later:

  • 1.25.16-gke.1460000
  • 1.26.13-gke.1144000
  • 1.27.10-gke.1152000
  • 1.28.6-gke.1289000
  • 1.29.1-gke.1425000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.


We're updating GKE with code to fix this vulnerability. We'll update this bulletin when patch versions are available.

What vulnerabilities are addressed by this patch?

runc is a low-level tool for spawning and running Linux containers used in Kubernetes Pods. In runc versions prior to the patches released in this security bulletin, several file descriptors were inadvertently leaked into the runc init process that runs within a container. runc also did not verify that a container's final working directory was inside the container's mount namespace. A malicious container image or a user with permission to run arbitrary Pods could use a combination of the leaked file descriptors and lack of working directory validation to gain access to a node's host mount namespace and access the entire host filesystem and overwrite arbitrary binaries on the node.

High

GKE on VMware

Updated: 2024-03-06

Description Severity

A security vulnerability, CVE-2024-21626, has been discovered in runc where a user with permission to create Pods on Container-Optimized OS and Ubuntu nodes might be able to gain full access to the node filesystem.

What should I do?

2024-03-06 Update: The following versions of GKE on VMware have been updated with code to fix this vulnerability. Upgrade your clusters to the following versions or later:

  • 1.28.200
  • 1.16.6
  • 1.15.9

Patch versions and a severity assessment for GKE on VMware are in progress. We'll update this bulletin with that information when it's available.

What vulnerabilities are addressed by this patch?

runc is a low-level tool for spawning and running Linux containers used in Kubernetes Pods. In runc versions prior to the patches released in this security bulletin, several file descriptors were inadvertently leaked into the runc init process that runs within a container. runc also did not verify that a container's final working directory was inside the container's mount namespace. A malicious container image or a user with permission to run arbitrary Pods could use a combination of the leaked file descriptors and lack of working directory validation to gain access to a node's host mount namespace and access the entire host filesystem and overwrite arbitrary binaries on the node.

High

GKE on AWS

Updated: 2024-05-06

Description Severity

A security vulnerability, CVE-2024-21626, has been discovered in runc where a user with permission to create Pods on Container-Optimized OS and Ubuntu nodes might be able to gain full access to the node filesystem.

What should I do?

2024-05-06 Update: The following versions of GKE on AWS have been updated with patches for CVE-2024-21626:

  • 1.28.5-gke.1200
  • 1.27.10-gke.500
  • 1.26.13-gke.400

Patch versions and a severity assessment for GKE on AWS are in progress. We'll update this bulletin with that information when it's available.

What vulnerabilities are addressed by this patch?

runc is a low-level tool for spawning and running Linux containers used in Kubernetes Pods. In runc versions prior to the patches released in this security bulletin, several file descriptors were inadvertently leaked into the runc init process that runs within a container. runc also did not verify that a container's final working directory was inside the container's mount namespace. A malicious container image or a user with permission to run arbitrary Pods could use a combination of the leaked file descriptors and lack of working directory validation to gain access to a node's host mount namespace and access the entire host filesystem and overwrite arbitrary binaries on the node.

High

GKE on Azure

Updated: 2024-05-06

Description Severity

A security vulnerability, CVE-2024-21626, has been discovered in runc where a user with permission to create Pods on Container-Optimized OS and Ubuntu nodes might be able to gain full access to the node filesystem.

What should I do?

2024-05-06 Update: The following versions of GKE on Azure have been updated with patches for CVE-2024-21626:

  • 1.28.5-gke.1200
  • 1.27.10-gke.500
  • 1.26.13-gke.400

Patch versions and a severity assessment for GKE on Azure are in progress. We'll update this bulletin with that information when it's available.

What vulnerabilities are addressed by this patch?

runc is a low-level tool for spawning and running Linux containers used in Kubernetes Pods. In runc versions prior to the patches released in this security bulletin, several file descriptors were inadvertently leaked into the runc init process that runs within a container. runc also did not verify that a container's final working directory was inside the container's mount namespace. A malicious container image or a user with permission to run arbitrary Pods could use a combination of the leaked file descriptors and lack of working directory validation to gain access to a node's host mount namespace and access the entire host filesystem and overwrite arbitrary binaries on the node.

High

GKE on Bare Metal

Updated: 2024-04-02

Description Severity

A security vulnerability, CVE-2024-21626, has been discovered in runc where a user with permission to create Pods might be able to gain full access to the node filesystem.

What should I do?

2024-04-02 Update: The following versions of GKE on Bare Metal have been updated with code to fix this vulnerability. Upgrade your clusters to the following versions or later:

  • 1.28.200-gke.118
  • 1.16.6
  • 1.15.10

Patch versions and a severity assessment for GKE on Bare Metal are in progress. We'll update this bulletin with that information when it's available.

What vulnerabilities are addressed by this patch?

runc is a low-level tool for spawning and running Linux containers used in Kubernetes Pods. In runc versions prior to the patches released in this security bulletin, several file descriptors were inadvertently leaked into the runc init process that runs within a container. runc also did not verify that a container's final working directory was inside the container's mount namespace. A malicious container image or a user with permission to run arbitrary Pods could use a combination of the leaked file descriptors and lack of working directory validation to gain access to a node's host mount namespace and access the entire host filesystem and overwrite arbitrary binaries on the node.

High

GCP-2024-004

Published: 2024-01-24
Updated: 2024-02-07
Reference: CVE-2023-6817

2024-02-07 Update: Added patch versions for Ubuntu.

GKE

Updated: 2024-02-07

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6817

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-02-07 Update: The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.25.16-gke.1458000
  • 1.26.13-gke.1143000
  • 1.27.10-gke.1152000
  • 1.28.6-gke.1276000
  • 1.29.1-gke.1221000

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.25.16-gke.1229000
  • 1.26.12-gke.1087000
  • 1.27.3-gke.1001003
  • 1.28.5-gke.1194000
  • 1.29.0-gke.1340000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6817

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6817

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6817

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-6817

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2024-003

Published: 2024-01-19
Updated: 2024-01-26
2024-01-26 Update: Clarified the number of affected clusters and the actions that we took to help mitigate the impact.

GKE

Updated: 2024-01-26

Description Severity

2024-01-26 Update: Security research that found a small number of GKE clusters with a customer-created misconfiguration involving the system:authenticated group has now been published. The researcher's blog post refers to 1,300 clusters with some misconfigured bindings, and 108 with high privileges. We have worked closely with impacted customers to notify them and assist with removing their misconfigured bindings.


We have identified several clusters where users have granted Kubernetes privileges to the system:authenticated group, which includes all users with a Google account. These types of bindings are not recommended, as they violate the principle of least privilege and grant access to very large groups of users. See guidance under 'What should I do' for instructions on how to find these types of bindings.

Recently, a security researcher reported findings of clusters with RBAC misconfigurations through our vulnerability reporting program.

Google's approach to authentication is to make authenticating to Google Cloud and GKE as simple and secure as possible without adding complex configuration steps. Authentication just tells us who the user is; Authorization is where access is determined. So the system:authenticated group in GKE that contains all users authenticated through Google's identity provider is working as intended and functions in the same way as the IAM allAuthenticatedUsers identifier.

With this in mind we've taken several steps to reduce the risk of users making authorization errors with the Kubernetes built-in users and groups, including system:anonymous, system:authenticated, and system:unauthenticated. All of these users/groups represent a risk to the cluster if granted permissions. We discussed some of the attacker activity targeting RBAC misconfigurations and available defenses at Kubecon in November 2023.

To protect users from accidental authorization errors with these system users/groups, we have:

  • By default blocked new bindings of the highly privileged ClusterRole cluster-admin to User system:anonymous, Group system:authenticated, or Group system:unauthenticated in GKE version 1.28.
  • Built detection rules into Event Threat Detection (GKE_CONTROL_PLANE_CREATE_SENSITIVE_BINDING) as part of Security Command Center.
  • Built configurable prevention rules into Policy Controller with K8sRestrictRoleBindings.
  • Sent email notifications to all GKE users with bindings to these users/groups asking them to review their configuration.
  • Built network authorization features and made recommendations to restrict network access to clusters as a first layer of defense.
  • Raised awareness about this issue through a talk at Kubecon in November 2023.

Clusters that apply authorized networks restrictions have a first layer of defense: they cannot be attacked directly from the Internet. But we still recommend removing these bindings for defense in depth and to guard against errors in network controls.
Note there are a number of cases where bindings to Kubernetes system users or groups are used intentionally: e.g. for kubeadm bootstrapping, the Rancher dashboard and Bitnami sealed secrets. We have confirmed with those software vendors that those bindings are working as intended.

We are investigating ways we can further protect against user RBAC misconfiguration with these system users/groups through prevention and detection.

What should I do?

To prevent any new bindings of cluster-admin to User system:anonymous, Group system:authenticated, or Group system:unauthenticated users can upgrade to GKE v1.28 or later (release notes), where creation of those bindings are blocked.

Existing bindings should be reviewed following this guidance.

Medium

GKE on VMware

No updates at this time.

GKE on AWS

No updates at this time.

GKE on Azure

No updates at this time.

GKE on Bare Metal

No updates at this time.

GCP-2024-002

Published: 2024-01-17
Updated: 2024-02-20
Reference: CVE-2023-6111

2024-02-20 Update: Added patch versions for GKE on VMware.

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes.

  • CVE-2023-6111

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.7-gke.1063001
  • 1.28.5-gke.1194000
  • 1.29.0-gke.1340000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Updated: 2024-02-20

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes.

  • CVE-2023-6111

What should I do?

2024-02-20 Update: The following versions of GKE on VMware are updated with code to fix this vulnerability. Upgrade your clusters to the following versions or later: 1.28.100


Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes.

  • CVE-2023-6111

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes.

  • CVE-2023-6111

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS nodes.

  • CVE-2023-6111

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-051

Published: 2023-12-28
Reference: CVE-2023-3609

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3609

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1014001
  • 1.27.3-gke.1001002
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.26.5-gke.1021001
  • 1.27.3-gke.1001002

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3609

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3609

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3609

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3609

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-050

Published: 2023-12-27
Reference: CVE-2023-3389

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3389

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1014001
  • 1.27.3-gke.1001002
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.10-gke.1027001
  • 1.26.5-gke.1014001
  • 1.27.3-gke.1001002
  • 1.28.1-gke.1002003

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3389

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3389

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3389

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3389

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-049

Published: 2023-12-20
Reference: CVE-2023-3090

GKE

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3090

GKE Standard clusters are impacted. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.12-gke.900
  • 1.26.5-gke.1014001
  • 1.27.4-gke.400
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.12-gke.900
  • 1.26.5-gke.1014001
  • 1.27.4-gke.900
  • 1.28.1-gke.1050000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3090

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3090

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3090

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3090

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-048

Published: 2023-12-15
Updated: 2023-12-21
Reference: CVE-2023-3390

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

GKE

Updated: 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3390

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.27.4-gke.400
  • 1.28.0-gke.100

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.14-gke.1027001
  • 1.25.12-gke.900
  • 1.26.5-gke.1014001
  • 1.27.4-gke.900
  • 1.28.1-gke.1050000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3390

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3390

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3390

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3390

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-047

Published: 2023-12-14

GKE

Description Severity

An attacker who has compromised the Fluent Bit logging container could combine that access with high privileges required by Anthos Service Mesh (on clusters that have enabled it) to escalate privileges in the cluster. The issues with Fluent Bit and Anthos Service Mesh have been mitigated and fixes are now available. These vulnerabilities are not exploitable on their own in GKE and require an initial compromise. We are not aware of any instances of exploitation of these vulnerabilities.

These issues were reported through our Vulnerability Reward Program.

What should I do?

The following versions of GKE have been updated with code to fix these vulnerabilities in Fluent Bit and for users of managed Anthos Service Mesh. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions or later:

  • 1.25.16-gke.1020000
  • 1.26.10-gke.1235000
  • 1.27.7-gke.1293000
  • 1.28.4-gke.1083000

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your specific release channel

If your cluster uses in-cluster Anthos Service Mesh, you must manually upgrade to one of the following versions (release notes):

  • 1.17.8-asm.8
  • 1.18.6-asm.2
  • 1.19.5-asm.4

What vulnerabilities are being addressed by this patch?

The vulnerabilities addressed by this bulletin require an attacker to compromise the Fluent Bit logging container. We are not aware of any existing vulnerabilities in Fluent Bit that would lead to this prerequisite condition for privilege escalation. We have patched these vulnerabilities as hardening measures to prevent a potential full attack chain in the future

GKE uses Fluent Bit to process logs for workloads running on clusters. Fluent Bit on GKE was also configured to collect logs for Cloud Run workloads. The volume mount configured to collect those logs gave Fluent Bit access to Kubernetes service account tokens for other Pods running on the node. The researcher used this access to discover a highly privileged service account token for clusters that have Anthos Service Mesh enabled.

Anthos Service Mesh required high privileges to make necessary modifications to a cluster's configuration including the ability to create and delete Pods. The researcher used Anthos Service Mesh's privileged Kubernetes service account token to escalate their initial compromised privileges by creating a new pod with cluster-admin privileges

We have removed Fluent Bit's access to the service account tokens and have redesigned the functionality of Anthos Service Mesh to remove excess privileges.

Medium

GKE on VMware

Description Severity

Only GKE on VMware clusters using Anthos Service Mesh are affected.

What should I do?

If your cluster uses in-cluster Anthos Service Mesh, you must manually upgrade to one of the following versions (release notes):

  • 1.17.8-asm.8
  • 1.18.6-asm.2
  • 1.19.5-asm.4

What vulnerabilities are addressed by this patch?

The vulnerabilities addressed by this bulletin require an attacker to first either compromise or otherwise break out of a container or have root on a cluster Node. We are not aware of any existing vulnerabilities that would lead to this prerequisite condition for privilege escalation. We have patched these vulnerabilities as hardening measures to prevent a potential full attack chain in the future.

Anthos Service Mesh required high privileges to make necessary modifications to a cluster's configuration including the ability to create and delete Pods. The researcher used Anthos Service Mesh's privileged Kubernetes service account token to escalate their initial compromised privileges by creating a new pod with cluster-admin privileges.

We have redesigned the functionality of Anthos Service Mesh to remove excessive privileges.

Medium

GKE on AWS

Description Severity

Only GKE on AWS clusters using Anthos Service Mesh are affected.

What should I do?

If your cluster uses in-cluster Anthos Service Mesh, you must manually upgrade to one of the following versions (release notes):

  • 1.17.8-asm.8
  • 1.18.6-asm.2
  • 1.19.5-asm.4

What vulnerabilities are addressed by this patch?

The vulnerabilities addressed by this bulletin require an attacker to first either compromise or otherwise break out of a container or have root on a cluster Node. We are not aware of any existing vulnerabilities that would lead to this prerequisite condition for privilege escalation. We have patched these vulnerabilities as hardening measures to prevent a potential full attack chain in the future.

Anthos Service Mesh required high privileges to make necessary modifications to a cluster's configuration including the ability to create and delete Pods. The researcher used Anthos Service Mesh's privileged Kubernetes service account token to escalate their initial compromised privileges by creating a new pod with cluster-admin privileges.

We have redesigned the functionality of Anthos Service Mesh to remove excessive privileges.

Medium

GKE on Azure

Description Severity

Only GKE on Azure clusters using Anthos Service Mesh are affected.

What should I do?

If your cluster uses in-cluster Anthos Service Mesh, you must manually upgrade to one of the following versions (release notes):

  • 1.17.8-asm.8
  • 1.18.6-asm.2
  • 1.19.5-asm.4

What vulnerabilities are addressed by this patch?

The vulnerabilities addressed by this bulletin require an attacker to first either compromise or otherwise break out of a container or have root on a cluster Node. We are not aware of any existing vulnerabilities that would lead to this prerequisite condition for privilege escalation. We have patched these vulnerabilities as hardening measures to prevent a potential full attack chain in the future.

Anthos Service Mesh required high privileges to make necessary modifications to a cluster's configuration including the ability to create and delete Pods. The researcher used Anthos Service Mesh's privileged Kubernetes service account token to escalate their initial compromised privileges by creating a new pod with cluster-admin privileges.

We have redesigned the functionality of Anthos Service Mesh to remove excessive privileges.

Medium

GKE on Bare Metal

Description Severity

Only GKE on Bare Metal clusters using Anthos Service Mesh are affected.

What should I do?

If your cluster uses in-cluster Anthos Service Mesh, you must manually upgrade to one of the following versions (release notes):

  • 1.17.8-asm.8
  • 1.18.6-asm.2
  • 1.19.5-asm.4

What vulnerabilities are addressed by this patch?

The vulnerabilities addressed by this bulletin require an attacker to first either compromise or otherwise break out of a container or have root on a cluster Node. We are not aware of any existing vulnerabilities that would lead to this prerequisite condition for privilege escalation. We have patched these vulnerabilities as hardening measures to prevent a potential full attack chain in the future.

Anthos Service Mesh required high privileges to make necessary modifications to a cluster's configuration including the ability to create and delete Pods. The researcher used Anthos Service Mesh's privileged Kubernetes service account token to escalate their initial compromised privileges by creating a new pod with cluster-admin privileges.

We have redesigned the functionality of Anthos Service Mesh to remove excessive privileges.

Medium

GCP-2023-046

Published: 2023-11-22
Updated: 2024-03-04
Reference: CVE-2023-5717

2024-03-04 Update: Added GKE versions for GKE on VMware.

2024-01-22 Update: Added Ubuntu patch versions.

GKE

Updated: 2024-01-22

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5717

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2024-01-22 Update: The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.17-gke.2472000
  • 1.25.16-gke.1268000
  • 1.26.12-gke.1111000
  • 1.27.9-gke.1092000
  • 1.28.5-gke.1217000
  • 1.29.0-gke.138100

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.24.17-gke.2113000
  • 1.25.14-gke.1421000
  • 1.25.15-gke.1083000
  • 1.26.10-gke.1073000
  • 1.27.7-gke.1088000
  • 1.28.3-gke.1203000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Updated: 2024-02-29

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5717

What should I do?

2024-03-04 Update: The following versions of GKE on VMware are updated with code to fix this vulnerability. Upgrade your clusters to the following versions or later:

  • 1.28.200
  • 1.16.5
  • 1.15.8
High

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5717

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5717

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5717

What should I do?

There is no action required. GKE on Bare Metal isn't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-045

Published: 2023-11-20
Updated: 2023-12-21
Reference: CVE-2023-5197

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

GKE

Updated: 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5197

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

GKE Standard and Autopilot clusters are impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

The following minor versions are affected. Upgrade your Container-Optimized OS node pools to one of the following patch versions or later:

  • 1.25.13-gke.1002003
  • 1.26.9-gke.1514000
  • 1.27.6-gke.1513000
  • 1.28.2-gke.1164000

The following minor versions are affected. Upgrade your Ubuntu node pools to one of the following patch versions or later:

  • 1.24.16-gke.1005001
  • 1.25.13-gke.1002003
  • 1.26.9-gke.1548000
  • 1.27.7-gke.1039000
  • 1.28.3-gke.1061000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patch version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5197

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5197

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5197

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-5197

What should I do?

There is no action required. GKE on Bare Metal aren't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-042

Published: 2023-11-13
Updated: 2023-11-15
Reference: CVE-2023-4147

2023-11-15 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patched version for GKE.

GKE

Updated: 2023-11-15

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4147

GKE Standard clusters are impacted. GKE Autopilot clusters aren't impacted.

Clusters using GKE Sandbox aren't impacted.

What should I do?

2023-11-15 Update: You only need to upgrade to one of the patched versions that are listed in this bulletin if you use that minor version in your nodes. For example, if you use GKE version 1.27, you should upgrade to the corresponding patched version. However, if you use GKE version 1.24, you don't need to upgrade to a patched version.


Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.27.5-gke.200
  • 1.28.2-gke.1157000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.25.14-gke.1421000
  • 1.26.9-gke.1437000
  • 1.27.6-gke.1248000
  • 1.28.2-gke.1157000

You can apply patch versions from newer release channels if your cluster runs the same minor version in its own release channel. This feature lets you secure your nodes until the patched version becomes the default in your release channel. For details, see Run patch versions from a newer channel.

High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4147

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4147

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4147

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4147

What should I do?

There is no action required. GKE on Bare Metal aren't affected as it does not bundle an operating system in its distribution.

None

GCP-2023-041

Published: 2023-11-08
Updated: 2023-11-21, 2023-12-05, 2023-12-21
Reference: CVE-2023-4004

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

2023-12-05 Update: Added additional GKE versions for Container-Optimized OS node pools.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-05, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4004

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-12-05 Update: Some GKE versions were previously missing. The following is an updated list of GKE versions that you can update your Container-Optimized OS to:

  • 1.24.17-gke.200 or later
  • 1.25.13-gke.200 or later
  • 1.26.8-gke.200 or later
  • 1.27.4-gke.2300 or later
  • 1.28.1-gke.1257000 or later

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.27.4-gke.2300
  • 1.28.1-gke.1257000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.13-gke.700
  • 1.26.8-gke.700
  • 1.27.5-gke.700
  • 1.28.1-gke.1050000
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4004

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4004

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4004

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4004

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

None

GCP-2023-040

Published: 2023-11-06
Updated: 2023-11-21, 2023-12-21
Reference: CVE-2023-4921

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4921

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.14-gke.1351000
  • 1.26.9-gke.1345000
  • 1.27.6-gke.1389000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.17-gke.2186000
  • 1.25.15-gke.1016000
  • 1.26.9-gke.1548000
  • 1.27.6-gke.1551000
  • 1.28.2-gke.1256000
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4921

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4921

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4921

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4921

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

None

GCP-2023-039

Published: 2023-11-06
Updated: 2023-11-21, 2023-11-16
Reference: CVE-2023-4622

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

2023-11-16 Update: The vulnerability associated with this security bulletin is CVE-2023-4622. CVE-2023-4623 was incorrectly listed as the vulnerability in a previous version of the security bulletin.

GKE

Updated: 2023-11-21, 2023-11-16

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.14-gke.1351000
  • 1.26.9-gke.1345000
  • 1.27.5-gke.1647000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.17-gke.2186000
  • 1.25.15-gke.1016000
  • 1.26.9-gke.1548000
  • 1.27.6-gke.1551000
  • 1.28.2-gke.1256000
High

GKE on VMware

Updated: 2023-11-16

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on AWS

Updated: 2023-11-16

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on Azure

Updated: 2023-11-16

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on Bare Metal

Updated: 2023-11-16

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

None

GCP-2023-038

Published: 2023-11-06
Updated: 2023-11-21, 2023-12-21
Reference: CVE-2023-4623

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.14-gke.1351000
  • 1.26.9-gke.1345000
  • 1.27.6-gke.1389000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.17-gke.2186000
  • 1.25.15-gke.1016000
  • 1.26.9-gke.1548000
  • 1.27.6-gke.1551000
  • 1.28.2-gke.1256000
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4623

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

None

GCP-2023-037

Published: 2023-11-06
Updated: 2023-11-21, 2023-12-21
Reference: CVE-2023-4015

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4015

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.27.5-gke.1647000

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.13-gke.700
  • 1.26.8-gke.700
  • 1.27.5-gke.700
  • 1.28.1-gke.1050000
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4015

What should I do?

Pending

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4015

What should I do?

Pending

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4015

What should I do?

Pending

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4015

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

None

GCP-2023-035

Published: 2023-10-26
Updated: 2023-11-21, 2023-12-21
Reference: CVE-2023-4206, CVE-2023-4207, CVE-2023-4208, CVE-2023-4128

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4206
  • CVE-2023-4207
  • CVE-2023-4208
  • CVE-2023-4128

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

Autopilot clusters are impacted.

Clusters using GKE Sandbox are not impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.13-gke.1008000
  • 1.26.8-gke.1647000
  • 1.27.5-gke.200

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.14-gke.1027001
  • 1.25.13-gke.1706000
  • 1.26.8-gke.1647000
  • 1.27.5-gke.1648000
  • 1.28.1-gke.1050000
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4206
  • CVE-2023-4207
  • CVE-2023-4208
  • CVE-2023-4128

What should I do?

High

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4206
  • CVE-2023-4207
  • CVE-2023-4208
  • CVE-2023-4128

What should I do?

High

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4206
  • CVE-2023-4207
  • CVE-2023-4208
  • CVE-2023-4128

What should I do?

High

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-4206
  • CVE-2023-4207
  • CVE-2023-4208
  • CVE-2023-4128

What should I do?

There is no action required. GKE on Bare Metal are not affected as it does not bundle an operating system in its distribution.

High

GCP-2023-033

Published: 2023-10-24
Updated: 2023-11-21, 2023-12-21
Reference: CVE-2023-3777

2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted and GKE Sandbox workloads are not impacted.

2023-11-21 Update: Clarify that only the listed minor versions need to upgrade to a corresponding patch version for GKE.

GKE

Updated: 2023-11-21, 2023-12-21

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3777

2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN. GKE Sandbox workloads are also not impacted.

Autopilot clusters are impacted.

Clusters that use GKE Sandbox are impacted.

What should I do?

2023-11-21 Update: You only need to upgrade to one of the patch versions that are listed in this bulletin if you use that minor version in your nodes. Minor versions that aren't listed aren't impacted.

Upgrade your Container-Optimized OS node pools to one of the following versions or later:

  • 1.24.16-gke.2200
  • 1.25.12-gke.2200
  • 1.26.7-gke.2200
  • 1.27.4-gke.2300

Upgrade your Ubuntu node pools to one of the following versions or later:

  • 1.24.17-gke.700
  • 1.25.13-gke.700
  • 1.26.8-gke.700
  • 1.27.5-gke.700
  • 1.28.0-gke.100
High

GKE on VMware

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3777

What should I do?

GKE on AWS

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3777

What should I do?

GKE on Azure

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3777

What should I do?

GKE on Bare Metal

Description Severity

The following vulnerabilities were discovered in the Linux kernel that can lead to a privilege escalation on Container-Optimized OS and Ubuntu nodes.

  • CVE-2023-3777

What should I do?

There is no action required. GKE on Bare Metal is not affected as it does not bundle an operating system in its distribution.

GCP-2023-030

Published: 2023-10-10
Updated: 2024-03-20
Reference: CVE-2023-44487CVE-2023-39325

2024-03-20 Update: Added patch versions for GKE on AWS and GKE on Azure
2024-02-14 Update: Added patch versions for GKE on VMware
2023-11-09 Update: Added CVE-2023-39325. Updated GKE versions with the latest patches for CVE-2023-44487 and CVE-2023-39325.

GKE

Updated: 2023-11-09

Description Severity

A Denial-of-Service (DoS) vulnerability was recently discovered in multiple implementations of the HTTP/2 protocol (CVE-2023-44487), including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Google Kubernetes Engine (GKE) control plane. GKE clusters with authorized networks configured are protected by limiting network access, but all other clusters are affected.

What should I do?

2023-11-09 Update: We have released new versions of GKE that include the Go and Kubernetes security patches, which you can update your clusters to now. In the coming weeks we will release additional changes to the GKE control plane to further mitigate this issue.

The following GKE versions have been updated with patches for CVE-2023-44487 and CVE-2023-39325:

  • 1.24.17-gke.2155000
  • 1.25.14-gke.1474000
  • 1.26.10-gke.1024000
  • 1.27.7-gke.1038000
  • 1.28.3-gke.1090000

We recommend that you apply the following mitigation as soon as possible and upgrade to the latest patched version when available.

Golang patches will be released on October 10. Once available, we will build and qualify a new Kubernetes API server with those patches and make a GKE patched release. Once the GKE release is available, we will update this bulletin with guidance on which version to upgrade your control plane, and also make the patches visible within GKE security posture when available for your cluster. To receive a Pub/Sub notification when a patch is available for your channel, enable cluster notifications.

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

Mitigate by configuring authorized networks for control plane access:

You can add authorized networks for existing clusters. To learn more see, authorized network for existing clusters.

In addition to the authorized networks you add, there are preset IP addresses that can access the GKE control plane. To learn more about these addresses, see Access to control plane endpoints. The following items summarize the cluster isolation:

  • Private clusters with --master-authorized-networks and PSC-based clusters with --master-authorized-networks and --no-enable-google-cloud configured are the most isolated.
  • Legacy public clusters with --master-authorized-networks and PSC-based clusters with --master-authorized-networks and --enable-google-cloud (default) configured are additionally accessible by the following:
    • Public IP addresses of all Compute Engine VMs in Google Cloud
    • Google Cloud platform IP addresses

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-44487, allows an attacker to execute a denial-of-service attack on GKE control plane nodes.

High

GKE on VMware

Updated: 2024-02-14

Description Severity

A Denial-of-Service (DoS) vulnerability was recently discovered in multiple implementations of the HTTP/2 protocol (CVE-2023-44487), including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Kubernetes control plane. GKE on VMware creates Kubernetes clusters that are not directly accessible to the Internet by default and are protected from this vulnerability.

What should I do?

2024-02-14 Update: The following versions of GKE on VMware are updated with code to fix this vulnerability. Upgrade your clusters to the following patch versions or later:

  • 1.28.100
  • 1.16.6
  • 1.15.8

If you have configured your GKE on VMware Kubernetes clusters to have direct access to the Internet or other untrusted networks, we recommend working with your firewall administrator to block or limit that access.

We recommend that you upgrade to the latest patch version, when available, as soon as possible.

Golang patches will be released on October 10. Once available, we will build and qualify a new Kubernetes API server with those patches and make a GKE patched release. Once the GKE release is available, we will update this bulletin with guidance on which version to upgrade your control plane to.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-44487, allows an attacker to execute a denial-of-service attack on Kubernetes control plane nodes.

High

GKE on AWS

Description Severity

A Denial-of-Service (DoS) vulnerability was recently discovered in multiple implementations of the HTTP/2 protocol (CVE-2023-44487), including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Kubernetes control plane. GKE on AWS creates private Kubernetes clusters that are not directly accessible to the Internet by default and are protected from this vulnerability.

What should I do?

2024-03-20 Update: The following GKE on AWS versions have been updated with patches for CVE-2023-44487:

  • 1.26.10-gke.600
  • 1.27.7-gke.600
  • 1.28.3-gke.700

If you have configured your GKE on AWS to have direct access to the Internet or other untrusted networks, we recommend working with your firewall administrator to block or limit that access.

We recommend that you upgrade to the latest patch version, when available, as soon as possible.

Golang patches will be released on October 10. Once available, we will build and qualify a new Kubernetes API server with those patches and make a GKE patched release. Once the GKE release is available, we will update this bulletin with guidance on which version to upgrade your control plane to.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-44487, allows an attacker to execute a denial-of-service attack on Kubernetes control plane nodes.

High

GKE on Azure

Description Severity

A Denial-of-Service (DoS) vulnerability was recently discovered in multiple implementations of the HTTP/2 protocol (CVE-2023-44487), including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Kubernetes control plane. GKE on Azure creates private Kubernetes clusters that are not directly accessible to the Internet by default and are protected from this vulnerability.

What should I do?

2024-03-20 Update: The following GKE on Azure versions have been updated with patches for CVE-2023-44487:

  • 1.26.10-gke.600
  • 1.27.7-gke.600
  • 1.28.3-gke.700

If you have configured your GKE on Azure clusters to have direct access to the Internet or other untrusted networks, we recommend working with your firewall administrator to block or limit that access.

We recommend that you upgrade to the latest patch version, when available, as soon as possible.

Golang patches will be released on October 10. Once available, we will build and qualify a new Kubernetes API server with those patches and make a GKE patched release. Once the GKE release is available, we will update this bulletin with guidance on which version to upgrade your control plane to.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-44487, allows an attacker to execute a denial-of-service attack on Kubernetes control plane nodes.

High

GKE on Bare Metal

Description Severity

A Denial-of-Service (DoS) vulnerability was recently discovered in multiple implementations of the HTTP/2 protocol (CVE-2023-44487), including the golang HTTP server used by Kubernetes. The vulnerability could lead to a DoS of the Kubernetes control plane. Anthos on Bare Metal creates Kubernetes clusters that are not directly accessible to the Internet by default and are protected from this vulnerability.

What should I do?

If you have configured your Anthos on Bare Metal Kubernetes clusters to have direct access to the Internet or other untrusted networks, we recommend working with your firewall administrator to block or limit that access. To learn more, see the GKE on Bare Metal security overview.

We recommend that you upgrade to the latest patch version, when available, as soon as possible.

Golang patches will be released on October 10. Once available, we will build and qualify a new Kubernetes API server with those patches and make a GKE patched release. Once the GKE release is available, we will update this bulletin with guidance on which version to upgrade your control plane to.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-44487, allows an attacker to execute a denial-of-service attack on Kubernetes control plane nodes.

High

GCP-2023-026

Published: 2023-09-06
Reference: CVE-2023-3676, CVE-2023-3955, CVE-2023-3893

GKE

Description Severity

Three vulnerabilities (CVE-2023-3676, CVE-2023-3955, CVE-2023-3893) have been discovered in Kubernetes where a user that can create Pods on Windows nodes may be able to escalate to admin privileges on those nodes. These vulnerabilities affect the Windows versions of Kubelet and the Kubernetes CSI proxy.

GKE clusters are only affected if they include Windows nodes.

What should I do?

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.24.17-gke.200
  • 1.25.13-gke.200
  • 1.26.8-gke.200
  • 1.27.5-gke.200
  • 1.28.1-gke.200

The GKE control plane will be updated the week of 2023-09-04 to update the csi-proxy to version 1.1.3. If you update your nodes prior to the control plane update, you will need to update your nodes again after the update to take advantage of the new proxy. You can update the nodes again, even without changing the node version, by running the gcloud container clusters upgrade command and passing the --cluster-version flag with the same GKE version that the node pool is already running. You must use the gcloud CLI for this workaround. Note that this will cause an update regardless of maintenance windows.

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your specific release channel.

What vulnerabilities are addressed by this patch?

With CVE-2023-3676, a malicious actor could craft a Pod spec with host path strings that contain PowerShell commands. Kubelet lacks input sanitization and passes this crafted path string to the command executor as an argument where it would execute parts of the string as separate commands. These commands would run with the same administrative privileges as Kubelet has.

With CVE-2023-3955, Kubelet grants users who can create Pods the ability to execute code at the same permission level as the Kubelet agent, privileged permissions.

With CVE-2023-3893, a similar lack of input sanitation lets a user who can create Pods on Windows nodes running kubernetes-csi-proxy to escalate to admin privileges on those nodes.

Kubernetes audit logs can be used to detect if this vulnerability is being exploited. Pod create events with embedded PowerShell commands are a strong indication of exploitation. ConfigMaps and Secrets that contain embedded PowerShell commands and are mounted into Pods are also a strong indication of exploitation.

High

GKE on VMware

Description Severity

Three vulnerabilities (CVE-2023-3676, CVE-2023-3955, CVE-2023-3893) have been discovered in Kubernetes where a user that can create Pods on Windows nodes may be able to escalate to admin privileges on those nodes. These vulnerabilities affect the Windows versions of Kubelet and the Kubernetes CSI proxy.

Clusters are only affected if they include Windows nodes.

What should I do?

What vulnerabilities are addressed by this patch?

With CVE-2023-3676, a malicious actor could craft a Pod spec with host path strings that contain PowerShell commands. Kubelet lacks input sanitization and passes this crafted path string to the command executor as an argument where it would execute parts of the string as separate commands. These commands would run with the same administrative privileges as Kubelet has.

With CVE-2023-3955, Kubelet grants users who can create Pods the ability to execute code at the same permission level as the Kubelet agent, privileged permissions.

With CVE-2023-3893, a similar lack of input sanitation lets a user who can create Pods on Windows nodes running kubernetes-csi-proxy to escalate to admin privileges on those nodes.

Kubernetes audit logs can be used to detect if this vulnerability is being exploited. Pod create events with embedded PowerShell commands are a strong indication of exploitation. ConfigMaps and Secrets that contain embedded PowerShell commands and are mounted into Pods are also a strong indication of exploitation.

High

GKE on AWS

Description Severity

Three vulnerabilities (CVE-2023-3676, CVE-2023-3955, CVE-2023-3893) have been discovered in Kubernetes where a user that can create Pods on Windows nodes may be able to escalate to admin privileges on those nodes. These vulnerabilities affect the Windows versions of Kubelet and the Kubernetes CSI proxy.

What should I do?

GKE on AWS is not affected by these CVEs. No action is required.

None

GKE on Azure

Description Severity

Three vulnerabilities (CVE-2023-3676, CVE-2023-3955, CVE-2023-3893) have been discovered in Kubernetes where a user that can create Pods on Windows nodes may be able to escalate to admin privileges on those nodes. These vulnerabilities affect the Windows versions of Kubelet and the Kubernetes CSI proxy.

What should I do?

GKE on Azure is not affected by these CVEs. No action is required.

None

GKE on Bare Metal

Description Severity

Three vulnerabilities (CVE-2023-3676, CVE-2023-3955, CVE-2023-3893) have been discovered in Kubernetes where a user that can create Pods on Windows nodes may be able to escalate to admin privileges on those nodes. These vulnerabilities affect the Windows versions of Kubelet and the Kubernetes CSI proxy.

What should I do?

GKE on Bare Metal is not affected by these CVEs. No action is required.

None

GCP-2023-018

Published: 2023-06-27
Reference: CVE-2023-2235

GKE

Description Severity

A new vulnerability (CVE-2023-2235) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE Autopilot clusters are affected as GKE Autopilot nodes always use Container-Optimized OS node images. GKE Standard clusters with versions 1.25 or later that are running Container-Optimized OS node images are affected.

GKE clusters are not affected if they are running only Ubuntu node images, or running versions before 1.25, or using GKE Sandbox.

What should I do?

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.25.9-gke.1400
  • 1.26.4-gke.1500
  • 1.27.1-gke.2400

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

What vulnerabilities are being addressed?

With CVE-2023-2235, the perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

High

GKE on VMware

Description Severity

A new vulnerability (CVE-2023-2235) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on VMware clusters are affected.

What should I do?

What vulnerabilities are being addressed?

With CVE-2023-2235, the perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

High

GKE on AWS

Description Severity

A new vulnerability (CVE-2023-2235) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on AWS clusters are affected.

What should I do?

What vulnerabilities are addressed by this patch?

With CVE-2023-2235, the perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

High

GKE on Azure

Description Severity

A new vulnerability (CVE-2023-2235) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on Azure clusters are affected.

What should I do?

What vulnerabilities are addressed by this patch?

With CVE-2023-2235, the perf_group_detach function did not check the event's siblings' attach_state before calling add_event_to_groups(), but remove_on_exec made it possible to call list_del_event() on before detaching from their group, making it possible to use a dangling pointer causing a use-after-free vulnerability.

High

GKE on Bare Metal

Description Severity

A new vulnerability (CVE-2023-2235) has been discovered in the Linux kernel that can lead to a privilege escalation on the node.

Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE.

What should I do?

No action is required.

None

GCP-2023-017

Published: 2023-06-26
Updated: 2023-07-11
Reference: CVE-2023-31436

2023-07-11 Update: New GKE versions have been updated to include the latest Ubuntu versions that patch CVE-2023-31436.

GKE

Updated: 2023-07-11

Description Severity

A new vulnerability (CVE-2023-31436) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE clusters, including Autopilot clusters, are affected.

GKE clusters using GKE Sandbox are not affected.

What should I do?

2023-07-11 Update: Ubuntu patch versions are available.

The following GKE versions have been updated to include the latest Ubuntu versions that patch CVE-2023-31436:

  • 1.23.17-gke.8200
  • 1.24.14-gke.2600
  • 1.25.10-gke.2700
  • 1.26.5-gke.2700
  • 1.27.2-gke.2700

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.22.17-gke.11400
  • 1.23.17-gke.6800
  • 1.24.14-gke.1200
  • 1.25.10-gke.1200
  • 1.26.5-gke.1200
  • 1.27.2-gke.1200

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

What vulnerabilities are being addressed?

With CVE-2023-31436, an out-of-bounds memory access flaw was found in the Linux kernel's traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.

High

GKE on VMware

Description Severity

A new vulnerability (CVE-2023-31436) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on VMware clusters are affected.

What should I do?

What vulnerabilities are being addressed?

With CVE-2023-31436, an out-of-bounds memory access flaw was found in the Linux kernel's traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.

High

GKE on AWS

Description Severity

A new vulnerability (CVE-2023-31436) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on AWS clusters are affected.

What should I do?

What vulnerabilities are addressed by this patch?

With CVE-2023-31436, an out-of-bounds memory access flaw was found in the Linux kernel's traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.

High

GKE on Azure

Description Severity

A new vulnerability (CVE-2023-31436) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on Azure clusters are affected.

What should I do?

What vulnerabilities are addressed by this patch?

With CVE-2023-31436, an out-of-bounds memory access flaw was found in the Linux kernel's traffic control (QoS) subsystem in how a user triggers the qfq_change_class function with an incorrect MTU value of the network device used as lmax. This flaw allows a local user to crash or potentially escalate their privileges on the system.

High

GKE on Bare Metal

Description Severity

A new vulnerability (CVE-2023-31436) has been discovered in the Linux kernel that can lead to a privilege escalation on the node.

Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE.

What should I do?

No action is required.

None

GCP-2023-016

Published: 2023-06-26
Reference: CVE-2023-27496, CVE-2023-27488, CVE-2023-27493, CVE-2023-27492, CVE-2023-27491, CVE-2023-27487

GKE

Description Severity

A number of vulnerabilities have been discovered in Envoy, which is used in Anthos Service Mesh (ASM). These were reported separately as GCP-2023-002.

GKE does not ship with ASM and is not affected by these vulnerabilities.

What should I do?

If you have separately installed ASM for your GKE clusters, please see GCP-2023-002.

None

GKE on VMware

Description Severity

A number of vulnerabilities (CVE-2023-27496, CVE-2023-27488, CVE-2023-27493, CVE-2023-27492, CVE-2023-27491, CVE-2023-27487), have been discovered in Envoy, which is used in Anthos Service Mesh in GKE on VMware, that allows a malicious attacker to cause a denial of service or crash Envoy. These were reported separately as GCP-2023-002, but we want to ensure that GKE Enterprise customers update their versions that include ASM.

What should I do?

The following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to one of the following GKE on VMware versions:

  • 1.13.8
  • 1.14.5
  • 1.15.1

What vulnerabilities are addressed by this patch?

CVE-2023-27496: If Envoy is running with the OAuth filter enabled exposed, a malicious actor could construct a request which would cause denial of service by crashing Envoy.

CVE-2023-27488: Attackers can use this vulnerability to bypass auth checks when ext_authz is used.

CVE-2023-27493: Envoy configuration must also include an option to add request headers that were generated using inputs from the request, such as the peer certificate SAN.

CVE-2023-27492: Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes.

CVE-2023-27491: Attackers can send specifically crafted HTTP/2 or HTTP/3 requests to trigger parsing errors on HTTP/1 upstream service.

CVE-2023-27487: The header x-envoy-original-path should be an internal header, but Envoy does not remove this header from the request at the beginning of request processing when it is sent from an untrusted client.

High

GKE on AWS

Description Severity

A number of vulnerabilities (CVE-2023-27496, CVE-2023-27488, CVE-2023-27493, CVE-2023-27492, CVE-2023-27491, CVE-2023-27487), have been discovered in Envoy, which is used in Anthos Service Mesh. These were reported separately as GCP-2023-002.

GKE on AWS does not ship with ASM and is not affected.

What should I do?

No action is required.

None

GKE on Azure

Description Severity

A number of vulnerabilities (CVE-2023-27496, CVE-2023-27488, CVE-2023-27493, CVE-2023-27492, CVE-2023-27491, CVE-2023-27487), have been discovered in Envoy, which is used in Anthos Service Mesh. These were reported separately as GCP-2023-002.

GKE on Azure does not ship with ASM and is not affected.

What should I do?

No action is required.

None

GKE on Bare Metal

Description Severity

A number of vulnerabilities (CVE-2023-27496, CVE-2023-27488, CVE-2023-27493, CVE-2023-27492, CVE-2023-27491, CVE-2023-27487), have been discovered in Envoy, which is used in Anthos Service Mesh in GKE on Bare Metal, that allows a malicious attacker to cause a denial of service or crash Envoy. These were reported separately as GCP-2023-002, but we want to ensure that GKE Enterprise customers update their versions that include ASM.

What should I do?

The following versions of GKE on Bare Metal have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to one of the following GKE on Bare Metal versions:

  • 1.13.9
  • 1.14.6
  • 1.15.2

What vulnerabilities are addressed by this patch?

CVE-2023-27496: If Envoy is running with the OAuth filter enabled exposed, a malicious actor could construct a request which would cause denial of service by crashing Envoy.

CVE-2023-27488: Attackers can use this vulnerability to bypass auth checks when ext_authz is used.

CVE-2023-27493: Envoy configuration must also include an option to add request headers that were generated using inputs from the request, such as the peer certificate SAN.

CVE-2023-27492: Attackers can send large request bodies for routes that have Lua filter enabled and trigger crashes.

CVE-2023-27491: Attackers can send specifically crafted HTTP/2 or HTTP/3 requests to trigger parsing errors on HTTP/1 upstream service.

CVE-2023-27487: The header x-envoy-original-path should be an internal header, but Envoy does not remove this header from the request at the beginning of request processing when it is sent from an untrusted client.

High

GCP-2023-015

Published: 2023-06-20
Reference: CVE-2023-0468

GKE

Description Severity

A new vulnerability (CVE-2023-0468) has been discovered in version 5.15 of the Linux kernel that can lead to a denial of service on the node. GKE clusters, including Autopilot clusters, are affected.

GKE clusters using GKE Sandbox are not affected.

What should I do?

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.25.7-gke.1200
  • 1.26.2-gke.1200

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

What vulnerabilities are being addressed?

In CVE-2023-0468, a use-after-free flaw was found in io_uring/poll.c in io_poll_check_events in the io_uring subcomponent in the Linux Kernel. This flaw may cause a NULL pointer dereference, and potentially a system crash leading to a denial of service.

Medium

GKE on VMware

Description Severity

A new vulnerability (CVE-2023-0468) has been discovered in version 5.15 of the Linux kernel that can lead to a denial of service on the node.

GKE on VMware uses version 5.4 of the Linux Kernel and is not affected by this CVE.

What should I do?

  • No action is needed
None

GKE on AWS

Description Severity

A new vulnerability (CVE-2023-0468) has been discovered in version 5.15 of the Linux kernel that can lead to a denial of service on the node.

GKE on AWS is not affected by this CVE.

What should I do?

  • No action is needed
None

GKE on Azure

Description Severity

A new vulnerability (CVE-2023-0468) has been discovered in version 5.15 of the Linux kernel that can lead to a denial of service on the node.

GKE on Azure is not affected by this CVE.

What should I do?

  • No action is needed
None

GKE on Bare Metal

Description Severity

A new vulnerability (CVE-2023-0468) has been discovered in version 5.15 of the Linux kernel that can lead to a denial of service on the node.

Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE.

What should I do?

  • No action is needed
None

GCP-2023-014

Published: 2023-06-15
Updated: 2023-08-11
Reference: CVE-2023-2727, CVE-2023-2728

2023-08-11 Update: Added patch versions for GKE on VMware, GKE on AWS, GKE on Azure, and GKE on Bare Metal

GKE

Description Severity

Two new security issues were discovered in Kubernetes where users may be able to launch containers that bypass policy restrictions when using ephemeral containers and either ImagePolicyWebhook (CVE-2023-2727) or the ServiceAccount admission plugin (CVE-2023-2728).

GKE does not use ImagePolicyWebhook and is not affected by CVE-2023-2727.

All versions of GKE are potentially vulnerable to CVE-2023-2728.

What should I do?

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.27.2-gke.1200
  • 1.26.5-gke.1200
  • 1.25.10-gke.1200
  • 1.24.14-gke.1200
  • 1.23.17-gke.6800

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your specific release channel.

What vulnerabilities are being addressed?

With CVE-2023-2727, users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers. This CVE can also be mitigated by using validation webhooks, such as Gatekeeper and Kyverno, to enforce the same restrictions.

In CVE-2023-2728, users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures that Pods running with a service account may only reference secrets specified in the service account's secrets field. Clusters are impacted by this vulnerability if:

  • The ServiceAccount admission plugin is used.
  • The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default.
  • Pods are using ephemeral containers.
Medium

GKE on VMware

Updated: 2023-08-11

Description Severity

Two new security issues were discovered in Kubernetes where users may be able to launch containers that bypass policy restrictions when using ephemeral containers and either ImagePolicyWebhook (CVE-2023-2727) or the ServiceAccount admission plugin (CVE-2023-2728) Anthos on VMware does not use ImagePolicyWebhook and is not affected by CVE-2023-2727.

All versions of Anthos on VMware are potentially vulnerable to CVE-2023-2728.

What should I do?

2023-08-11 Update: The following versions of GKE on VMware have been updated with code to fix this vulnerability. Upgrade your admin and user clusters to one of the following GKE on VMware versions:

  • 1.13.10
  • 1.14.6
  • 1.15.3

What vulnerabilities are being addressed?

With CVE-2023-2727, users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers. This CVE can also be mitigated by using validation webhooks, such as Gatekeeper and Kyverno, to enforce the same restrictions.

In CVE-2023-2728, users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures that Pods running with a service account may only reference secrets specified in the service account's secrets field. Clusters are impacted by this vulnerability if:

  • The ServiceAccount admission plugin is used.
  • The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default.
  • Pods are using ephemeral containers.
Medium

GKE on AWS

Updated: 2023-08-11

Description Severity

Two new security issues were discovered in Kubernetes where users may be able to launch containers that bypass policy restrictions when using ephemeral containers and either ImagePolicyWebhook (CVE-2023-2727) or the ServiceAccount admission plugin (CVE-2023-2728)
Anthos on AWS does not use ImagePolicyWebhook and is not affected by CVE-2023-2727.
All versions of Anthos on AWS are potentially vulnerable to CVE-2023-2728.

What should I do?

2023-08-11 Update: The following version of GKE on AWS has been updated with code to fix this vulnerability. Upgrade your nodes to the following GKE on AWS version:

  • 1.15.2

What vulnerabilities are being addressed?

With CVE-2023-2727, users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers. This CVE can also be mitigated by using validation webhooks, such as Gatekeeper and Kyverno, to enforce the same restrictions.

In CVE-2023-2728, users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures that Pods running with a service account may only reference secrets specified in the service account's secrets field. Clusters are impacted by this vulnerability if:

  • The ServiceAccount admission plugin is used.
  • The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default.
  • Pods are using ephemeral containers.
Medium

GKE on Azure

Updated: 2023-08-11

Description Severity

Two new security issues were discovered in Kubernetes where users may be able to launch containers that bypass policy restrictions when using ephemeral containers and either ImagePolicyWebhook (CVE-2023-2727) or the ServiceAccount admission plugin (CVE-2023-2728)
Anthos on Azure does not use ImagePolicyWebhook and is not affected by CVE-2023-2727.
All versions of Anthos on Azure are potentially vulnerable to CVE-2023-2728.

What should I do?

2023-08-11 Update: The following version of GKE on Azure has been updated with code to fix this vulnerability. Upgrade your nodes to the following GKE on Azure version:

  • 1.15.2

What vulnerabilities are being addressed?

With CVE-2023-2727, users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers. This CVE can also be mitigated by using validation webhooks, such as Gatekeeper and Kyverno, to enforce the same restrictions.

In CVE-2023-2728, users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures that Pods running with a service account may only reference secrets specified in the service account's secrets field. Clusters are impacted by this vulnerability if:

  • The ServiceAccount admission plugin is used.
  • The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default.
  • Pods are using ephemeral containers.
Medium

GKE on Bare Metal

Updated: 2023-08-11

Description Severity

Two new security issues were discovered in Kubernetes where users may be able to launch containers that bypass policy restrictions when using ephemeral containers and either ImagePolicyWebhook (CVE-2023-2727) or the ServiceAccount admission plugin (CVE-2023-2728)
Anthos on Bare Metal does not use ImagePolicyWebhook and is not affected by CVE-2023-2727.
All versions of Anthos on Bare Metal are potentially vulnerable to CVE-2023-2728.

What should I do?

2023-08-11 Update: The following versions of Google Distributed Cloud Virtual for Bare Metal have been updated with code to fix this vulnerability. Upgrade your nodes to one of the following Google Distributed Cloud Virtual for Bare Metal versions:

  • 1.13.9
  • 1.14.7
  • 1.15.3

What vulnerabilities are being addressed?

With CVE-2023-2727, users may be able to launch containers using images that are restricted by ImagePolicyWebhook when using ephemeral containers. Kubernetes clusters are only affected if the ImagePolicyWebhook admission plugin is used together with ephemeral containers. This CVE can also be mitigated by using validation webhooks, such as Gatekeeper and Kyverno, to enforce the same restrictions.

In CVE-2023-2728, users may be able to launch containers that bypass the mountable secrets policy enforced by the ServiceAccount admission plugin when using ephemeral containers. The policy ensures that Pods running with a service account may only reference secrets specified in the service account's secrets field. Clusters are impacted by this vulnerability if:

  • The ServiceAccount admission plugin is used.
  • The kubernetes.io/enforce-mountable-secrets annotation is used by a service account. This annotation is not added by default.
  • Pods are using ephemeral containers.
Medium

GCP-2023-009

Published: 2023-06-06
Reference: CVE-2023-2878

GKE

Description Severity

A new vulnerability (CVE-2023-2878) has been discovered in the secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions.

GKE is not affected by this CVE.

What should I do?

While GKE is not affected, if you have installed the secrets-store-csi-driver component, you should update your installation with a patched version.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-2878, was discovered in secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions. Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.

None

GKE on VMware

Description Severity

A new vulnerability (CVE-2023-2878) has been discovered in the secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions.

GKE on VMware is not affected by this CVE.

What should I do?

While GKE on VMware is not affected, if you have installed the secrets-store-csi-driver component, you should update your installation with a patched version.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-2878, was discovered in secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions. Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.

None

GKE on AWS

Description Severity

A new vulnerability (CVE-2023-2878) has been discovered in the secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions.

GKE on AWS is not affected by this CVE.

What should I do?

While GKE on AWS is not affected, if you have installed the secrets-store-csi-driver component, you should update your installation with a patched version.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-2878, was discovered in secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions. Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.

None

GKE on Azure

Description Severity

A new vulnerability (CVE-2023-2878) has been discovered in the secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions.

GKE on Azure is not affected by this CVE

What should I do?

While GKE on Azure is not affected, if you have installed the secrets-store-csi-driver component, you should update your installation with a patched version.

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-2878, was discovered in secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions. Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.

None

GKE on Bare Metal

Description Severity

A new vulnerability (CVE-2023-2878) has been discovered in the secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions.

GKE on Bare Metal is not affected by this CVE.

What should I do?

While GKE on Bare Metal is not affected, if you have installed the secrets-store-csi-driver component, you should update your installation with a patched version

What vulnerabilities are addressed by this patch?

The vulnerability, CVE-2023-2878, was discovered in secrets-store-csi-driver where an actor with access to the driver logs could observe service account tokens. These tokens could then potentially be exchanged with external cloud providers to access secrets stored in cloud vault solutions. Tokens are only logged when TokenRequests is configured in the CSIDriver object and the driver is set to run at log level 2 or greater via the -v flag.

None

GCP-2023-008

Published: 2023-06-05
Reference: CVE-2023-1872

GKE

Description Severity

A new vulnerability (CVE-2023-1872) has been discovered in the Linux kernel that can lead to a privilege escalation to root on the node. GKE Standard and Autopilot clusters are affected.

Clusters using GKE Sandbox are not affected.

What should I do?

The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

  • 1.22.17-gke.11400
  • 1.23.17-gke.5600
  • 1.24.13-gke.2500
  • 1.25.9-gke.2300
  • 1.26.5-gke.1200

A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

What vulnerabilities are addressed by this patch?

CVE-2023-1872 is a use-after-free vulnerability in the io_uring subsystem of the Linux kernel that can be exploited to achieve local privilege escalation. The io_file_get_fixed function lacks the presence of ctx->uring_lock, which can lead to a use-after-free vulnerability due to a race condition with fixed files becoming unregistered.

High

GKE on VMware

Description Severity

A new vulnerability (CVE-2023-1872) has been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

What should I do?

What vulnerabilities are addressed by this patch?

CVE-2023-1872 is a use-after-free vulnerability in the io_uring subsystem of the Linux kernel that can be exploited to achieve local privilege escalation. The io_file_get_fixed function lacks the presence of ctx->uring_lock, which can lead to a use-after-free vulnerability due to a race condition with fixed files becoming unregistered.

High

GKE on AWS

Description Severity

A new vulnerability (CVE-2023-1872) has been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

What should I do?

The following versions of GKE on AWS have been updated with code to fix these vulnerabilities:

  • 1.15.1
  • What vulnerabilities are addressed by this patch?

    CVE-2023-1872 is a use-after-free vulnerability in the io_uring subsystem of the Linux kernel that can be exploited to achieve local privilege escalation. The io_file_get_fixed function lacks the presence of ctx->uring_lock, which can lead to a use-after-free vulnerability due to a race condition with fixed files becoming unregistered.

    High

    GKE on Azure

    Description Severity

    A new vulnerability (CVE-2023-1872) has been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    What should I do?

    The following versions of GKE on Azure have been updated with code to fix these vulnerabilities:

  • 1.15.1
  • What vulnerabilities are addressed by this patch?

    CVE-2023-1872 is a use-after-free vulnerability in the io_uring subsystem of the Linux kernel that can be exploited to achieve local privilege escalation. The io_file_get_fixed function lacks the presence of ctx->uring_lock, which can lead to a use-after-free vulnerability due to a race condition with fixed files becoming unregistered.

    High

    GKE on Bare Metal

    Description Severity

    A new vulnerability (CVE-2023-1872) has been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    GKE on Bare Metal is not affected by this CVE.

    What should I do?

    No action required.

    None

    GCP-2023-005

    Published: 2023-05-18
    Updated: 2023-06-06
    Reference: CVE-2023-1281, CVE-2023-1829

    2023-06-06 Update: New GKE versions have been updated to include the latest Ubuntu versions that patch CVE-2023-1281 and CVE-2023-1829.

    GKE

    Updated: 2023-06-06

    Description Severity

    Two new vulnerabilities (CVE-2023-1281, CVE-2023-1829) have been discovered in the Linux kernel that can lead to a privilege escalation to root on the node. GKE Standard clusters are affected.

    GKE Autopilot clusters and clusters using GKE Sandbox are not affected.

    What should I do?

    2023-06-06 Update: Ubuntu patch versions are available.

    The following GKE versions have been updated to include the latest Ubuntu versions that patch CVE-2023-1281 and CVE-2023-1829:

    • 1.23.17-gke.6800
    • 1.24.14-gke.1200
    • 1.25.10-gke.1200
    • 1.26.5-gke.1200

    The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your cluster and node pools to one of the following GKE versions:

    • 1.22.17-gke.8100
    • 1.23.17-gke.2300
    • 1.24.12-gke.1100
    • 1.25.8-gke.1000
    • 1.26.3-gke.1000

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    Both CVE-2023-1281 and CVE-2023-1829 are use-after-free vulnerabilities in the Linux Kernel traffic control index filter (tcindex) that can be exploited to achieve local privilege escalation.

    With CVE-2023-1829, the tcindex_delete function does not properly deactivate filters in certain cases which can later lead to double freeing of a data structure.

    In CVE-2023-1281, the imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when tcf_exts_exec() is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.

    High

    GKE on VMware

    Description Severity

    Two new vulnerabilities (CVE-2023-1281, CVE-2023-1829) have been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    What should I do?

    What vulnerabilities are addressed by this patch?

    Both CVE-2023-1281 and CVE-2023-1829 are use-after-free vulnerabilities in the Linux Kernel traffic traffic control index filter (tcindex) that can be exploited to achieve local privilege escalation.

    With CVE-2023-1829, the tcindex_delete function does not properly deactivate filters in certain cases which can later lead to double freeing of a data structure.

    In CVE-2023-1281, the imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when tcf_exts_exec() is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.

    High

    GKE on AWS

    Description Severity

    Two new vulnerabilities (CVE-2023-1281, CVE-2023-1829) have been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    What should I do?

    What vulnerabilities are addressed by this patch?

    Both CVE-2023-1281 and CVE-2023-1829 are use-after-free vulnerabilities in the Linux Kernel traffic traffic control index filter (tcindex) that can be exploited to achieve local privilege escalation.

    With CVE-2023-1829, the tcindex_delete function does not properly deactivate filters in certain cases which can later lead to double freeing of a data structure.

    In CVE-2023-1281, the imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when tcf_exts_exec() is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.

    High

    GKE on Azure

    Description Severity

    Two new vulnerabilities (CVE-2023-1281, CVE-2023-1829) have been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    What should I do?

    What vulnerabilities are addressed by this patch?

    Both CVE-2023-1281 and CVE-2023-1829 are use-after-free vulnerabilities in the Linux Kernel traffic traffic control index filter (tcindex) that can be exploited to achieve local privilege escalation.

    With CVE-2023-1829, the tcindex_delete function does not properly deactivate filters in certain cases which can later lead to double freeing of a data structure.

    In CVE-2023-1281, the imperfect hash area can be updated while packets are traversing, which will cause a use-after-free when tcf_exts_exec() is called with the destroyed tcf_ext. A local attacker user can use this vulnerability to elevate its privileges to root.

    High

    GKE on Bare Metal

    Description Severity

    Two new vulnerabilities (CVE-2023-1281, CVE-2023-1829) have been discovered in the Linux kernel that can lead to a privilege escalation to root on the node.

    GKE on Bare Metal are not affected by this CVE.

    What should I do?

    No action required.

    None

    GCP-2023-003

    Published: 2023-04-11
    Updated: 2023-12-21
    Reference: CVE-2023-0240, CVE-2023-23586

    2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

    GKE

    Updated: 2023-12-21

    Description Severity

    2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

    Two new vulnerabilities, CVE-2023-0240 and CVE-2023-23586, have been discovered in the Linux kernel that could allow an unprivileged user to escalate privileges. GKE clusters, including Autopilot clusters, with COS using Linux Kernel version 5.10 until 5.10.162 are affected. GKE clusters using Ubuntu images or using GKE Sandbox are unaffected.

    What should I do?

    The following versions of GKE have been updated with code to fix these vulnerabilities. For security purposes, even if you have node-autoupgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • 1.22.17-gke.4000
    • 1.23.16-gke.1100
    • 1.24.10-gke.1200

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    Vulnerability 1 (CVE-2023-0240): A race condition in io_uring can lead to a full container break out to root on the node. Linux kernel versions 5.10 are affected until 5.10.162.

    Vulnerability 2 (CVE-2023-23586): A use after free (UAF) in io_uring/time_ns can lead to a full container break out to root on the node. Linux kernel versions 5.10 are affected until 5.10.162.

    High

    GKE on VMware

    Description Severity

    Two new vulnerabilities, CVE-2023-0240 and CVE-2023-23586, have been discovered in the Linux kernel that could allow an unprivileged user to escalate privileges. GKE on VMware clusters with COS using Linux Kernel version 5.10 until 5.10.162 are affected. GKE Enterprise clusters using Ubuntu images are unaffected.

    What should I do?

    The following versions of GKE on VMware have been updated with code to fix these vulnerabilities:

    • 1.12.6
    • 1.13.5

    What vulnerabilities are addressed by this patch?

    Vulnerability 1 (CVE-2023-0240): A race condition in io_uring can lead to a full container break out to root on the node. Linux kernel versions 5.10 are affected until 5.10.162.

    Vulnerability 2 (CVE-2023-23586): A use after free (UAF) in io_uring/time_ns can lead to a full container break out to root on the node. Linux kernel versions 5.10 are affected until 5.10.162.

    High

    GKE on AWS

    Description Severity

    Two new vulnerabilities, CVE-2023-0240 and CVE-2023-23586, have been discovered in the Linux kernel that could allow an unprivileged user to escalate privileges. GKE on AWS is not affected by these CVEs.

    What should I do?

    No action required.

    None

    GKE on Azure

    Description Severity

    Two new vulnerabilities, CVE-2023-0240 and CVE-2023-23586, have been discovered in the Linux kernel that could allow an unprivileged user to escalate privileges. GKE on Azure is not affected by these CVEs

    What should I do?

    No action required.

    None

    GKE on Bare Metal

    Description Severity

    Two new vulnerabilities, CVE-2023-0240 and CVE-2023-23586, have been discovered in the Linux kernel that could allow an unprivileged user to escalate privileges. GKE on Bare Metal is not affected by these CVEs.

    What should I do?

    No action required.

    None

    GCP-2023-001

    Published: 2023-03-01
    Updated: 2023-12-21
    Reference: CVE-2022-4696

    2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

    GKE

    Description Severity

    2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

    A new vulnerability (CVE-2022-4696) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE clusters, including Autopilot clusters, are impacted. GKE clusters using GKE Sandbox are not affected.

    What should I do?

    The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your clusters and node pools to one of the following GKE versions:

    • 1.22.17-gke.3100
    • 1.23.16-gke.200
    • 1.24.9-gke.3200

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-4696, a use-after-free flaw was found in io_uring and ioring_op_splice in the Linux kernel. This flaw allows a local user to create a local privilege escalation.

    High

    GKE on VMware

    Description Severity

    A new vulnerability (CVE-2022-4696) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on VMware running v1.12 and v1.13 are impacted. GKE on VMware running v1.14 or later are not affected.

    What should I do?

    The following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to one of the following GKE on VMware versions:

    • 1.12.5
    • 1.13.5

    What vulnerabilities are addressed by this patch?

    With CVE-2022-4696, a use-after-free flaw was found in io_uring and ioring_op_splice in the Linux kernel. This flaw allows a local user to create a local privilege escalation.

    High

    GKE on AWS

    Description Severity

    A new vulnerability (CVE-2022-4696) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on AWS is unaffected by this vulnerability.

    What should I do?

    No action is required.

    None

    GKE on Azure

    Description Severity

    A new vulnerability (CVE-2022-4696) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on Azure is unaffected by this vulnerability.

    What should I do?

    No action is required.

    None

    GKE on Bare Metal

    Description Severity

    A new vulnerability (CVE-2022-4696) has been discovered in the Linux kernel that can lead to a privilege escalation on the node. GKE on Bare Metal is unaffected by this vulnerability.

    What should I do?

    No action is required.

    None

    GCP-2022-026

    Published: 2023-01-11
    Reference: CVE-2022-3786, CVE-2022-3602

    GKE

    Description Severity

    Two new vulnerabilities (CVE-2022-3786 and CVE-2022-3602) have been discovered in OpenSSL v3.0.6 that can potentially cause a crash. While this has been rated a High in the NVD database, GKE endpoints use boringSSL or an older version of OpenSSL that is not affected, so the rating has been reduced to a Medium for GKE.

    What should I do?

    The following versions of GKE have been updated with code to fix this vulnerability:

    • 1.25.4-gke.1600
    • 1.24.8-gke.401
    • 1.23.14-gke.401
    • 1.22.16-gke.1300
    • 1.21.14-gke.14100

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-3786 and CVE-2022-3602, a buffer overrun can be triggered in X.509 certificate verification that can cause a crash that will result in a denial of service. To be exploited, this vulnerability requires either a CA to have signed a malicious certificate or for an application to continue certificate verification despite failure to construct a path to a trusted issuer.

    Medium

    GKE on VMware

    Description Severity

    Two new vulnerabilities (CVE-2022-3786 and CVE-2022-3602) have been discovered in OpenSSL v3.0.6 that can potentially cause a crash.

    What should I do?

    GKE on VMware is not affected by this CVE as it does not use an impacted version of OpenSSL.

    What vulnerabilities are addressed by this patch?

    No action required.

    None

    GKE on AWS

    Description Severity

    Two new vulnerabilities (CVE-2022-3786 and CVE-2022-3602) have been discovered in OpenSSL v3.0.6 that can potentially cause a crash.

    What should I do?

    GKE on AWS is not affected by this CVE as it does not use an impacted version of OpenSSL.

    What vulnerabilities are addressed by this patch?

    No action required.

    None

    GKE on Azure

    Description Severity

    Two new vulnerabilities (CVE-2022-3786 and CVE-2022-3602) have been discovered in OpenSSL v3.0.6 that can potentially cause a crash.

    What should I do?

    GKE on Azure is not affected by this CVE as it does not use an impacted version of OpenSSL.

    What vulnerabilities are addressed by this patch?

    No action required.

    None

    GKE on Bare Metal

    Description Severity

    Two new vulnerabilities (CVE-2022-3786 and CVE-2022-3602) have been discovered in OpenSSL v3.0.6 that can potentially cause a crash.

    What should I do?

    GKE on Bare Metal is not affected by this CVE as it does not use an impacted version of OpenSSL.

    What vulnerabilities are addressed by this patch?

    No action required.

    None

    GCP-2022-025

    Published: 2022-12-21
    Updated: 2023-01-19, 2023-12-21
    Reference: CVE-2022-2602

    2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

    2023-01-19 Update: GKE version 1.21.14-gke.14100 is available.

    GKE

    Updated: 2023-01-19

    Description Severity

    2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

    A new vulnerability (CVE-2022-2602) has been discovered in the io_uring subsystem in the Linux kernel that can allow an attacker to potentially execute arbitrary code. GKE clusters, including Autopilot clusters, are impacted.

    GKE clusters using GKE Sandbox are not affected.

    What should I do?

    2023-01-19 Update: Version 1.21.14-gke.14100 is available. Upgrade your node pools to this version or later.


    The following versions of GKE have been updated with code to fix this vulnerability in an upcoming release. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • Container-Optimized OS:
      • 1.22.16-gke.1300 and later
      • 1.23.14-gke.401 and later
      • 1.24.7-gke.900 and later
      • 1.25.4-gke.1600 and later
    • Ubuntu:
      • 1.22.15-gke.2500 and later
      • 1.23.13-gke.900 and later
      • 1.24.7-gke.900 and later
      • 1.25.3-gke.800 and later

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2602, a race condition between io_uring request processing and Unix socket garbage collection can cause a use-after-free vulnerability. A local attacker could use this to trigger a denial of service or possibly execute arbitrary code.

    High

    GKE on VMware

    Description Severity

    A new vulnerability (CVE-2022-2602) has been discovered in the io_uring subsystem in the Linux kernel that can allow an attacker to potentially execute arbitrary code.

    Versions 1.11, 1.12 and 1.13 of GKE on VMware are affected.

    What should I do?

    Upgrade your cluster to a patched version. The following versions of GKE on VMware contain code that fixes this vulnerability:

    • 1.13.2
    • 1.12.4
    • 1.11.5

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2602, a race condition between io_uring request processing and Unix socket garbage collection can cause a use-after-free vulnerability. A local attacker could use this to trigger a denial of service or possibly execute arbitrary code.

    High

    GKE on AWS

    Description Severity

    A new vulnerability (CVE-2022-2602) has been discovered in the io_uring subsystem in the Linux kernel that can allow an attacker to potentially execute arbitrary code.

    What should I do?

    The following current and previous generation versions of GKE on AWS have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on AWS versions:

    • Current generation:
      • 1.22.15-gke.100
      • 1.23.11-gke.300
      • 1.24.5-gke.200
    • Previous generation:
      • 1.22.15-gke.1400
      • 1.23.12-gke.1400
      • 1.24.6-gke.1300

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2602, a race condition between io_uring request processing and Unix socket garbage collection can cause a use-after-free vulnerability. A local attacker could use this to trigger a denial of service or possibly execute arbitrary code.

    High

    GKE on Azure

    Description Severity

    A new vulnerability (CVE-2022-2602) has been discovered in the io_uring subsystem in the Linux kernel that can allow an attacker to potentially execute arbitrary code.

    What should I do?

    The following versions of GKE on Azure have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on Azure versions:

    • 1.22.15-gke.100
    • 1.23.11-gke.300
    • 1.24.5-gke.200

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2602, a race condition between io_uring request processing and Unix socket garbage collection can cause a use-after-free vulnerability. A local attacker could use this to trigger a denial of service or possibly execute arbitrary code.

    High

    GKE on Bare Metal

    Description Severity

    A new vulnerability (CVE-2022-2602) has been discovered in the io_uring subsystem in the Linux kernel that can allow an attacker to potentially execute arbitrary code.

    GKE on Bare Metal is not affected by this CVE as it does not bundle an operating system in its distribution.

    What should I do?

    No action required.

    None

    GCP-2022-024

    Published: 2022-11-09
    Updated: 2023-01-19
    Reference: CVE-2022-2585, CVE-2022-2588

    2023-01-19 Update: GKE version 1.21.14-gke.14100 is available.
    2022-12-16 Update: Added revised patch versions for GKE and GKE on VMware.

    GKE

    Updated: 2023-01-19

    Description Severity

    Two new vulnerabilities (CVE-2022-2585 and CVE-2022-2588) have been discovered in the Linux kernel that can lead to a full container break out to root on the node. GKE clusters, including Autopilot clusters, are impacted.

    GKE clusters using GKE Sandbox are not affected.

    What should I do?

    2023-01-19 Update: Version 1.21.14-gke.14100 is available. Upgrade your node pools to this version or later.

    2022-12-16 Update: A previous version of the bulletin has been revised due to a release regression. Please manually upgrade your node pools to one of the following GKE versions:

    • 1.22.16-gke.1300 and later
    • 1.23.14-gke.401 and later
    • 1.24.7-gke.900 and later
    • 1.25.4-gke.1600 and later

    The following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node-autoupgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • 1.21.14-gke.9500
    • 1.24.7-gke.900

    Updates for GKE v1.22, 1.23 and 1.25 will be made available soon. This security bulletin will be updated when they become available.

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    • With CVE-2022-2585, improper cleanup of timers in the posix cpu timer allows a use-after-free exploit depending on how timers are created and deleted.
    • With CVE-2022-2588, a use-after-free flaw was found in route4_change in the Linux kernel. This flaw allows a local user to crash the system and possibly lead to a local privilege escalation.
    High

    GKE on VMware

    Updated: 2022-12-16

    Description Severity

    Two new vulnerabilities (CVE-2022-2585 and CVE-2022-2588) have been discovered in the Linux kernel that can lead to a full container break out to root on the node.

    Versions 1.13, 1.12 and 1.11 of GKE on VMware are affected.

    What should I do?

    2022-12-16 Update: The following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to one of the following GKE on VMware versions:

    • 1.13.2
    • 1.12.4
    • 1.11.6

    • Note: Versions of GKE on VMware that contain Container-Optimized OS patches will be released soon. This security bulletin will be updated when the GKE on VMware versions are available for download.

    What vulnerabilities are addressed by this patch?

    • With CVE-2022-2585, improper cleanup of timers in the posix cpu timer allows a use-after-free exploit depending on how timers are created and deleted.
    • With CVE-2022-2588, a use-after-free flaw was found in route4_change in the Linux kernel. This flaw allows a local user to crash the system and possibly lead to a local privilege escalation.
    High

    GKE on AWS

    Description Severity

    Two new vulnerabilities (CVE-2022-2585 and CVE-2022-2588) have been discovered in the Linux kernel that can lead to a full container break out to root on the node.

    The following versions of Kubernetes on AWS may be affected:

    • 1.23: Versions older than 1.23.9-gke.800. Newer minor versions are not affected
    • 1.22: Versions older than 1.22.12-gke.1100. Newer minor versions are not affected

    Kubernetes V1.24 is not affected.

    What should I do?

    We recommend that you upgrade your clusters to one of the following AWS Kubernetes versions:

    • 1.23: a version later than v1.23.9-gke.800
    • 1.22: a version later than 1.22.12-gke-1100

    What vulnerabilities are being addressed?

    With CVE-2022-2585, improper cleanup of timers in the posix cpu timer allows a use-after-free exploit depending on how timers are created and deleted.

    With CVE-2022-2588, a use-after-free flaw was found in route4_change in the Linux kernel. This flaw allows a local user to crash the system and possibly lead to a local privilege escalation.

    High

    GKE on Azure

    Description Severity

    Two new vulnerabilities (CVE-2022-2585 and CVE-2022-2588) have been discovered in the Linux kernel that can lead to a full container break out to root on the node.

    The following versions of Kubernetes on Azure may be affected:

    • 1.23: Versions older than 1.23.9-gke.800. Newer minor versions are not affected.
    • 1.22: Versions older than 1.22.12-gke.1100. Newer minor versions are not affected.

    Kubernetes V1.24 is not affected.

    What should I do?

    We recommend that you upgrade your clusters to one of the following Azure Kubernetes versions:

    • 1.23: a version later than v1.23.9-gke.800
    • 1.22: a version later than 1.22.12-gke-1100

    What vulnerabilities are being addressed?

    With CVE-2022-2585, improper cleanup of timers in the posix cpu timer allows a use-after-free exploit depending on how timers are created and deleted.

    With CVE-2022-2588, a use-after-free flaw was found in route4_change in the Linux kernel. This flaw allows a local user to crash the system and possibly lead to a local privilege escalation.

    High

    GKE on Bare Metal

    Description Severity

    Two new vulnerabilities (CVE-2022-2585 and CVE-2022-2588) have been discovered in the Linux kernel that can lead to a full container break out to root on the node.

    GKE on Bare Metal is not affected by this CVE as it does not bundle an operating system in its distribution.

    What should I do?

    No action required.

    None

    GCP-2022-023

    Published: 2022-11-04
    Reference: CVE-2022-39278

    GKE

    Description Severity

    A security vulnerability, CVE-2022-39278, has been discovered in Istio, which is used in Anthos Service Mesh, that allows a malicious attacker to crash the control plane.

    What should I do?

    Google Kubernetes Engine (GKE) doesn't ship with Istio and isn't affected by this vulnerability. However, if you have separately installed Anthos Service Mesh or Istio on your GKE cluster, refer to GCP-2022-020, the Anthos Service Mesh security bulletin on this CVE, for more information.

    None

    GKE on VMware

    Description Severity

    A security vulnerability, CVE-2022-39278, has been discovered in Istio, which is used in Anthos Service Mesh in GKE on VMware, that allows a malicious attacker to crash the Istio control plane.

    What should I do?

    The following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to one of the following GKE on VMware versions:

    • 1.11.4
    • 1.12.3
    • 1.13.1

    What vulnerabilities are addressed by this patch?

    With vulnerability CVE-2022-39278, the Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker to send a specially crafted message which results in the control plane crashing when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, but doesn't require any authentication from the attacker.

    High

    GKE on AWS

    Description Severity

    A security vulnerability, CVE-2022-39278, has been discovered in Istio, which is used in Anthos Service Mesh, that allows a malicious attacker to crash the control plane.

    What should I do?

    GKE on AWS isn't affected by this vulnerability and no action is required.

    None

    GKE on Azure

    Description Severity

    A security vulnerability, CVE-2022-39278, has been discovered in Istio, which is used in Anthos Service Mesh, that allows a malicious attacker to crash the control plane.

    What should I do?

    GKE on Azure isn't affected by this vulnerability and no action is required.

    None

    GKE on Bare Metal

    Description Severity

    A security vulnerability, CVE-2022-39278, has been discovered in Istio, which is used in Anthos Service Mesh in GKE on Bare Metal, that allows a malicious attacker to crash the Istio control plane.

    What should I do?

    The following versions of GKE on Bare Metal have been updated with code to fix this vulnerability. We recommend that you upgrade clusters to one of the following GKE on Bare Metal versions:

    • 1.11.7
    • 1.12.4
    • 1.13.1

    What vulnerabilities are addressed by this patch?

    With vulnerability CVE-2022-39278, the Istio control plane, istiod, is vulnerable to a request processing error, allowing a malicious attacker to send a specially crafted message which results in the control plane crashing when the validating webhook for a cluster is exposed publicly. This endpoint is served over TLS port 15017, but doesn't require any authentication from the attacker.

    High

    GCP-2022-022-updated

    Published: 2022-12-08
    Reference: CVE-2022-20409

    GKE

    Updated: 2022-12-14

    Description Severity

    A new vulnerability, CVE-2022-20409, has been discovered in the Linux kernel that can lead to local privilege escalation. Google Kubernetes Engine (GKE) v1.22, v1.23, and v1.24 clusters, including Autopilot clusters, using Container-Optimized OS version 93 and 97 are impacted. Other supported GKE versions aren't affected. GKE clusters using GKE Sandbox are unaffected.

    What should I do?

    2022-12-14 Update: A previous version of the bulletin has been revised due to a release regression. Please manually upgrade your node pools to one of the following GKE versions:

    • 1.22.15-gke.2500 and later
    • 1.23.13-gke.900 and later
    • 1.24.7-gke.900 and later

    The following versions of GKE using Container-Optimized OS version 93 and 97 have been updated with code to fix this vulnerability in an upcoming release. For security purposes, even if you have node auto-upgrades enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • 1.22.15-gke.2300 and later
    • 1.23.13-gke.700 and later
    • 1.24.7-gke.700 and later

    A recent feature of release channels lets you apply a patch without having to unsubscribe from a channel. This feature lets you secure your nodes until the new version becomes the default for your release-specific channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-20409, the Linux Kernel has a vulnerability in io_identity_cow of the io_uring subsystem. There's a potential for memory corruption due to a Use-After-Free (UAF) vulnerability. A local attacker could use this memory corruption for denial of service (system crash) or possibly to execute arbitrary code.

    High

    GKE on VMware

    Updated: 2022-12-14

    Description Severity

    A new vulnerability, CVE-2022-20409, has been discovered in the Linux kernel that can lead to local privilege escalation.

    What should I do?

    2022-12-14 Update: The following versions of GKE on VMware for Ubuntu have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on VMware versions:

    • 1.13.1 and later
    • 1.12.3 and later
    • 1.11.4 and later

    What vulnerabilities are addressed by this patch?

    With CVE-2022-20409, the Linux Kernel has a vulnerability in io_identity_cow of the io_uring subsystem. There's a potential for memory corruption due to a Use-After-Free (UAF) vulnerability. A local attacker could use this memory corruption for denial of service (system crash) or possibly to execute arbitrary code.

    High

    GKE on AWS

    Description Severity

    A new vulnerability, CVE-2022-20409, has been discovered in the Linux kernel that could allow an unprivileged user to escalate to system execution privilege.

    What should I do?

    There's no action required. GKE on AWS doesn't use the affected versions of the Linux kernel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-20409, the Linux Kernel has a vulnerability in io_identity_cow of the io_uring subsystem. There's a potential for memory corruption due to a Use-After-Free (UAF) vulnerability. A local attacker could use this memory corruption for denial of service (system crash) or possibly to execute arbitrary code.

    None

    GKE on Azure

    Description Severity

    A new vulnerability, CVE-2022-20409, has been discovered in the Linux kernel that could allow an unprivileged user to escalate to system execution privilege.

    What should I do?

    There's no action required. GKE on Azure doesn't use the affected versions of the Linux kernel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-20409, the Linux Kernel has a vulnerability in io_identity_cow of the io_uring subsystem. There's a potential for memory corruption due to a Use-After-Free (UAF) vulnerability. A local attacker could use this memory corruption for denial of service (system crash) or possibly to execute arbitrary code.

    None

    GKE on Bare Metal

    Description Severity

    A new vulnerability, CVE-2022-20409, has been discovered in the Linux kernel that can lead to local privilege escalation.

    What should I do?

    • There's no action required. GKE on Bare Metal isn't affected by this CVE as it doesn't bundle an operating system in its distribution.
    None

    GCP-2022-021

    Published: 2022-10-27
    Updated: 2023-01-19, 2023-12-21
    Reference: CVE-2022-3176

    2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

    2023-01-19 Update: GKE version 1.21.14-gke.14100 is available.
    2022-12-15 Update: Updated information that version 1.21.14-gke.9400 of Google Kubernetes Engine is pending rollout and may be superseded by a higher version number.
    2022-11-21 Update: Added patch versions for GKE on VMware, GKE on AWS, and GKE on Azure.

    GKE

    Updated: 2023-01-19, 2023-12-21

    Description Severity

    A new vulnerability, CVE-2022-3176, has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve full container breakout to root on the node.

    2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

    Google Kubernetes Engine (GKE) v1.21 clusters, including Autopilot clusters, using Container-Optimized OS version 89 are impacted. Later versions of GKE aren't affected. All Linux clusters with Ubuntu are affected. GKE clusters using GKE Sandbox are unaffected.

    What should I do?

    2023-01-19 Update: Version 1.21.14-gke.14100 is available. Upgrade your node pools to this version or later.

    2022-12-15 Update: Version 1.21.14-gke.9400 is pending rollout and may be superseded by a higher version number. We will update this doc when said new version is available.


    The following versions of GKE have been updated with code to fix this vulnerability in an upcoming release. For security purposes, even if you have node auto-upgrades enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • Container-Optimized OS:
      • 1.21.14-gke.7100 and later
    • Ubuntu:
      • 1.21.14-gke.9400 and later
      • 1.22.15-gke.2400 and later
      • 1.23.13-gke.800 and later
      • 1.24.7-gke.800 and later
      • 1.25.3-gke.700 and later

    A recent feature of release channels lets you apply a patch without having to unsubscribe from a channel. This feature lets you secure your nodes until the new version becomes the default for your release-specific channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-3176, the Linux Kernel has a vulnerability in the io_uring subsystem. Missing POLLFREE handling can lead to Use-After-Free (UAF) exploits that can be used for privilege escalation.

    High

    GKE on VMware

    Updated: 2022-11-21

    Description Severity

    A new vulnerability, CVE-2022-3176, has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve full container breakout to root on the node.

    What should I do?

    • Versions of GKE on VMware with Container-Optimized OS are unaffected.

    2022-11-21 Update: The following versions of GKE on VMware for Ubuntu have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on VMware versions:

    • 1.12.3 and later
    • 1.13.1 and later
    • 1.11.5 and later

    Versions of GKE on VMware that contain Ubuntu patches will be released soon. This security bulletin will be updated when the GKE on VMware versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-3176, the Linux Kernel has a vulnerability in the io_uring subsystem. Missing POLLFREE handling can lead to Use-After-Free (UAF) exploits that can be used for privilege escalation.

    High

    GKE on AWS

    Updated: 2022-11-21

    Description Severity

    A new vulnerability, CVE-2022-3176, has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve full container breakout to root on the node.

    What should I do?

    2022-11-21 Update: The following current and previous generation versions of GKE on AWS have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on AWS versions:

    Current generation
    • 1.21.14-gke.7100
    • 1.22.15-gke.100
    • 1.23.11-gke.300
    • 1.24.5-gke.200
    Previous generation
    • 1.22.15-gke.1400
    • 1.23.12-gke.1400
    • 1.24.6-gke.1300

    Versions of GKE on AWS that contain Ubuntu patches will be released soon. This security bulletin will be updated when the GKE on AWS versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-3176, the Linux Kernel has a vulnerability in the io_uring subsystem. Missing POLLFREE handling can lead to Use-After-Free (UAF) exploits that can be used for privilege escalation.

    High

    GKE on Azure

    Updated: 2022-11-21

    Description Severity

    A new vulnerability, CVE-2022-3176, has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve full container breakout to root on the node.

    What should I do?

    2022-11-21 Update: The following versions of GKE on Azure have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on Azure versions:

    • 1.21.14-gke.7100
    • 1.22.15-gke.100
    • 1.23.11-gke.300
    • 1.24.5-gke.200

    Versions of GKE on Azure that contain Ubuntu patches will be released soon. This security bulletin will be updated when the GKE on Azure versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-3176, the Linux Kernel has a vulnerability in the io_uring subsystem. Missing POLLFREE handling can lead to Use-After-Free (UAF) exploits that can be used for privilege escalation.

    High

    GKE on Bare Metal

    Description Severity

    A new vulnerability, CVE-2022-3176, has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve full container breakout to root on the node.

    What should I do?

    No action required. GKE on Bare Metal isn't affected by this CVE as it doesn't bundle an operating system in its distribution.

    None

    GCP-2022-018

    Published: 2022-08-01
    Updated: 2022-09-14, 2023-12-21
    Reference: CVE-2022-2327

    2023-12-21 Update: Clarify that GKE Autopilot clusters in the default configuration are not impacted.

    2022-09-14 Update: Added patch versions for GKE on VMware, GKE on AWS, and GKE on Azure.

    GKE

    Updated: 2023-12-21

    Description Severity

    A new vulnerability (CVE-2022-2327) has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve a full container breakout to root on the node.

    Technical details

    2023-12-21 Update: The original bulletin stated Autopilot clusters are impacted, but this was incorrect. GKE Autopilot clusters in the default configuration are not impacted, but might be vulnerable if you explicitly set the seccomp Unconfined profile or allow CAP_NET_ADMIN.

    GKE clusters, including Autopilot clusters, with Container-Optimized OS (COS) using Linux Kernel version 5.10 are affected. GKE clusters using Ubuntu images or using GKE Sandbox are unaffected.

    What should I do?

    Upgrade your GKE clusters to a version that includes the fix. The Linux node images for COS have been updated along with GKE versions using those COS versions.

    For security purposes, even if you have the node autoupgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    COS versions

    • 1.22.12-gke.300
    • 1.23.8-gke.1900
    • 1.24.2-gke.1900


    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you upgrade your nodes to the patched version before that version becomes the default in your selected release channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2327, the Linux kernel in version 5.10 has a vulnerability in the io_uring subsystem where various requests are missing item types (flags). Using these requests without the proper item types specified can cause privilege escalation to root.
    High

    GKE on VMware

    Updated: 2022-09-14

    Description Severity

    A new vulnerability (CVE-2022-2327) has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve a full container breakout to root on the node.

    Clusters with a Container Optimized OS (COS) image using GKE on VMware versions 1.10, 1.11, and 1.12 are affected.

    What should I do?

    2022-09-14 Update: The following versions of GKE on VMware contain code that fixes this vulnerability.

    • 1.10.6 or later
    • 1.11.3 or later
    • 1.12.1 or later

    Versions of GKE on VMware that contain patches will be released soon. This security bulletin will be updated when the GKE on VMware versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2327, the Linux kernel in version 5.10 has a vulnerability in the io_uring subsystem where various requests are missing item types (flags). Using these requests without the proper item types specified can cause privilege escalation to root.

    High

    GKE on AWS

    Updated: 2022-09-14

    Description Severity

    A new vulnerability (CVE-2022-2327) has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve a full container breakout to root on the node.

    What should I do?

    2022-09-14 Update: The following current and previous generation versions of GKE on AWS have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on AWS versions:

    Current generation

    • 1.23.8-gke.1700
    • 1.22.12-gke.200
    • 1.21.14-gke.2100

    Previous generation

    • 1.23.8-gke.2000
    • 1.22.12-gke.300
    • 1.21.14-gke.2100

    Versions of GKE on AWS that contain patches will be released soon. This security bulletin will be updated when the GKE on AWS versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2327, the Linux kernel in version 5.10 has a vulnerability in the io_uring subsystem where various requests are missing item types (flags). Using these requests without the proper item types specified can cause privilege escalation to root.

    High

    GKE on Azure

    Updated: 2022-09-14

    Description Severity

    A new vulnerability (CVE-2022-2327) has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve a full container breakout to root on the node.

    What should I do?

    2022-09-14 Update: The following versions of GKE on Azure have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on Azure versions:

    • 1.23.8-gke.1700
    • 1.22.12-gke.200
    • 1.21.14-gke.2100

    Versions of GKE on Azure that contain patches will be released soon. This security bulletin will be updated when the GKE on Azure versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-2327, the Linux kernel in version 5.10 has a vulnerability in the io_uring subsystem where various requests are missing item types (flags). Using these requests without the proper item types specified can cause privilege escalation to root.

    High

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity

    A new vulnerability (CVE-2022-2327) has been discovered in the Linux kernel that can lead to local privilege escalation. This vulnerability allows an unprivileged user to achieve a full container breakout to root on the node.

    What should I do?

    There is no action required. Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE as it does not bundle an operating system in its distribution.

    None

    GCP-2022-017

    Published: 2022-06-29
    Updated: 2022-11-22
    Reference: CVE-2022-1786
    2022-11-22 Update: Updated information about workloads using GKE Sandbox.
    2022-07-21 Update: Updated information that GKE on VMware COS images are affected.

    GKE

    Updated: 2022-11-22

    Description Severity

    2022-11-22 update: Workloads using GKE Sandbox are not affected by these vulnerabilities.


    A new vulnerability (CVE-2022-1786) has been discovered in the Linux kernel versions 5.10 and 5.11. This vulnerability allows an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node. Only clusters that run Container-Optimized OS are affected. GKE Ubuntu versions use either version 5.4 or 5.15 of the kernel and are not affected.

    What should I do?

    The versions of Linux node images for Container-Optimized OS for the following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node-autoupgrade enabled, we recommend that you manually upgrade your node pools to one of the following upcoming GKE versions:

    • 1.22.10-gke.600
    • 1.23.7-gke.1400
    • 1.24.1-gke.1400

    A recent release channels feature allows you to apply a patch without having to unsubscribe from a channel. This lets you upgrade your nodes to the patched version before that version becomes the default in your selected release channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-1786, a use-after-free flaw was found in the Linux kernel's io_uring subsystem. If a user sets up a ring with IORING_SETUP_IOPOLL with more than one task completing submissions on the ring, a local user can crash or escalate their privileges on the system.

    High

    GKE on VMware

    Updated: 2022-07-14

    Description Severity

    A new vulnerability (CVE-2022-1786) has been discovered in the Linux kernel versions 5.10 and 5.11. This vulnerability allows an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node.

    What should I do?

    2022-07-21 Update: The following versions of GKE on VMware contain code that fixes this vulnerability.

    COS
    • 1.10.5 or later
    • 1.11.2 or later
    • 1.12.0 or later

    Ubuntu

    There is no action required. GKE on VMware does not use the affected versions of the Linux kernel.

    None

    GKE on AWS

    Description Severity

    A new vulnerability (CVE-2022-1786) has been discovered in the Linux kernel versions 5.10 and 5.11. This vulnerability allows an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node.

    What should I do?

    There is no action required. GKE on AWS does not use the affected versions of the Linux kernel.

    None

    GKE on Azure

    Description Severity

    A new vulnerability (CVE-2022-1786) has been discovered in the Linux kernel versions 5.10 and 5.11. This vulnerability allows an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node.

    What should I do?

    There is no action required. GKE on Azure does not use the affected versions of the Linux kernel.

    None

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity

    A new vulnerability (CVE-2022-1786) has been discovered in the Linux kernel versions 5.10 and 5.11. This vulnerability allows an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node.

    What should I do?

    There is no action required. Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE as it does not bundle an operating system in its distribution.

    None

    GCP-2022-016

    Published: 2022-06-23
    Updated: 2022-11-22
    Reference: CVE-2022-29581, CVE-2022-29582, CVE-2022-1116
    2022-11-22 Update: Added information about workloads running in Autopilot clusters.
    2022-07-29 Update: Updated versions for GKE on VMware, GKE on AWS, and GKE on Azure.

    GKE

    Updated: 2022-11-22

    Description Severity

    2022-11-22 update: Autopilot clusters are not affected by CVE-2022-29581 but are vulnerable to CVE-2022-29582 and CVE-2022-1116.


    2022-07-29 update: Pods using GKE Sandbox are not vulnerable to these vulnerabilities.


    Three new memory corruption vulnerabilities (CVE-2022-29581, CVE-2022-29582, CVE-2022-1116) have been discovered in the Linux kernel. These vulnerabilities allow an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node. All Linux clusters (Container-Optimized OS and Ubuntu) are affected.

    What should I do?

    The versions of Linux node images for both Container-Optimized OS and Ubuntu for the following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node auto-upgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • Container-Optimized OS:
      • 1.19.16-gke.13800
      • 1.20.15-gke.8000
      • 1.21.12-gke.1500
      • 1.22.9-gke.1300
      • 1.23.6-gke.1500
      • 1.24.1-gke.1400
    • Ubuntu:
      • 1.20.15-gke.9600
      • 1.21.13-gke.900
      • 1.22.10-gke.600
      • 1.23.7-gke.1400
      • 1.24.1-gke.1400

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you upgrade your nodes to the patched version before that version becomes the default in your selected release channel.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-29582, the Linux kernel in versions prior to 5.17.3 has a use-after-free due to a race condition in io_uring timeouts.

    CVE-2022-29581 and CVE-2022-1116 are vulnerabilities where a local attacker can cause memory corruption in io_uring or net/sched in the Linux kernel to escalate privileges to root.

    High

    GKE on VMware

    Updated: 2022-07-29

    Description Severity

    2022-07-29 Update: The following versions of GKE on VMware contain code that fixes these vulnerabilities.

    • 1.9.7 or later
    • 1.10.5 or later
    • 1.11.2 or later
    • 1.12.0 or later


    Three new memory corruption vulnerabilities (CVE-2022-29581, CVE-2022-29582, CVE-2022-1116) have been discovered in the Linux kernel. These vulnerabilities allow an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node. These vulnerabilities affect GKE on VMware v1.9 and later for Container-Optimized OS and Ubuntu images.

    What should I do?

    Versions of GKE on VMware that contain patches will be released soon. This security bulletin will be updated when the GKE on VMware versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-29582, the Linux kernel in versions prior to 5.17.3 has a use-after-free due to a race condition in io_uring timeouts.

    CVE-2022-29581 and CVE-2022-1116 are vulnerabilities where a local attacker can cause memory corruption in io_uring or net/sched in the Linux kernel to escalate privileges to root.

    High

    GKE on AWS

    Updated: 2022-07-29

    Description Severity

    2022-07-29 Update: Update: The following current and previous generation versions of GKE on AWS have been updated with code to fix these vulnerabilities. We recommend that you upgrade your nodes to one of the following GKE on AWS versions:

    Current generation:

    • 1.23.7-gke.1300
    • 1.22.10-gke.1500
    • 1.21.11-gke.1900
    Previous generation:
    • 1.23.7-gke.1500
    • 1.22.10-gke.1500
    • 1.21.13-gke.1600

    Three new memory corruption vulnerabilities (CVE-2022-29581, CVE-2022-29582, CVE-2022-1116) have been discovered in the Linux kernel. These vulnerabilities allow an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node. These vulnerabilities affect all versions of GKE on AWS.

    What should I do?

    Versions of GKE on AWS that contain patches will be released soon. This security bulletin will be updated when the GKE on AWS versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-29582, the Linux kernel in versions prior to 5.17.3 has a use-after-free due to a race condition in io_uring timeouts.

    CVE-2022-29581 and CVE-2022-1116 are vulnerabilities where a local attacker can cause memory corruption in io_uring or net/sched in the Linux kernel to escalate privileges to root.

    High

    GKE on Azure

    Description Severity

    2022-07-29 Update: Update: The following versions of GKE on Azure have been updated with code to fix these vulnerabilities. We recommend that you upgrade your nodes to one of the following GKE on Azure versions:

    • 1.23.7-gke.1300
    • 1.22.10-gke.1500
    • 1.21.11-gke.1900


    Three new memory corruption vulnerabilities (CVE-2022-29581, CVE-2022-29582, CVE-2022-1116) have been discovered in the Linux kernel. These vulnerabilities allow an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node. These vulnerabilities affect all versions of GKE on Azure.

    What should I do?

    Versions of GKE on Azure that contain patches will be released soon. This security bulletin will be updated when the GKE on Azure versions are available for download.

    What vulnerabilities are addressed by this patch?

    With CVE-2022-29582, the Linux kernel in versions prior to 5.17.3 has a use-after-free due to a race condition in io_uring timeouts.

    CVE-2022-29581 and CVE-2022-1116 are vulnerabilities where a local attacker can cause memory corruption in io_uring or net/sched in the Linux kernel to escalate privileges to root.

    High

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity

    Three new memory corruption vulnerabilities (CVE-2022-29581, CVE-2022-29582, CVE-2022-1116) have been discovered in the Linux kernel. These vulnerabilities allow an unprivileged user with local access to the cluster to achieve a full container breakout to root on the node.

    What should I do?

    There is no action required. Google Distributed Cloud Virtual for Bare Metal is not affected by this vulnerability as it does not bundle an operating system in its distribution.

    None

    GCP-2022-014

    Published: 2022-04-26
    Updated: 2022-11-22
    2022-11-22 Update: Added information about workloads running in Autopilot clusters.
    2022-05-12 Update: Updated patch versions for GKE on AWS and GKE on Azure.
    Reference: CVE-2022-1055, CVE-2022-27666

    GKE

    Updated: 2022-11-22

    Description Severity

    2022-11-22 update: GKE Autopilot clusters and workloads running in GKE Sandbox are unaffected by these vulnerabilities.


    Two security vulnerabilities, CVE-2022-1055 and CVE-2022-27666 have been discovered in the Linux kernel. Each can lead to a local attacker being able to perform a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all GKE node operating systems (Container-Optimized OS and Ubuntu).

    Technical details

    In CVE-2022-1055, an attacker can exploit use-after-free in tc_new_tfilter() which allows a local attacker in the container to escalate privileges to root on node.

    In CVE-2022-27666, buffer overflow in esp/esp6_output_head allows a local attacker in the container to escalate privileges to root on the node.

    What should I do?

    The versions of Linux node images for the following versions of GKE have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following upcoming GKE versions:

    • 1.19.16-gke.11000 and later
    • 1.20.15-gke.5200 and later
    • 1.21.11-gke.1100 and later
    • 1.22.8-gke.200 and later
    • 1.23.5-gke.1500 and later

    What vulnerabilities are addressed by this patch?

    High

    GKE on VMware

    Description Severity

    Two security vulnerabilities, CVE-2022-1055 and CVE-2022-27666 have been discovered in the Linux kernel. Each can lead to a local attacker being able to perform a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all GKE node operating systems (Container-Optimized OS and Ubuntu).

    Technical details

    In CVE-2022-1055, an attacker can exploit use-after-free in tc_new_tfilter() which allows a local attacker in the container to escalate privileges to root on node.

    In CVE-2022-27666, buffer overflow in esp/esp6_output_head allows a local attacker in the container to escalate privileges to root on the node.

    What should I do?

    Upgrade your cluster to a patched version. The following GKE on VMware versions or newer contain the fix for this vulnerability:

    • 1.9.6 (upcoming)
    • 1.10.3
    • 1.11.0 (upcoming)

    What vulnerabilities are addressed by this patch?

    High

    GKE on AWS

    Updated: 2022-05-12

    Description Severity

    Two security vulnerabilities, CVE-2022-1055 and CVE-2022-27666 have been discovered in the Linux kernel. Each can lead to a local attacker being able to perform a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all GKE node operating systems (Container-Optimized OS and Ubuntu).

    Technical details

    In CVE-2022-1055, an attacker can exploit use-after-free in tc_new_tfilter() which allows a local attacker in the container to escalate privileges to root on node.

    In CVE-2022-27666, buffer overflow in esp/esp6_output_head allows a local attacker in the container to escalate privileges to root on the node.

    What should I do?

    2022-05-12 Update: The following current and previous generation versions of GKE on AWS have been updated with code to fix these vulnerabilities. We recommend that you upgrade your nodes to one of the following GKE on AWS versions:

    Current generation
    • 1.21.11-gke.1100
    • 1.22.8-gke.1300
    Previous generation
    • 1.20.15-gke.5200
    • 1.21.11-gke.1100
    • 1.22.8-gke.1300

    Upgrade your cluster to a patched version. Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerabilities are addressed by this patch?

    High

    GKE on Azure

    Updated: 2022-05-12

    Description Severity

    Two security vulnerabilities, CVE-2022-1055 and CVE-2022-27666 have been discovered in the Linux kernel. Each can lead to a local attacker being able to perform a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all GKE node operating systems (Container-Optimized OS and Ubuntu).

    Technical details

    In CVE-2022-1055, an attacker can exploit use-after-free in tc_new_tfilter() which allows a local attacker in the container to escalate privileges to root on node.

    In CVE-2022-27666, buffer overflow in esp/esp6_output_head allows a local attacker in the container to escalate privileges to root on the node.

    What should I do?

    2022-05-12 Update: The following versions of GKE on Azure have been updated with code to fix these vulnerabilities. We recommend that you upgrade your nodes to one of the following GKE on Azure versions:

    • 1.21.11-gke.1100
    • 1.22.8-gke.1300

    Upgrade your cluster to a patched version. Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerabilities are addressed by this patch?

    High

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity

    Two security vulnerabilities, CVE-2022-1055 and CVE-2022-27666 have been discovered in the Linux kernel. Each can lead to a local attacker being able to perform a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all GKE node operating systems (Container-Optimized OS and Ubuntu).

    Technical details

    In CVE-2022-1055, an attacker can exploit use-after-free in tc_new_tfilter() which allows a local attacker in the container to escalate privileges to root on node.

    In CVE-2022-27666, buffer overflow in esp/esp6_output_head allows a local attacker in the container to escalate privileges to root on the node.

    What should I do?

    There is no action required. Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE as it does not include Linux as part of its package. You should ensure that the node images you use are updated to versions that contain the fix for CVE-2022-1055 and CVE-2022-27666.

    What vulnerabilities are addressed by this patch?

    High

    GCP-2022-013

    Published: 2022-04-11
    Updated: 2022-04-20
    Reference: CVE-2022-23648
    2022-04-22 Update: Updated patch versions for Google Distributed Cloud Virtual for Bare Metal and GKE on VMware.

    GKE

    Description Severity

    A security vulnerability, CVE-2022-23648, has been discovered in containerd's handling of path traversal in the OCI image volume specification. Containers launched through containerd's CRI implementation with a specially-crafted image configuration could gain full read access to arbitrary files and directories on the host.

    This vulnerability may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy). This vulnerability affects all GKE node operating systems (Container-Optimized OS and Ubuntu) which use containerd by default. All GKE, Autopilot, and GKE Sandbox nodes are affected.

    What should I do?

    The versions of Linux node images for the following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node-autoupgrade enabled, we recommend that you manually upgrade your nodes to one of the following GKE versions:

    • 1.19.16-gke.9400
    • 1.20.15-gke.3600
    • 1.21.10-gke.1500
    • 1.22.7-gke.1500
    • 1.23.4-gke.1500

    A recent feature of release channels allows you to apply a patch without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your specific release channel.

    Medium

    GKE on VMware

    Updated: 2022-04-22

    Description Severity

    A security vulnerability, CVE-2022-23648, has been discovered in containerd's handling of path traversal in the OCI image volume specification. Containers launched through containerd's CRI implementation with a specially-crafted image configuration could gain full read access to arbitrary files and directories on the host.

    This vulnerability may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy). This vulnerability affects all GKE on VMware with stackdriver enabled, which uses containerd. GKE on VMware versions 1.8, 1.9, and 1.10 are affected

    What should I do?

    2022-04-22 Update: The following versions of GKE on VMware contain code that fixes this vulnerability.

    • 1.9.5 or later
    • 1.10.3 or later
    • 1.11.0 or later

    The following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on VMware versions:

    • 1.8.8 or later
    • 1.9.5 or later
    • 1.10.2 or later

    This CVE can be mitigated by setting IgnoreImageDefinedVolumes to true.

    Medium

    GKE on AWS

    Description Severity

    A security vulnerability, CVE-2022-23648, has been discovered in containerd's handling of path traversal in the OCI image volume specification. Containers launched through containerd's CRI implementation with a specially-crafted image configuration could gain full read access to arbitrary files and directories on the host.

    This vulnerability may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy). All GKE on AWS versions are affected.

    What should I do?

    The following versions of GKE on AWS have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following GKE on AWS versions.

    GKE on AWS (current generation)
    • Version 1.22: 1.22.8-gke.200
    • Version 1.21: 1.21.11-gke.100
    GKE on AWS (previous generation)
    • Version 1.22: 1.22.8-gke.300
    • Version 1.21: 1.21.11-gke.100
    • Version 1.20: 1.20.15-gke.2200

    This CVE can be mitigated by setting IgnoreImageDefinedVolumes to true.

    Medium

    GKE on Azure

    Description Severity

    A security vulnerability, CVE-2022-23648, has been discovered in containerd's handling of path traversal in the OCI image volume specification. Containers launched through containerd's CRI implementation with a specially-crafted image configuration could gain full read access to arbitrary files and directories on the host.

    This vulnerability may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy). All GKE on Azure versions are affected.

    What should I do?

    The following versions of GKE on Azure have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes as follows:

    • Version 1.22: 1.22.8-gke.200
    • Version 1.21: 1.21.11-gke.100

    This CVE can be mitigated by setting IgnoreImageDefinedVolumes to true.

    Medium

    Google Distributed Cloud Virtual for Bare Metal

    Updated: 2022-04-22

    Description Severity

    A security vulnerability, CVE-2022-23648, has been discovered in containerd's handling of path traversal in the OCI image volume specification. Containers launched through containerd's CRI implementation with a specially-crafted image configuration could gain full read access to arbitrary files and directories on the host.

    This vulnerability may bypass any policy-based enforcement on container setup (including a Kubernetes Pod Security Policy). This vulnerability affects all Google Distributed Cloud Virtual for Bare Metal which use containerd. Google Distributed Cloud Virtual for Bare Metal versions 1.8, 1.9, and 1.10 are affected

    What should I do?

    2022-04-22 Update: The following versions of Google Distributed Cloud Virtual for Bare Metal contain code that fixes this vulnerability.

    • 1.8.9 or later
    • 1.9.6 or later
    • 1.10.3 or later
    • 1.11.0 or later

    The following versions of Google Distributed Cloud Virtual for Bare Metal have been updated with code to fix this vulnerability. We recommend that you upgrade your nodes to one of the following Google Distributed Cloud Virtual for Bare Metal versions:

    • 1.8.8 or later
    • 1.9.5 or later
    • 1.10.2 or later

    This CVE can be mitigated by setting IgnoreImageDefinedVolumes to true.

    Medium

    GCP-2022-012

    Published: 2022-04-07
    Updated: 2022-11-22
    Reference: CVE-2022-0847
    2022-11-22 Update: Updated information about workloads using GKE Sandbox.

    GKE

    Updated: 2022-11-22

    Description Severity

    2022-11-22 update: Workloads using GKE Sandbox are not affected by these vulnerabilities.


    A security vulnerability, CVE-2022-0847, has been discovered in the Linux kernel version 5.8 and later that can potentially escalate container privileges to root. This vulnerability affects all GKE node pool versions v1.22 and later that use Container-Optimized OS images (Container-Optimized OS 93 and later). GKE node pools that use the Ubuntu OS are not affected.

    What should I do?

    The versions of Linux node images for the following versions of GKE have been updated with code to fix this vulnerability. For security purposes, even if you have node-autoupgrade enabled, we recommend that you manually upgrade your node pools to one of the following GKE versions:

    • 1.22.7-gke.1500 and later
    • 1.23.4-gke.1600 and later

    A recent feature of release channels allows you to apply a patch version of other release channels without having to unsubscribe from a channel. This lets you secure your nodes until the new version becomes the default for your release specific channel.

    What vulnerabilities are addressed by this patch?

    CVE-2022-0847 relates to the PIPE_BUF_FLAG_CAN_MERGE flag that was introduced in version 5.8 of the Linux kernel. In this vulnerability, the "flags" member of the new pipe buffer structure was lacking proper initialization in the Linux kernel. An unprivileged local attacker can use this flaw to write to pages in the page cache backed by read only files and escalate their privileges.

    New versions of Container-Optimized OS that fix this issue have been integrated into the updated node pool versions of GKE.

    High

    GKE on VMware

    Description Severity

    A security vulnerability, CVE-2022-0847, has been discovered in the Linux kernel version 5.8 and later that can potentially escalate privileges to root. This vulnerability affects GKE on VMware v1.10 for Container-Optimized OS images. Currently, GKE on VMware with Ubuntu is on kernel version 5.4 and is not vulnerable to this attack.

    What should I do?

    The versions of Linux node images for the following versions of GKE on VMware have been updated with code to fix this vulnerability. We recommend that you upgrade your admin and user clusters to the following GKE on VMware version:

    • 1.10.3

    What vulnerabilities are addressed by this patch?

    CVE-2022-0847 relates to the PIPE_BUF_FLAG_CAN_MERGE flag that was introduced in version 5.8 of the Linux kernel. In this vulnerability, the "flags" member of the new pipe buffer structure was lacking proper initialization in the Linux kernel. An unprivileged local attacker can use this flaw to write to pages in the page cache backed by read only files and escalate their privileges.

    New versions of Container-Optimized OS that fix this issue have been integrated into the updated versions of GKE on VMware.

    High

    GKE on AWS

    Description Severity

    A security vulnerability, CVE-2022-0847, has been discovered in the Linux kernel version 5.8 and later that can potentially escalate privileges to root.

    This vulnerability affects managed clusters of GKE on AWS v1.21 and clusters running on GKE on AWS (previous generation) v1.19, v1.20, v1.21, which use Ubuntu.

    What should I do?

    The versions of Linux node images for the following versions of GKE on AWS have been updated with code to fix this vulnerability.

    For managed GKE on AWS, we recommend that you upgrade your user clusters and nodepool to one of the following versions:

    • 1.21.11-gke.100

    For k-lite GKE on AWS, we recommend that you upgrade your AWSManagementService, AWSCluster and AWSNodePool objects to the following version:

    • 1.21.11-gke.100
    • 1.20.15-gke.2200

    What vulnerabilities are addressed by this patch?

    CVE-2022-0847 relates to the PIPE_BUF_FLAG_CAN_MERGE flag that was introduced in version 5.8 of the Linux kernel. In this vulnerability, the "flags" member of the new pipe buffer structure was lacking proper initialization in the Linux kernel. An unprivileged local attacker can use this flaw to write to pages in the page cache backed by read only files and escalate their privileges.

    High

    GKE on Azure

    Description Severity

    A security vulnerability, CVE-2022-0847, has been discovered in the Linux kernel version 5.8 and later that can potentially escalate privileges to root. This vulnerability affects managed clusters of GKE on Azure v1.21 which use Ubuntu.

    What should I do?

    The versions of Linux node images for the following versions of GKE on Azure have been updated with code to fix this vulnerability. We recommend that you upgrade your user clusters and nodepool to the following version:

    • 1.21.11-gke.100

    What vulnerabilities are addressed by this patch?

    CVE-2022-0847 relates to the PIPE_BUF_FLAG_CAN_MERGE flag that was introduced in version 5.8 of the Linux kernel. In this vulnerability, the "flags" member of the new pipe buffer structure was lacking proper initialization in the Linux kernel. An unprivileged local attacker can use this flaw to write to pages in the page cache backed by read only files and escalate their privileges.

    High

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity

    A security vulnerability, CVE-2022-0847, has been discovered in the Linux kernel version 5.8 and later that can potentially escalate privileges to root.

    What should I do?

    There is no action required. Google Distributed Cloud Virtual for Bare Metal is not affected by this CVE as it does not include Linux as part of its package. You should ensure that the node images you use are updated to versions that contain the fix for CVE-2022-0847.

    High

    GCP-2022-011

    Published: 2022-03-22
    Updated: 2022-08-11

    2022-08-11 Update: Added more details about the effects of the SMT misconfiguration.

    GKE

    Description Severity

    Update 2022-08-11: Added more information about the Simultaneous Multi-Threading (SMT) configuration. SMT was intended to be disabled, but was enabled on the versions listed.

    If you manually enabled SMT for a sandboxed node pool, SMT will remain manually enabled despite this issue.


    There is a misconfiguration with Simultaneous Multi-Threading (SMT), also known as Hyper-threading, on GKE Sandbox images. The misconfiguration leaves nodes potentially exposed to side channel attacks such as Microarchitectural Data Sampling (MDS) (for more context, see GKE Sandbox documentation). We do not recommend using the following affected versions:

    • 1.22.4-gke.1501
    • 1.22.6-gke.300
    • 1.23.2-gke.300
    • 1.23.3-gke.600

    If you manually enabled SMT for a node pool, then this issue does not affect your sandboxed nodes.

    What should I do?

    Upgrade your nodes to one of the following versions:

    • 1.22.6-gke.1500 and later
    • 1.23.3-gke.1100 and later

    What vulnerability is addressed by this patch?

    GKE Sandbox nodes have SMT disabled by default, mitigating side-channel attacks.

    Medium

    GCP-2022-009

    Published: 2022-03-01
    Updated: 2022-03-15

    GKE

    Description Severity

    Update 2022-03-15: Added hardening guides for GKE on AWS and GKE on Azure. Added a section on persistence using webhooks.


    Some unexpected paths to access the node VM on GKE Autopilot clusters could have been used to escalate privileges in the cluster. These issues have been fixed and no further action is required. The fixes address issues reported through our Vulnerability Reward Program.

    GKE Standard and GKE clusters users can optionally apply a similar hardening policy as described below.

    Technical details

    Host access using third party policy exemptions

    In order to allow Google Cloud to offer full management of nodes, and a Pod-level SLA, GKE Autopilot restricts some highly privileged Kubernetes primitives to limit workloads from having low-level access to the node VM. To set this in context: GKE Standard presents full access to the underlying compute, Autopilot presents limited access, and Cloud Run presents no access.

    Autopilot relaxes some of those restrictions for a predefined list of third party tools to allow customers to run those tools on Autopilot without modification. Using privileges to create pods with host path mounts, the researcher was able to run a privileged container in a pod that looked like one of these allowlisted third party tools to gain access to the host.

    The ability to schedule pods in this way is expected on GKE Standard, but not on GKE Autopilot, as it bypassed the host-access restrictions used to enable the SLA described previously.

    This issue was fixed by tightening the third party allow-listing pod specification.

    Privilege escalation from root-on-node

    In addition to the host access, the stackdriver-metadata-agent-cluster-level and the metrics-server pods were identified as highly privileged. After gaining root-level access to the node, these services could be used to gain further control over the cluster.

    We have deprecated and removed the stackdriver-metadata-agent for both GKE Standard and Autopilot. This component is still in use on GKE on VMware and Google Distributed Cloud Virtual for Bare Metal.

    As a system hardening measure to prevent this type of attack in the future, we'll apply an Autopilot constraint in an upcoming release that prevents updates to the service account of various objects in the kube-system namespace. We developed a Gatekeeper policy for you to apply similar protection to GKE Standard clusters and GKE clusters to prevent privileged workload self-modification. This policy is applied automatically for Autopilot clusters. For instructions, refer to the following hardening guides:


    Addition 2022-03-15: Persistence using mutating webhooks

    Mutating webhooks were used in the report to establish a privileged foothold in the cluster post-compromise. These are standard parts of the Kubernetes API created by cluster admins, and were made visible to administrators when Autopilot added support for customer-defined webhooks.


    Privileged service accounts in the default namespace

    Autopilot policy enforcers previously allowlisted two service accounts in the default namespace: csi-attacher and otelsvc to give the service accounts special privileges. An attacker with high privileges, including permissions to create ClusterRoleBinding objects and with access to create pods in the default namespace, could use these service account names to access those additional privileges. These services were moved under the kube-system namespace to get the protection of existing Autopilot policy. GKE Standard clusters and GKE clusters are unaffected.

    What should I do?

    All GKE Autopilot clusters have had their policies updated to remove the unintended host access and no further action is required.

    Further policy hardening will be applied to Autopilot in the coming weeks as a secondary protection. No action is required.

    GKE Standard clusters and GKE clusters are unaffected as users already have access to the host. As a system hardening measure, GKE Standard clusters and GKE clusters users can apply similar protection with a Gatekeeper policy that prevents privileged workload self-modification. For instructions, refer to the following hardening guides:

    Low

    GCP-2022-008

    Published: 2022-02-23
    Updated: 2022-04-28
    Reference: CVE-2022-23606, CVE-2022-21655, CVE-2021-43826, CVE-2021-43825, CVE-2021-43824, CVE-2022-21654, CVE-2022-21657, CVE-2022-21656

    GKE

    Description Severity
    The Envoy project recently discovered a set of vulnerabilities, CVE-2022-23606, CVE-2022-21655, CVE-2021-43826, CVE-2021-43825, CVE-2021-43824, CVE-2022-21654, CVE-2022-21657, and CVE-2022-21656 which may impact GKE clusters using Anthos Service Mesh, Istio-on-GKE, or custom Istio deployments.
    All issues listed below are fixed in Envoy release 1.21.1.
    Technical Background
    Additional details for these vulnerabilities are available here.

    What should I do?

    GKE clusters running Anthos Service Mesh should upgrade to a supported version with fix to the above vulnerabilities
    • If you're using Anthos Service Mesh 1.12, upgrade to v1.12.4-asm.0.
    • If you're using Anthos Service Mesh 1.11, upgrade to v1.11.7-asm.1.
    • If you're using Anthos Service Mesh 1.10, upgrade to v1.10.6-asm.1.
    If you're using Anthos Service Mesh v1.9 or below, your release has reached end of life and is no longer supported. These CVE fixes have not been backported. You should upgrade to ASM 1.10 or above.

    GKE clusters running Istio-on-GKE should upgrade to a supported version with fix to the above vulnerabilities
    • If you're using Istio-on-GKE 1.6, upgrade to v1.6.14-gke.8.
    • If you're using Istio-on-GKE 1.4.11, upgrade to v1.4.11-gke.4.
    • If you're using Istio-on-GKE 1.4.10, upgrade to v1.4.10-gke.23.
    • If you are using GKE 1.22 or higher, please use Istio GKE 1.4.10. Otherwise, use Istio-on-GKE 1.4.11.

    What vulnerabilities are addressed by this patch?

    CVE-2022-23606, CVE-2022-21655, CVE-2021-43826, CVE-2021-43825, CVE-2021-43824, CVE-2022-21654, CVE-2022-21657, and CVE-2022-21656
    High

    GKE on VMware

    Updated: 2022-04-28

    Description Severity
    Envoy recently released multiple security vulnerability fixes. GKE on VMware is impacted because Envoy is used with metrics-server. The Envoy CVEs we are fixing are listed below. We will update this bulletin with specific versions when they're available:
    • CVE-2021-43824 (CVSS score 6.5, Medium): Potential null pointer dereference when using JWT filter safe_regex match.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use JWT filter regex.
    • CVE-2021-43825 (CVSS score 6.1, Medium): Use-after-free when response filters increase response data, and increased data exceeds downstream buffer limits.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a decompress filter.
    • CVE-2021-43826 (CVSS score 6.1, Medium): Use-after-free when tunneling TCP over HTTP, if downstream disconnects during upstream connection establishment.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a tunneling filter.
    • CVE-2022-21654 (CVSS score 7.3, High): Incorrect configuration handling allows mTLS session reuse without re-validation after validation settings have changed.
      Note: All ASM/Istio-on-GKE services using mTLS are impacted by this CVE.
    • CVE-2022-21655 (CVSS score 7.5, High): Incorrect handling of internal redirects to routes with a direct response entry.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a direct response filter.
    • CVE-2022-23606 (CVSS score 4.4, Medium): Stack exhaustion when a cluster is deleted via Cluster Discovery Service.
      Note: ASM 1.11+ are impacted by this CVE. ASM 1.10 and All Istio-on-GKE are not impacted by this CVE.
    • CVE-2022-21657 (CVSS Score 3.1, Low): Envoy through 1.20.1 contains a remotely exploitable vulnerability due to X.509 Extended Key Usage and Trust Purposes bypass.
    • CVE-2022-21656 (CVSS Score 3.1, Low): Envoy through 1.20.1 contains a remotely exploitable vulnerability due to X.509 subjectAltName matching (and nameConstraints) bypass.

    Istio recently released one security vulnerability fix. Anthos on VMware is impacted because Istio is used for ingress. The Istio CVEs we are fixing are listed below. We will update this bulletin with specific versions when they're available:

    CVE-2022-23635 (CVSS score 7.5, High): Istiod crashes upon receiving requests with a specially crafted `authorization` header.


    For the full descriptions and impacts of the above CVEs, please refer to the security bulletins.

    2022-04-28 Addition: What should I do?

    The following versions of GKE on VMware fix these vulnerabilities:

    • 1.9.5
    • 1.10.3
    • 1.11.0

    What vulnerabilities are addressed by this patch?

    CVE-2022-23606, CVE-2022-21655, CVE-2021-43826, CVE-2021-43825, CVE-2021-43824, CVE-2022-21654, CVE-2022-21657, and CVE-2022-21656
    High

    Google Distributed Cloud Virtual for Bare Metal

    Description Severity
    Envoy recently released multiple security vulnerability fixes. Anthos on Bare metal is impacted because Envoy is used for metrics-server. The Envoy CVEs we are fixing in release 1.10.3, 1.9.6, and 1.8.9 are listed below:
    • CVE-2021-43824 (CVSS score 6.5, Medium): Potential null pointer dereference when using JWT filter safe_regex match.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use JWT filter regex.
    • CVE-2021-43825 (CVSS score 6.1, Medium): Use-after-free when response filters increase response data, and increased data exceeds downstream buffer limits.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a decompress filter.
    • CVE-2021-43826 (CVSS score 6.1, Medium): Use-after-free when tunneling TCP over HTTP, if downstream disconnects during upstream connection establishment.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a tunneling filter.
    • CVE-2022-21654 (CVSS score 7.3, High): Incorrect configuration handling allows mTLS session reuse without re-validation after validation settings have changed.
      Note: All ASM/Istio-on-GKE services using mTLS are impacted by this CVE.
    • CVE-2022-21655 (CVSS score 7.5, High): Incorrect handling of internal redirects to routes with a direct response entry.
      Note: Although ASM/Istio-on-GKE do not support Envoy filters, you could be impacted if you use a direct response filter.
    • CVE-2022-23606 (CVSS score 4.4, Medium): Stack exhaustion when a cluster is deleted via Cluster Discovery Service.
      Note: ASM 1.11+ are impacted by this CVE. ASM 1.10 and All Istio-on-GKE are not impacted by this CVE.
    • CVE-2022-21657 (CVSS Score 3.1, Low): Envoy through 1.20.1 contains a remotely exploitable vulnerability due to X.509 Extended Key Usage and Trust Purposes bypass.
    • CVE-2022-21656 (CVSS Score 3.1, Low): Envoy through 1.20.1 contains a remotely exploitable vulnerability due to X.509 subjectAltName matching (and nameConstraints) bypass.
    Istio recently released one security vulnerability fix. Anthos on Bare metal is impacted because Istio is used for ingress. The Istio CVE we are fixing in release 1.10.3, 1.9.6, and 1.8.9 is listed below:

    • CVE-2022-23635 (CVSS score 7.5, High): Istiod crashes upon receiving requests with a specially crafted `authorization` header.
      Note: All ASM/Istio-on-GKE are impacted by this CVE.

    For the full descriptions and impacts of the above CVEs, please refer to the security bulletins.

    What vulnerabilities are addressed by this patch?

    CVE-2022-23606, CVE-2022-21655, CVE-2021-43826, CVE-2021-43825, CVE-2021-43824, CVE-2022-21654, CVE-2022-21657, and CVE-2022-21656
    High

    GCP-2022-006

    Published: 2022-02-14
    Updated: 2022-05-16
    2022-05-16 Update: Added GKE version 1.19.16-gke.7800 or later to the list of versions that have code to fix this vulnerability.
    2022-05-12 Update: Updated patch versions for GKE, Google Distributed Cloud Virtual for Bare Metal, GKE on VMware, and GKE on AWS. Fixed an issue where the security bulletin for GKE on AWS was not displayed when it was added on 2022-02-23.

    GKE

    Description Severity

    A security vulnerability, CVE-2022-0492, has been discovered in the Linux kernel's cgroup_release_agent_write function. The attack uses unprivileged user namespaces and under certain circumstances this vulnerability can be exploitable for container breakout.

    What should I do?

    2022-05-16 Update: In addition to the GKE versions mentioned in the 2022-05-12 update, GKE version 1.19.16-gke.7800 or later also contains code that fixes this vulnerability.


    2022-05-12 Update: The following versions of GKE contain code that fixes this vulnerability:

    • 1.20.15-gke.5600 or later
    • 1.21.11-gke.1500 or later
    • 1.22.8-gke.1800 or later
    • 1.23.5-gke.1800 or later

    Update 2022-02-15: Corrected gVisor statement.

    The vulnerability is found in the Linux kernel's cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function and can be used as a container breakout. GKE is unaffected due to protection from the default AppArmor profile on Ubuntu and COS. However, some customers may still be vulnerable if they have loosened security restrictions on pods through modification of the Pod or container securityContext field e.g. by disabling/changing the AppArmor profile, which is not recommended. In addition to the default AppArmor profile, these features also protect against the vulnerability:

    • GKE Autopilot is unaffected due to the default seccomp profile.
    • Update 2022-02-15: gVisor (GKE Sandbox) is unaffected as gVisor doesn't allow access to the vulnerable system call on the host.

    Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerability is addressed by this patch?

    CVE-2022-0492

    Low

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2022-0492, has been discovered in the Linux kernel's cgroup_release_agent_write function. The attack uses unprivileged user namespaces and under certain circumstances this vulnerability can be exploitable for container breakout.

    What should I do?

    2022-05-12 Update: The following versions of GKE on VMware contain code that fixes this vulnerability.

    COS
    • 1.8.8 or later
    • 1.9.5 or later
    • 1.10.2 or later
    • 1.11.0 or later
    Ubuntu
    • 1.9.6 or later
    • 1.10.3 or later
    • 1.11.0 or later

    The vulnerability is found in the Linux kernel's cgroup_release_agent_write in the kernel/cgroup/cgroup-v1.c function and can be used as a container breakout. GKE on VMware are unaffected due to protection from the default AppArmor profile on Ubuntu and COS. However, some customers may still be vulnerable if they have loosened security restrictions on pods through modification of the Pod or container securityContext field e.g. by disabling/changing the AppArmor profile, which is not recommended.

    Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerability is addressed by this patch?

    CVE-2022-0492

    Low

    GKE on AWS

    Description Severity

    A security vulnerability, CVE-2022-0492, has been discovered in the Linux kernel's cgroup_release_agent_write function. The attack uses unprivileged user namespaces and under certain circumstances this vulnerability can be exploitable for container breakout.

    What should I do?

    2022-05-12 Update: The following versions of current and previous generation GKE on AWS contain code that fixes this vulnerability:

    Current generation
    • 1.21.11-gke.1100
    • 1.22.8-gke.1300
    Previous generation
    • 1.22.8-gke.1300
    • 1.21.11-gke.1100
    • 1.20.15-gke.5200

    Update 2022-02-23: Added note for GKE on AWS.

    GKE on AWS previous and current generations are unaffected due to protection from the default AppArmor profile on Ubuntu. However, some customers may still be vulnerable if they have loosened security restrictions on pods through modification of the Pod or container securityContext field e.g. by disabling/changing the AppArmor profile, which is not recommended.

    Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerability is addressed by this patch?

    CVE-2022-0492

    Low

    GKE Enterprise on

    Description Severity

    A security vulnerability, CVE-2022-0492, has been discovered in the Linux kernel's cgroup_release_agent_write function. The attack uses unprivileged user namespaces and under certain circumstances this vulnerability can be exploitable for container breakout.

    What should I do?

    2022-05-12 Update: The following versions of GKE on Azure contain code that fixes this vulnerability:

    • 1.21.11-gke.1100
    • 1.22.8-gke.1300

    GKE on Azure are unaffected due to protection from the default AppArmor profile on Ubuntu. However, some customers may still be vulnerable if they have loosened security restrictions on pods through modification of the Pod or container securityContext field e.g. by disabling/changing the AppArmor profile, which is not recommended.

    Patches will be available in an upcoming release. This bulletin will be updated when they are available.

    What vulnerability is addressed by this patch?

    CVE-2022-0492

    Low

    GCP-2022-005

    Published: 2022-02-11
    Updated: 2022-02-15
    Reference: CVE-2021-43527

    GKE

    Description Severity
    Update 2022-02-15: Some GKE versions mentioned in the original bulletin were combined with other fixes and had their version numbers incremented prior to release. Patches are available in the following GKE versions:
    • 1.20.15-gke.300
    • 1.21.9-gke.300
    • 1.22.6-gke.1000

    A security vulnerability, CVE-2021-43527, has been discovered in any binary that links to the vulnerable versions of libnss3 found in NSS (Network Security Services) versions prior to 3.73 or 3.68.1. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how NSS is used/configured. Both GKE COS and Ubuntu images have a vulnerable version installed, and need to be patched.

    Potentially, CVE-2021-43527 can have a wide impact across applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS#7, or PKCS#12. As well as applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted. Impact depends on how NSS is used/configured.

    GKE doesn't use libnss3 for any Internet-accessible APIs. The impact is limited to on-host code running outside containers, which is small due to the minimal design of Chrome OS. GKE code running inside containers using the golang distroless base image is unaffected.

    What should I do?

    The versions of Linux node images for the following versions of GKE have been updated with code to fix these vulnerabilities. Upgrade your control plane and nodes to one of the following GKE versions:

    • 1.18 version to be determined
    • 1.19.16-gke.6100
    • 1.20.15-gke.200
    • 1.21.9-gke.200
    • 1.22.6-gke.600
    • 1.23.3-gke.500
    Are you using a GKE version older than 1.18? You are using a GKE version out of SLA and should consider upgrading to one of the supported versions.

    What vulnerability is addressed by this patch?

    CVE-2021-43527

    Medium

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2021-43527, has been discovered in any binary that links to the vulnerable versions of libnss3 found in NSS (Network Security Services) versions prior to 3.73 or 3.68.1. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how they configure NSS. Both GKE on VMware COS and Ubuntu images have a vulnerable version installed, and need to be patched.

    Potentially, CVE-2021-43527 can have a wide impact across with applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS \#7, or PKCS \#12. As well as applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted. Impact depends on how they configure/use NSS. Anthos on VMware doesn't use libnss3 for any publicly accessible APIs, therefore the impact is limited and this CVE's severity for GKE on VMware is rated as Medium.

    What should I do?

    The versions of Linux node images for the following versions of Anthos have been updated with code to fix these vulnerabilities. Upgrade your control plane and nodes to one of the following Anthos versions:

    • 1.8.7
    • 1.9.4
    • 1.10.2

    Are you using an GKE on VMware version older than 1.18? You are using an Anthos version out of SLA and should consider upgrading to one of the supported versions.

    What vulnerability is addressed by this patch?

    CVE-2021-43527

    Medium

    GKE Enterprise on

    Description Severity

    A security vulnerability, CVE-2021-43527, has been discovered in any binary that links to the vulnerable versions of libnss3 found in NSS (Network Security Services) versions prior to 3.73 or 3.68.1. Applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted, depending on how NSS is used/configured. Anthos clusters on Azure Ubuntu images have a vulnerable version installed, and need to be patched.

    Potentially, CVE-2021-43527 can have a wide impact across with applications using NSS for handling signatures encoded within CMS, S/MIME, PKCS#7, or PKCS#12. As well as applications using NSS for certificate validation or other TLS, X.509, OCSP or CRL functionality may be impacted. Impact depends on how they configure/use NSS. Anthos clusters on Azure doesn't use libnss3 for any publicly accessible APIs, therefore the impact is limited and this CVE's severity for Anthos on Azure is rated as Medium.

    What should I do?

    The versions of Linux node images for the following versions of GKE on Azure have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following Anthos on Azure versions:

    • v1.21.6-gke.1500

    What vulnerability is addressed by this patch?

    CVE-2021-43527

    Medium

    GCP-2022-004

    Published: 2022-02-04
    Reference: CVE-2021-4034

    GKE

    Description Severity

    A security vulnerability, CVE-2021-4034, has been discovered in pkexec, a part of the Linux policy kit package (polkit), that allows an authenticated user to perform a privilege escalation attack. PolicyKit is generally used only on Linux desktop systems to allow non-root users to perform actions such as rebooting the system, installing packages, restarting services etc, as governed by a policy.

    What should I do?

    GKE is unaffected because the vulnerable module, policykit-1, is not installed on COS or Ubuntu images used in GKE. No action is required.

    None

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2021-4034, has been discovered in pkexec, a part of the Linux policy kit package (polkit), that allows an authenticated user to perform a privilege escalation attack. PolicyKit is generally used only on Linux desktop systems to allow non-root users to perform actions such as rebooting the system, installing packages, restarting services etc, as governed by a policy.

    The GKE Enterprise default configuration already gives users full "sudo" privileges, so this exploit does not change GKE Enterprise existing security posture

    Technical details

    For this bug to be exploitable, an attacker needs both a non-root shell on the node filesystem and to have the vulnerable version of pkexec installed. While GKE on VMware does include a version of policykit-1 in its release images, the GKE Enterprise default configuration allows passwordless sudo to anyone with shell access already, so this vulnerability does not give a user any more privileges than they already have.

    What should I do?

    No action is required. GKE on VMware is unaffected.

    None

    GKE clusters on

    Description Severity
    GKE on AWS is unaffected. The vulnerable module, policykit-1, is not installed on Ubuntu images used by the current and previous versions of GKE on AWS. None

    GKE Enterprise on

    Description Severity

    A security vulnerability, CVE-2021-4034, has been discovered in pkexec, a part of the Linux policy kit package (polkit), that allows an authenticated user to perform a privilege escalation attack. PolicyKit is generally used only on Linux desktop systems to allow non-root users to perform actions such as rebooting the system, installing packages, restarting services etc, as governed by a policy.

    The GKE Enterprise default configuration already gives users full "sudo" privileges, so this exploit does not change GKE Enterprise existing security posture

    Technical details

    For this bug to be exploitable, an attacker needs both a non-root shell on the node filesystem and to have the vulnerable version of pkexec installed. While GKE on Azure does include a version of policykit-1 in its release images, the GKE Enterprise default configuration allows passwordless sudo to anyone with shell access already, so this vulnerability does not give a user any more privileges than they already have.

    What should I do?

    No action is required. GKE on Azure is unaffected.

    None

    GKE clusters on

    Description Severity
    Google Distributed Cloud Virtual for Bare Metal might be affected depending on packages that are installed on the customer-managed operating system. Scan your OS images and patch them if necessary. None

    GCP-2022-002

    Published: 2022-02-01
    Updated: 2022-03-07
    Reference:
    CVE-2021-4154, CVE-2021-22600, CVE-2022-0185
    2022-02-04 Update: Added sections for GKE on AWS and GKE on Azure. Added rollout updates for GKE and GKE on VMware.

    GKE

    Updated: 2022-03-07

    Description Severity

    Three security vulnerabilities, CVE-2021-4154, CVE-2021-22600, and CVE-2022-0185, have been discovered in the Linux kernel, each of which can lead to either a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all node operating systems (COS and Ubuntu) on GKE, GKE on VMware, GKE on AWS (current and previous generation), and GKE on Azure.

    Pods using GKE Sandbox are not vulnerable to these vulnerabilities.

    See the COS release notes for more details.

    Technical details

    In CVE-2021-4154, an attacker can exploit the fsconfig system call parameter to trigger a use-after-free bug in the linux kernel, resulting in getting root privileges. This is a local privilege escalation attack that will lead to a container breakout.

    CVE-2021-22600 is a double free exploit in packet_set_ring that can lead to a container escape to the host node.

    With CVE-2022-0185, a heap overflow bug in legacy_parse_param() may lead to an out-of-bounds write that will cause a container breakout.

    The exploitation path for this vulnerability that relies on the "unshare" syscall is blocked on GKE Autopilot clusters by default using seccomp filtering.

    Users who have manually enabled the default container runtime seccomp profile on GKE Standard clusters are also protected.

    What should I do?

    2022-03-07 Update:The versions of Linux node images for the following versions of GKE have been updated with code to fix all these vulnerabilities for both Ubuntu and COS images. Upgrade your control plane and nodes to one of the following GKE versions.

    • 1.18.20-gke.6101
    • 1.19.16-gke.8300
    • 1.20.15-gke.2500
    • 1.21.10-gke.400
    • 1.22.7-gke.900
    • 1.23.3-gke.1100

    2022-02-25 Update:If you use Ubuntu node images, 1.22.6-gke.1000 does not address CVE-2021-22600. We will update this bulletin with Ubuntu patch versions when they are available.


    2022-02-23 Update: The versions of Linux node images for the following versions of GKE have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following GKE versions.

    • 1.18.20-gke.6101
    • 1.22.6-gke.1000
    • 1.23.3-gke.1100

    2022-02-04 Update: The rollout start date for GKE patch versions was February 2.


    The versions of Linux node images for the following versions of GKE have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following GKE versions.

    • 1.19.16-gke.6100
    • 1.20.15-gke.300
    • 1.21.9-gke.300

    1.22 and 1.23 versions are also in progress. We will update this bulletin with specific versions when they're available.

    What vulnerability is addressed by this patch?

    High

    GKE clusters on

    Updated: 2022-02-23

    Description Severity

    Three security vulnerabilities, CVE-2021-4154, CVE-2021-22600, and CVE-2022-0185, have been discovered in the Linux kernel, each of which can lead to either a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all node operating systems (COS and Ubuntu) on GKE, GKE on VMware, GKE on AWS (current and previous generation), and GKE on Azure.

    See the COS release notes for more details.

    Technical details

    In CVE-2021-4154, an attacker can exploit the fsconfig system call parameter to trigger a use-after-free bug in the linux kernel, resulting in getting root privileges. This is a local privilege escalation attack that will lead to a container breakout.

    CVE-2021-22600 is a double free exploit in packet_set_ring that can lead to a container escape to the host node.

    With CVE-2022-0185, a heap overflow bug in legacy_parse_param() may lead to an out-of-bounds write that will cause a container breakout.

    Users who have manually enabled the default container runtime seccomp profile on GKE Standard clusters are also protected.

    What should I do?

    2022-02-23 Update: version 1.10.2 (Fixes CVE-2021-22600, CVE-2021-4154, and CVE-2022-0185) is now scheduled for March 1.

    2022-02-23 Update: Added patched versions addressing CVE-2021-2260.

    Version 1.10.1 does not address CVE-2021-22600 but does address the other vulnerabilities. Versions 1.9.4 and 1.10.2, both unreleased, will address CVE-2021-22600. The versions of Linux node images for the following versions of GKE on VMware have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following GKE on VMware versions:

    • 1.10.1 (Fixes CVE-2021-4154 and CVE-2022-0185. Released February 10)
    • 1.8.7 (Fixes CVE-2021-22600, CVE-2021-4154, and CVE-2022-0185. Released February 17)
    • 1.9.4 (Fixes CVE-2021-22600, CVE-2021-4154, and CVE-2022-0185. Released February 23)
    • 1.10.2 (Fixes CVE-2021-22600, CVE-2021-4154, and CVE-2022-0185. Scheduled for February 24)

    2022-02-04 Update: Added information about Ubuntu images not addressing CVE-2021-22600.

    The versions of Linux node images for the following versions of GKE on VMware have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following GKE on VMware versions:

    • 1.10.1 (COS update only. Ubuntu patch will be in 1.10.2-scheduled for February 23)
    • 1.9.4 (scheduled for February 15)
    • 1.8.7 (scheduled for February 15)

    What vulnerability is addressed by this patch?

    High

    GKE clusters on

    Description Severity

    Three security vulnerabilities, CVE-2021-4154, CVE-2021-22600, and CVE-2022-0185, have been discovered in the Linux kernel, each of which can lead to either a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all node operating systems (COS and Ubuntu) on GKE, GKE on VMware, GKE on AWS (current and previous generation), and GKE on Azure.

    See the COS release notes for more details.

    Technical details

    In CVE-2021-4154, an attacker can exploit the fsconfig system call parameter to trigger a use-after-free bug in the linux kernel, resulting in getting root privileges. This is a local privilege escalation attack that will lead to a container breakout.

    CVE-2021-22600 is a double free exploit in packet_set_ring that can lead to a container escape to the host node.

    With CVE-2022-0185, a heap overflow bug in legacy_parse_param() may lead to an out-of-bounds write that will cause a container breakout.

    Users who have manually enabled the default container runtime seccomp profile on GKE Standard clusters are also protected.

    What should I do?

    GKE on AWS

    The versions of Linux node images for the following versions of GKE on AWS have been updated with code to fix these vulnerabilities. Upgrade your clusters to the following GKE on AWS version:

    • 1.21.6-gke.1500 and later (available in February)

    GKE on AWS (previous generation)

    The versions of Linux node images for the following versions of GKE on AWS (previous generation) have been updated with code to fix these vulnerabilities. Upgrade your clusters to one of the following GKE on AWS (previous generation) versions:

    • 1.19.16-gke.5300
    • 1.20.14-gke.2000
    • 1.21.8-gke.2000

    What vulnerability is addressed by this patch?

    High

    GKE Enterprise on

    Description Severity

    Three security vulnerabilities, CVE-2021-4154, CVE-2021-22600, and CVE-2022-0185, have been discovered in the Linux kernel, each of which can lead to either a container breakout, privilege escalation on the host, or both. These vulnerabilities affect all node operating systems (COS and Ubuntu) on GKE, GKE on VMware, GKE on AWS (current and previous generation), and GKE on Azure.

    See the COS release notes for more details.

    Technical details

    In CVE-2021-4154, an attacker can exploit the fsconfig system call parameter to trigger a use-after-free bug in the linux kernel, resulting in getting root privileges. This is a local privilege escalation attack that will lead to a container breakout.

    CVE-2021-22600 is a double free exploit in packet_set_ring that can lead to a container escape to the host node.

    With CVE-2022-0185, a heap overflow bug in legacy_parse_param() may lead to an out-of-bounds write that will cause a container breakout.

    Users who have manually enabled the default container runtime seccomp profile on GKE Standard clusters are also protected.

    What should I do?

    The versions of Linux node images for the following versions of GKE on Azure have been updated with code to fix these vulnerabilities. Upgrade your clusters to the following GKE on Azure version:

    • 1.21.6-gke.1500 and later (available in February)

    What vulnerability is addressed by this patch?

    High

    GCP-2021-024

    Published: 2021-10-21
    Reference: CVE-2021-25742

    GKE

    Description Severity

    A security issue was discovered in the Kubernetes ingress-nginx controller, CVE-2021-25742. Ingress-nginx custom snippets allows retrieval of ingress-nginx service account tokens and secrets across all namespaces.

    What should I do?

    This security issue does not impact your GKE cluster infrastructure or any GKE Enterprise environments cluster infrastructure. If you use ingress-nginx in your workload deployments, you should be aware of this security issue. See ingress-nginx Issue 7837 for more details.

    None

    GKE clusters on

    Description Severity

    A security issue was discovered in the Kubernetes ingress-nginx controller, CVE-2021-25742. Ingress-nginx custom snippets allows retrieval of ingress-nginx service account tokens and secrets across all namespaces.

    What should I do?

    This security issue does not impact your GKE cluster infrastructure or any GKE Enterprise environments cluster infrastructure. If you use ingress-nginx in your workload deployments, you should be aware of this security issue. See ingress-nginx Issue 7837 for more details.

    None

    GKE clusters on

    Description Severity

    A security issue was discovered in the Kubernetes ingress-nginx controller, CVE-2021-25742. Ingress-nginx custom snippets allows retrieval of ingress-nginx service account tokens and secrets across all namespaces.

    What should I do?

    This security issue does not impact your GKE cluster infrastructure or any GKE Enterprise environments cluster infrastructure. If you use ingress-nginx in your workload deployments, you should be aware of this security issue. See ingress-nginx Issue 7837 for more details.

    None

    GKE clusters on

    Description Severity

    A security issue was discovered in the Kubernetes ingress-nginx controller, CVE-2021-25742. Ingress-nginx custom snippets allows retrieval of ingress-nginx service account tokens and secrets across all namespaces.

    What should I do?

    This security issue does not impact your GKE cluster infrastructure or any GKE Enterprise environments cluster infrastructure. If you use ingress-nginx in your workload deployments, you should be aware of this security issue. See ingress-nginx Issue 7837 for more details.

    None

    GCP-2021-019

    Published: 2021-09-29

    GKE

    Description Severity

    There is a known issue where updating a BackendConfig resource using the v1beta1 API that removes an active Google Cloud Armor security policy from its service.

    Am I impacted?

    If your BackendConfig has already been updated with the v1beta1 API, your Google Cloud Armor security policy might have been removed. To determine if this has happened, run the following command:

    kubectl get backendconfigs -A -o json | \
    jq -r '.items[] | select(.spec.securityPolicy == {}) | .metadata | "\(.namespace)/\(.name)"'
    • If the response returns output: your cluster is impacted by the issue. The output of this command returns a list of BackendConfig resources (<namespace>/<name>) that are affected by the issue.
    • If the output is empty: your BackendConfig has not been updated using the v1beta1 API since the issue has been introduced. Any future updates to your BackendConfig should only use v1.

    This issue affects the following GKE versions:

    • 1.18.19-gke.1400 to 1.18.20-gke.5100 (exclusive)
    • 1.19.10-gke.700 to 1.19.14-gke.300 (exclusive)
    • 1.20.6-gke.700 to 1.20.9-gke.900 (exclusive)
    • 1.21 to 1.21.1-gke.2700 (exclusive)

    If you do not configure Google Cloud Armor on your Ingress resources via the BackendConfig, then this issue does not affect your clusters.

    What should I do?

    Upgrade your GKE control plane to one of the following updated versions that patches this issue and allows v1beta1 BackendConfig resources to be used safely:

    • 1.21.1-gke.2700 and later
    • 1.20.9-gke.900 and later
    • 1.19.14-gke.300 and later
    • 1.18.20-gke.5100 and later

    This issue can also be prevented by avoiding the deployment of v1beta1 BackendConfig resources. If you configure Google Cloud Armor on your Ingress resources via the BackendConfig and you've found that you're impacted through the steps above, re-enable Google Cloud Armor by pushing an update to your current BackendConfig resource with the cloud.google.com/v1 API version.

    To prevent this issue, only make updates to your BackendConfig using the v1 BackendConfig API.

    Since the v1 BackendConfig supports all the same fields as v1beta1 and makes no breaking changes, the API field can be updated transparently. To do so, replace the apiVersion field of any active BackendConfig manifest with cloud.google.com/v1 and do not use cloud.google.com/v1beta1.

    The following sample manifest describes a BackendConfig resource that uses the v1API:

    apiVersion: cloud.google.com/v1
    kind: BackendConfig
    metadata:
      name: my-backend-config
    spec:
      securityPolicy:
        name: "ca-how-to-security-policy"
    

    If you have CI/CD systems or tools which regularly update BackendConfig resources, ensure that you are using the cloud.google.com/v1 API group in those systems

    Low

    GCP-2021-022

    Published: 2021-09-23

    GKE clusters on

    Description Severity

    A vulnerability has been discovered in the GKE Enterprise Identity Service (AIS) LDAP module of GKE on VMware versions 1.8 and 1.8.1 where a seed key used in generating keys is predictable. With this vulnerability, an authenticated user could add arbitrary claims and escalate privileges indefinitely.

    Technical details

    A recent addition to AIS code creates symmetric keys using golang's math/rand module, which is not suitable for security-sensitive code. The module is used in a way that will generate a predictable key. During identity verification, a secure token service (STS) key is generated that is subsequently encrypted with a symmetric key that is simple to derive.

    What should I do?

    This vulnerability only affects customers using AIS in GKE on VMware versions 1.8 and 1.8.1. For users of GKE on VMware 1.8, upgrade your clusters to the following version:

    • 1.8.2
    High

    GCP-2021-021

    Published: 2021-09-22
    Reference: CVE-2020-8561

    GKE

    Description Severity

    A security vulnerability, CVE-2020-8561, has been discovered in Kubernetes where certain webhooks can be made to redirect kube-apiserver requests to private networks of that API server.

    Technical details

    With this vulnerability, actors who control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the API server. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

    This issue can be mitigated by changing certain parameters for the API server.

    What should I do?

    No action is required at this time.

    Currently available versions of GKE and GKE Enterprise have implemented the following mitigations that protect against this type of attack:

    • The --profiling flag for kube-apiserver is set to false.
    • The kube-apiserver log level is set below 10.

    What vulnerability is addressed by this patch?

    CVE-2020-8561

    Medium

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2020-8561, has been discovered in Kubernetes where certain webhooks can be made to redirect kube-apiserver requests to private networks of that API server.

    Technical details

    With this vulnerability, actors who control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the API server. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

    This issue can be mitigated by changing certain parameters for the API server.

    What should I do?

    No action is required at this time.

    Currently available versions of GKE and GKE Enterprise have implemented the following mitigations that protect against this type of attack:

    • The --profiling flag for kube-apiserver is set to false.
    • The kube-apiserver log level is set below 10.

    What vulnerability is addressed by this patch?

    CVE-2020-8561

    Medium

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2020-8561, has been discovered in Kubernetes where certain webhooks can be made to redirect kube-apiserver requests to private networks of that API server.

    Technical details

    With this vulnerability, actors who control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the API server. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

    This issue can be mitigated by changing certain parameters for the API server.

    What should I do?

    No action is required at this time.

    Currently available versions of GKE and GKE Enterprise have implemented the following mitigations that protect against this type of attack:

    • The --profiling flag for kube-apiserver is set to false.
    • The kube-apiserver log level is set below 10.

    What vulnerability is addressed by this patch?

    CVE-2020-8561

    Medium

    GKE clusters on

    Description Severity

    A security vulnerability, CVE-2020-8561, has been discovered in Kubernetes where certain webhooks can be made to redirect kube-apiserver requests to private networks of that API server.

    Technical details

    With this vulnerability, actors who control the responses of MutatingWebhookConfiguration or ValidatingWebhookConfiguration requests are able to redirect kube-apiserver requests to private networks of the API server. If that user can view kube-apiserver logs when the log level is set to 10, they can view the redirected responses and headers in the logs.

    This issue can be mitigated by changing certain parameters for the API server.

    What should I do?

    No action is required at this time.

    Currently available versions of GKE and GKE Enterprise have implemented the following mitigations that protect against this type of attack:

    • The --profiling flag for kube-apiserver is set to false.
    • The kube-apiserver log level is set below 10.

    What vulnerability is addressed by this patch?

    CVE-2020-8561

    Medium

    GCP-2021-018

    Published: 2021-09-15
    Updated: 2021-09-24
    Reference: CVE-2021-25741

    2021-09-24 update: GKE on Bare Metal bulletin updated with additional patched versions.

    2021-09-20 update: Bulletins added for GKE on Bare Metal

    2021-09-16 update: Bulletins added for GKE on VMware


    GKE

    Description Severity

    A security issue was discovered in Kubernetes, CVE-2021-25741, where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

    Technical details:

    In CVE-2021-25741, the attacker can create a symbolic link from a mounted emptyDir to the root filesystem of the node ( / ), the kubelet will follow the symlink and mount the host root into the container.

    What should I do?

    We recommend you to upgrade your node pools to one of the following versions or above to take advantage of the latest patches:

    • 1.21.4-gke.301
    • 1.20.10-gke.301
    • 1.19.14-gke.301
    • 1.18.20-gke.4501

    The following versions also contain the fix:

    • 1.21.3-gke.2001
    • 1.20.8-gke.2101
    • 1.20.9-gke.701
    • 1.20.9-gke.1001
    • 1.19.12-gke.2101
    • 1.19.13-gke.701
    • 1.18.20-gke.3001
    High

    GKE clusters on

    Description Severity

    A security issue was discovered in Kubernetes, CVE-2021-25741, where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

    Technical details:

    In CVE-2021-25741, the attacker can create a symbolic link from a mounted emptyDir to the root filesystem of the node ( / ), the kubelet will follow the symlink and mount the host root into the container.

    What should I do?

    Updated 2021-09-24: Patched versions 1.8.3 and 1.7.4 are now available.

    Updated 2021-09-17: Corrected the list of available versions that contain the patch.


    The following versions of GKE on VMware have been updated with code to fix this vulnerability. Upgrade your admin clusters and user clusters to one of the following versions:

    • 1.8.3
    • 1.8.2
    • 1.7.4
    • 1.6.5
    High

    GKE clusters on

    Description Severity

    A security issue was discovered in Kubernetes, CVE-2021-25741, where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

    Technical details:

    In CVE-2021-25741, the attacker can create a symbolic link from a mounted emptyDir to the root filesystem of the node ( / ), the kubelet will follow the symlink and mount the host root into the container.

    What should I do?

    2021-9-16 Update: Added list of supported gke-versions for AWSCluster and AWSNodePool objects.


    The following versions of GKE on AWS have been updated with code to fix this vulnerability. It is recommended that you:

    • Upgrade your AWSManagementService, AWSCluster and AWSNodePool objects to the following version:
      • 1.8.2
    • Update the gke-version of your AWSCluster and AWSNodePool objects to one of the supported Kubernetes versions:
      • 1.17.17-gke.15800
      • 1.18.20-gke.4800
      • 1.19.14-gke.600
      • 1.20.10-gke.600
    High

    GKE clusters on

    Description Severity

    A security issue was discovered in Kubernetes, CVE-2021-25741, where a user may be able to create a container with subpath volume mounts to access files & directories outside of the volume, including on the host filesystem.

    Technical details:

    In CVE-2021-25741, the attacker can create a symbolic link from a mounted emptyDir to the root filesystem of the node ( / ), the kubelet will follow the symlink and mount the host root into the container.

    What should I do?

    The following versions of GKE on Bare Metal have been updated with code to fix this vulnerability. Upgrade your admin clusters and user clusters to one of the following versions:

    • 1.8.3
    • 1.7.4
    High

    GCP-2021-017

    Published: 2021-09-01
    Updated: 2021-09-23
    Reference: CVE-2021-33909
    CVE-2021-33910

    GKE

    Description Severity
    2021-09-23 update:

    Containers running inside of GKE Sandbox are unaffected by this vulnerability for attacks originating inside the container.


    2021-09-15 update:

    The following GKE versions address the vulnerabilities:

    • 1.18.20-gke.4100
    • 1.19.13-gke.1900
    • 1.20.9-gke.1500
    • 1.21.3-gke.1400

    Two security vulnerabilities, CVE-2021-33909 and CVE-2021-33910, have been discovered in the Linux kernel that can lead to an OS crash or an escalation to root by an unprivileged user. This vulnerability affects all GKE node operating systems (COS and Ubuntu).

    Technical details:

    In CVE-2021-33909, the Linux kernel's filesystem layer does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root.
    With CVE-2021-33910, systemd has a memory allocation with an excessive size value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

    What should I do?

    The versions of Linux node images for the following versions of GKE have been updated with code to fix this vulnerability. Upgrade your clusters to one of the following versions:

    • 1.18.20-gke.4100
    • 1.19.13-gke.1900
    • 1.20.9-gke.1500
    • 1.21.3-gke.1400
    High

    GKE clusters on

    Description Severity

    Two security vulnerabilities, CVE-2021-33909 and CVE-2021-33910, have been discovered in the Linux kernel that can lead to an OS crash or an escalation to root by an unprivileged user. This vulnerability affects all GKE node operating systems (COS and Ubuntu).

    Technical details:

    In CVE-2021-33909, the Linux kernel's filesystem layer does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root.
    With CVE-2021-33910, systemd has a memory allocation with an excessive size value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

    What should I do?

    The versions of Linux node images for GKE on AWS have been updated with code to fix this vulnerability. Upgrade your clusters to one of the following versions:

    • 1.20.10-gke.600
    • 1.19.14-gke.600
    • 1.18.20-gke.4800
    • 1.17.17-gke.15800
    High

    GKE clusters on

    Description Severity

    Two security vulnerabilities, CVE-2021-33909 and CVE-2021-33910, have been discovered in the Linux kernel that can lead to an OS crash or an escalation to root by an unprivileged user. This vulnerability affects all GKE node operating systems (COS and Ubuntu).

    Technical details:

    In CVE-2021-33909, the Linux kernel's filesystem layer does not properly restrict seq buffer allocations, leading to an integer overflow, an Out-of-bounds Write, and escalation to root.
    With CVE-2021-33910, systemd has a memory allocation with an excessive size value (involving strdupa and alloca for a pathname controlled by a local attacker) that results in an operating system crash.

    What should I do?

    The versions of Linux and COS node images for GKE on VMware have been updated with code to fix this vulnerability. Upgrade your clusters to one of the following versions:

    • 1.9
    • 1.8.2
    • 1.7.3
    • 1.6.4 (Linux only)

    See Version history--Kubernetes and node kernel versions.

    High

    GCP-2021-015

    Published: 2021-07-13
    Updated: 2021-07-15
    Reference: CVE-2021-22555

    GKE

    Description Severity

    A new security vulnerability, CVE-2021-22555, has been discovered where a malicious actor with CAP_NET_ADMIN privileges can potentially cause a container breakout to root on the host. This vulnerability affects all GKE clusters and GKE on VMware running Linux version 2.6.19 or later.

    Technical details

    In this attack, an out-of-bounds write in setsockopt in the netfilter subsystem in Linux can allow a heap corruption (and therefore denial of service) and escalation of privileges.

    What should I do?

    The following versions of Linux on GKE have been updated with code to fix this vulnerability. Upgrade your clusters to one of the following versions:

    • 1.21.1-gke.2200
    • 1.20.7-gke.2200
    • 1.19.11-gke.2100
    • 1.18.20-gke.501

    What vulnerability is addressed by this patch?

    CVE-2021-22555

    High

    GKE clusters on

    Description Severity

    A new security vulnerability, CVE-2021-22555, has been discovered where a malicious actor with CAP_NET_ADMIN privileges can potentially cause a container breakout to root on the host. This vulnerability affects all GKE clusters and GKE on VMware running Linux version 2.6.19 or later.

    Technical details

    In this attack, an out-of-bounds write in setsockopt in the netfilter subsystem in Linux can allow a heap corruption (and therefore denial of service) and escalation of privileges.

    What should I do?

    The following versions of Linux on GKE on VMware have been updated with code to fix this vulnerability. Upgrade your clusters to one of the following versions:

    • 1.8
    • 1.7.3
    • 1.6.4

    What vulnerability is addressed by this patch?

    CVE-2021-22555

    High

    GCP-2021-014

    Published: 2021-07-05
    Reference: CVE-2021-34527

    GKE

    Description Severity

    Microsoft published a security bulletin on a Remote code execution (RCE) vulnerability, CVE-2021-34527, that affects the print spooler in Windows servers. The CERT Coordination Center (CERT/CC) published an update note on a related vulnerability, dubbed "PrintNightmare" that also affects Windows print spoolers - PrintNightmare, Critical Windows Print Spooler Vulnerability

    What should I do?

    No action is required. GKE Windows nodes do not contain the affected Spooler service as part of the base image, so GKE Windows deployments are not vulnerable to this attack.

    What vulnerabilities are addressed by this bulletin?

    High

    GCP-2021-012

    Published: 2021-07-01
    Updated: 2021-07-09
    Reference: CVE-2021-34824

    GKE

    Description Severity

    What should I do?

    The Istio project recently disclosed a new security vulnerability (CVE-2021-34824) affecting Istio. Istio contains a remotely exploitable vulnerability where credentials specified in the Gateway and DestinationRule credentialName field can be accessed from different namespaces.

    Technical details:

    The Istio secure Gateway or workloads using the DestinationRule can load TLS private keys and certificates from Kubernetes secrets via the credentialName configuration. From Istio 1.8 and above, the secrets are read from istiod and conveyed to gateways and workloads via XDS.

    Normally, a gateway or workload deployment is only able to access TLS certificates and private keys stored in the secret within its namespace. However, a bug in istiod allows a client authorized to access the Istio XDS API to retrieve any TLS certificate and private keys cached in istiod.

    What should I do?

    GKE clusters do not run Istio by default and, when enabled, use Istio version 1.6, which is not vulnerable to this attack. If you have installed or upgraded Istio on the cluster to Istio 1.8 or above, upgrade your Istio to the latest supported version.

    High

    GKE clusters on

    Description Severity

    What should I do?

    The Istio project recently disclosed a new security vulnerability (CVE-2021-34824) affecting Istio. Istio contains a remotely exploitable vulnerability where credentials specified in the Gateway and DestinationRule credentialName field can be accessed from different namespaces.

    Technical details:

    The Istio secure Gateway or workloads using the DestinationRule can load TLS private keys and certificates from Kubernetes secrets via the credentialName configuration. From Istio 1.8 and above, the secrets are read from istiod and conveyed to gateways and workloads via XDS.

    Normally, a gateway or workload deployment is only able to access TLS certificates and private keys stored in the secret within its namespace. However, a bug in istiod allows a client authorized to access the Istio XDS API to retrieve any TLS certificate and private keys cached in istiod.

    What should I do?

    Anthos clusters on VMware v1.6 and v1.7 are not vulnerable to this attack. Anthos clusters on VMware v1.8 are vulnerable.

    If you are using Anthos clusters on VMware v1.8, upgrade to the following patched version or later:

    • 1.8.0-gke.25
    High

    GKE clusters on

    Description Severity

    What should I do?

    The Istio project recently disclosed a new security vulnerability (CVE-2021-34824) affecting Istio. Istio contains a remotely exploitable vulnerability where credentials specified in the Gateway and DestinationRule credentialName field can be accessed from different namespaces.

    Technical details:

    The Istio secure Gateway or workloads using the DestinationRule can load TLS private keys and certificates from Kubernetes secrets via the credentialName configuration. From Istio 1.8 and above, the secrets are read from istiod and conveyed to gateways and workloads via XDS.

    Normally, a gateway or workload deployment is only able to access TLS certificates and private keys stored in the secret within its namespace. However, a bug in istiod allows a client authorized to access the Istio XDS API to retrieve any TLS certificate and private keys cached in istiod. Clusters created or upgraded with Anthos clusters on bare metal v1.8.0 are impacted by this CVE.

    What should I do?

    Anthos v1.6 and 1.7 are not vulnerable to this attack. If you have v1.8.0 clusters, download and install the 1.8.1 version of bmctl and upgrade your clusters to the following patched version:

    • 1.8.1
    High

    GCP-2021-011

    Published: 2021-06-04
    Updated: 2021-10-19
    Reference: CVE-2021-30465

    2021-10-19 update: Added bulletins for GKE on VMware, GKE on AWS, and GKE on Bare Metal.

    GKE

    Description Severity

    The security community recently disclosed a new security vulnerability (CVE-2021-30465) found in runc that has the potential to allow full access to a node filesystem.

    For GKE, because exploiting this vulnerability requires the ability to create pods, we have rated the severity of this vulnerability at MEDIUM.

    Technical details

    The runc package is vulnerable to a symlink exchange attack when mounting a volume.

    For this specific attack, a user can potentially exploit a race condition by starting multiple pods on a single node simultaneously, all of which share the same volume mount with a symlink.

    If the attack succeeds, one of the pods will mount the node's filesystem with root permissions.

    What should I do?

    There is a newly released patch to runc (1.0.0-rc95) that fixes this vulnerability.

    Upgrade your GKE cluster to one of the following updated versions:

    • 1.18.19-gke.2100
    • 1.19.9-gke.1400
    • 1.20.6-gke.1400
    • 1.21.2-gke.600

    Medium

    GKE clusters on

    Description Severity

    The security community recently disclosed a new security vulnerability (CVE-2021-30465) found in runc that has the potential to allow full access to a node filesystem.

    For GKE on VMware, because exploiting this vulnerability requires the ability to create pods, we have rated the severity of this vulnerability at MEDIUM.

    Technical details

    The runc package is vulnerable to a symlink exchange attack when mounting a volume.

    For this specific attack, a user can potentially exploit a race condition by starting multiple pods on a single node simultaneously, all of which share the same volume mount with a symlink.

    If the attack succeeds, one of the pods will mount the node's filesystem with root permissions.

    What should I do?

    There is a newly released patch to runc that fixes this vulnerability. Upgrade your GKE on VMware to one of the following versions:

    • 1.7.3-gke-2
    • 1.8.1-gke.7
    • 1.9.0-gke.8

    Medium

    GKE clusters on

    Description Severity

    The security community recently disclosed a new security vulnerability (CVE-2021-30465) found in runc that has the potential to allow full access to a node filesystem.

    Because this is an OS-level vulnerability, GKE on AWS are not vulnerable.

    Technical details

    The runc package is vulnerable to a symlink exchange attack when mounting a volume.

    For this specific attack, a user can potentially exploit a race condition by starting multiple pods on a single node simultaneously, all of which share the same volume mount with a symlink.

    If the attack succeeds, one of the pods will mount the node's filesystem with root permissions.

    What should I do?

    Ensure that the OS version on which you are running GKE on AWS is upgraded to the latest OS version that has an updated runc package.

    None

    GKE clusters on

    Description Severity

    The security community recently disclosed a new security vulnerability (CVE-2021-30465) found in runc that has the potential to allow full access to a node filesystem.

    Because this is an OS-level vulnerability, GKE on Bare Metal are not vulnerable.

    Technical details

    The runc package is vulnerable to a symlink exchange attack when mounting a volume.

    For this specific attack, a user can potentially exploit a race condition by starting multiple pods on a single node simultaneously, all of which share the same volume mount with a symlink.

    If the attack succeeds, one of the pods will mount the node's filesystem with root permissions.

    What should I do?

    Ensure that the OS version on which you are running Google Distributed Cloud Virtual for Bare Metal is upgraded to the latest OS version that has an updated runc package.

    None

    GCP-2021-006

    Published: 2021-05-11
    Reference: CVE-2021-31920

    GKE

    Description Severity

    The Istio project recently disclosed a new security vulnerability (CVE-2021-31920) affecting Istio.

    Istio contains a remotely-exploitable vulnerability where an HTTP request with multiple slashes or escaped slash characters can bypass Istio authorization policy when path based authorization rules are used.

    What should I do?

    We strongly recommend that you update and reconfigure your GKE clusters. Please note it is important to complete both steps below to successfully resolve the vulnerability:

    1. Update your clusters: Please complete the following instructions to upgrade your clusters to the newest patch versions as soon as possible:
      • If you are using Istio on GKE 1.6:

        The newest patch release version is 1.6.14-gke.3. Please follow the upgrade instructions to upgrade your clusters to the newest version.

      • If you are using Istio on GKE 1.4:
      • Istio on GKE 1.4 releases are no longer supported by Istio and we do not backport CVE fixes to these versions. Please follow the Istio upgrade instructions to upgrade your clusters to 1.6, then follow the above instructions to get the newest version of Istio on GKE 1.6.

    2. Configure Istio:

      Once your clusters are patched, you must reconfigure Istio on GKE. Please refer to the security best practices guide to correctly configure your system.

    High

    GCP-2021-004

    Published: 2021-05-06
    Reference: CVE-2021-28683, CVE-2021-28682, CVE-2021-29258

    GKE

    Description Severity

    The Envoy and Istio projects recently announced several new security vulnerabilities (CVE-2021-28683, CVE-2021-28682 and CVE-2021-29258), that could allow an attacker to crash Envoy.

    GKE clusters do not run Istio by default and are not vulnerable. If Istio has been installed in a cluster and configured to expose services to the internet, those services may be vulnerable to denial of service.

    What should I do?

    To fix these vulnerabilities, upgrade your GKE control plane to one of the following patched versions:

    • 1.16.15-gke.16200
    • 1.17.17-gke.6100
    • 1.18.17-gke.1300
    • 1.19.9-gke.1300
    • 1.20.5-gke.1400
    Medium

    GKE clusters on

    Description Severity

    The Envoy and Istio projects recently announced several new security vulnerabilities (CVE-2021-28683, CVE-2021-28682 and CVE-2021-29258), that could allow an attacker to crash Envoy.

    GKE on VMware use Envoy by default for Ingress, so Ingress services may be vulnerable to denial of service.

    What should I do?

    To fix these vulnerabilities, upgrade your GKE on VMware to one of the following patched versions when released:

    • 1.5.4
    • 1.6.3
    • 1.7.1
    Medium

    GKE clusters on

    Updated: 2021-05-06

    Description Severity

    The Envoy and Istio projects recently announced several new security vulnerabilities (CVE-2021-28683, CVE-2021-28682 and CVE-2021-29258), that could allow an attacker to crash Envoy.

    Google Distributed Cloud Virtual for Bare Metal uses Envoy by default for Ingress, so Ingress services may be vulnerable to denial of service.

    What should I do?

    To fix these vulnerabilities, upgrade your Google Distributed Cloud Virtual for Bare Metal cluster to one of the following patched versions when released:

    • 1.6.3
    • 1.7.1
    Medium

    GCP-2021-003

    Published: 2021-04-19
    Reference: CVE-2021-25735

    GKE

    Description Severity

    The Kubernetes project recently announced a new security vulnerability, CVE-2021-25735, that could allow node updates to bypass a Validating Admission Webhook.

    In a scenario where an attacker has sufficient privileges and where a Validating Admission Webhook is implemented that uses old Node object properties (for example fields in Node.NodeSpec), the attacker could update properties of a node that could lead to a cluster compromise. None of the policies enforced by GKE and Kubernetes built-in admission controllers are affected, but we recommend customers check any additional admission webhooks they have installed.

    What should I do?

    To fix this vulnerability, upgrade your GKE cluster to one of the following patched versions:

    • 1.18.17-gke.900
    • 1.19.9-gke.900
    • 1.20.5-gke.900
    Medium

    GKE clusters on

    Description Severity

    The Kubernetes project recently announced a new security vulnerability, CVE-2021-25735, that could allow node updates to bypass a Validating Admission Webhook.

    In a scenario where an attacker has sufficient privileges and where a Validating Admission Webhook is implemented that uses old Node object properties (for example fields in Node.NodeSpec), the attacker could update properties of a node that could lead to a cluster compromise. None of the policies enforced by GKE and Kubernetes built-in admission controllers are affected, but we recommend customers check any additional admission webhooks they have installed.

    What should I do?

    An upcoming patch version will include a mitigation for this vulnerability.

    Medium

    GKE clusters on

    Description Severity

    The Kubernetes project recently announced a new security vulnerability, CVE-2021-25735, that could allow node updates to bypass a Validating Admission Webhook.

    In a scenario where an attacker has sufficient privileges and where a Validating Admission Webhook is implemented that uses old Node object properties (for example fields in Node.NodeSpec), the attacker could update properties of a node that could lead to a cluster compromise. None of the policies enforced by GKE and Kubernetes built-in admission controllers are affected, but we recommend customers check any additional admission webhooks they have installed.

    What should I do?

    An upcoming patch version will include a mitigation for this vulnerability.

    Medium

    GKE clusters on

    Description Severity

    The Kubernetes project recently announced a new security vulnerability, CVE-2021-25735, that could allow node updates to bypass a Validating Admission Webhook.

    In a scenario where an attacker has sufficient privileges and where a Validating Admission Webhook is implemented that uses old Node object properties (for example fields in Node.NodeSpec), the attacker could update properties of a node that could lead to a cluster compromise. None of the policies enforced by GKE and Kubernetes built-in admission controllers are affected, but we recommend customers check any additional admission webhooks they have installed.

    What should I do?

    An upcoming patch version will include a mitigation for this vulnerability.

    Medium

    GCP-2021-001

    Published: 2021-01-28
    Reference: CVE-2021-3156

    GKE

    Description Severity

    A vulnerability was recently discovered in the Linux utility sudo, described in CVE-2021-3156, that may allow an attacker with unprivileged local shell access on a system with sudo installed to escalate their privileges to root on the system.

    Google Kubernetes Engine (GKE) clusters are not affected by this vulnerability:

    • Users who are authorized to SSH to GKE nodes are already considered highly privileged and can use sudo to obtain root privileges by design. The vulnerability does not yield any additional privilege escalation paths in this scenario.
    • Most GKE system containers are built from distroless base images which do not have a shell or sudo installed. Other images are built from a debian base image that doesn't contain sudo. Even if sudo was present, access to sudo inside the container does not give you access to the host due to the container boundary.

    What should I do?

    Because GKE clusters are not affected by this vulnerability, no further action is required.

    GKE will have the patch for this vulnerability applied in a coming release at regular cadence.

    None

    GKE clusters on

    Description Severity

    A vulnerability was recently discovered in the Linux utility sudo, described in CVE-2021-3156, that may allow an attacker with unprivileged local shell access on a system with sudo installed to escalate their privileges to root on the system.

    GKE on VMware are not affected by this vulnerability:

    • Users who are authorized to SSH to GKE on VMware nodes are already considered highly privileged and can use sudo to obtain root privileges by design. The vulnerability does not yield any additional privilege escalation paths in this scenario.
    • Most GKE on VMware system containers are built from distroless base images which do not have a shell or sudo installed. Other images are built from a debian base image that doesn't contain sudo. Even if sudo was present, access to sudo inside the container does not give you access to the host due to the container boundary.

    What should I do?

    Because GKE on VMware clusters are not affected by this vulnerability, no further action is required.

    GKE on VMware will have the patch for this vulnerability applied in a coming release at regular cadence.

    None

    GKE clusters on

    Description Severity

    A vulnerability was recently discovered in the Linux utility sudo, described in CVE-2021-3156, that may allow an attacker with unprivileged local shell access on a system with sudo installed to escalate their privileges to root on the system.

    GKE on AWS are not affected by this vulnerability:

    • Users who are authorized to SSH to GKE on AWS nodes are already considered highly privileged and can use sudo to obtain root privileges by design. The vulnerability does not yield any additional privilege escalation paths in this scenario.
    • Most GKE on AWS system containers are built from distroless base images which do not have a shell or sudo installed. Other images are built from a debian base image that doesn't contain sudo. Even if sudo was present, access to sudo inside the container does not give you access to the host due to the container boundary.

    What should I do?

    Because GKE on AWS clusters are not affected by this vulnerability, no further action is required.

    GKE on AWS will have the patch for this vulnerability applied in a coming release at regular cadence.

    None

    GKE clusters on

    Description Severity

    A vulnerability was recently discovered in the Linux utility sudo, described in CVE-2021-3156, that may allow an attacker with unprivileged local shell access on a system with sudo installed to escalate their privileges to root on the system.

    Google Distributed Cloud Virtual for Bare Metal clusters are not affected by this vulnerability:

    • Users who are authorized to SSH to Google Distributed Cloud Virtual for Bare Metal nodes are already considered highly privileged and can use sudo to obtain root privileges by design. The vulnerability does not yield any additional privilege escalation paths in this scenario.
    • Most Google Distributed Cloud Virtual for Bare Metal system containers are built from distroless base images which do not have a shell or sudo installed. Other images are built from a debian base image that doesn't contain sudo. Even if sudo was present, access to sudo inside the container does not give you access to the host due to the container boundary.

    What should I do?

    Because Google Distributed Cloud Virtual for Bare Metal clusters are not affected by this vulnerability, no further action is required.

    Google Distributed Cloud Virtual for Bare Metal will have the patch for this vulnerability applied in a coming release at regular cadence.

    None

    GCP-2020-015

    Published: 2020-12-07
    Updated: 2021-12-22
    Reference: CVE-2020-8554

    2021-12-22 update: Uses gcloud beta instead of the gcloud command.

    2021-12-15 update: Added additional mitigate for GKE.

    GKE

    Description Severity
    Updated: 2021-12-22 The command for GKE in the following section should use gcloud beta instead of the gcloud command.
    gcloud beta container clusters update –no-enable-service-externalips
    

    Updated: 2021-12-15 For GKE, the following mitigation is now available:
    1. Starting in GKE version 1.21, services with ExternalIPs are blocked by a DenyServiceExternalIPs admission controller that is enabled by default for new clusters.
    2. Customers who upgrade to GKE version 1.21 can block services with ExternalIPs using the following command:
      gcloud container clusters update –no-enable-service-externalips
      

    For more information, see Hardening your cluster's security.


    The Kubernetes project recently discovered a new security vulnerability, CVE-2020-8554, that might allow an attacker who has obtained permissions to create a Kubernetes Service of type LoadBalancer or ClusterIP to intercept network traffic originating from other Pods in the cluster.

    This vulnerability by itself does not give an attacker permissions to create a Kubernetes Service.

    All Google Kubernetes Engine (GKE) clusters are affected by this vulnerability.

    What should I do?

    Kubernetes might need to make backwards incompatible design changes in a future version to address the vulnerability.

    If many users share access to your cluster with permissions to create Services, such as in a multi-tenant cluster, consider applying a mitigation in the meantime. For now, the best approach for mitigation is to restrict the use of ExternalIPs in a cluster. ExternalIPs are not a commonly used feature.

    Restrict the use of ExternalIPs in a cluster with one of the following methods:

    1. Use GKE Enterprise Policy Controller or Gatekeeper with this constraint template and apply it. For example:
      # Only allow the creation of Services with no
      # ExternalIP or an ExternalIP of 203.0.113.1:
      
      apiVersion: constraints.gatekeeper.sh/v1beta1
      kind: K8sExternalIPs
      metadata:
        name: external-ips
      spec:
        match:
          kinds:
            - apiGroups: [""]
              kinds: ["Service"]
        parameters:
          allowedIPs:
            - "203.0.113.1"
      
    2. Or install an admission controller to prevent the use of ExternalIPs. The Kubernetes project has provided a sample admission controller for this task.

    As mentioned in the Kubernetes announcement, no mitigation is provided for Services of type LoadBalancer because, by default, only highly privileged users and system components are granted the container.services.updateStatus permission which is required to leverage this vulnerability.

    Medium

    GKE clusters on

    Description Severity
    Updated: 2021-12-22 The command for GKE in the following section should use gcloud beta instead of the gcloud command.
    gcloud beta container clusters update –no-enable-service-externalips
    

    Updated: 2021-12-15 For GKE, the following mitigation is now available:
    1. Starting in GKE version 1.21, services with ExternalIPs are blocked by a DenyServiceExternalIPs admission controller that is enabled by default for new clusters.
    2. Customers who upgrade to GKE version 1.21 can block services with ExternalIPs using the following command:
      gcloud container clusters update –no-enable-service-externalips
      

    For more information, see Hardening your cluster's security.


    The Kubernetes project recently discovered a new security vulnerability, CVE-2020-8554, that might allow an attacker who has obtained permissions to create a Kubernetes Service of type LoadBalancer or ClusterIP to intercept network traffic originating from other Pods in the cluster.

    This vulnerability by itself does not give an attacker permissions to create a Kubernetes Service.

    All GKE on VMware are affected by this vulnerability.

    What should I do?

    Kubernetes might need to make backwards incompatible design changes in a future version to address the vulnerability.

    If many users share access to your cluster with permissions to create Services, such as in a multi-tenant cluster, consider applying a mitigation in the meantime. For now, the best approach for mitigation is to restrict the use of ExternalIPs in a cluster. ExternalIPs are not a commonly used feature.

    Restrict the use of ExternalIPs in a cluster with one of the following methods:

    1. Use GKE Enterprise Policy Controller or Gatekeeper with this constraint template and apply it. For example:
      # Only allow the creation of Services with no
      # ExternalIP or an ExternalIP of 203.0.113.1:
      
      apiVersion: constraints.gatekeeper.sh/v1beta1
      kind: K8sExternalIPs
      metadata:
        name: external-ips
      spec:
        match:
          kinds:
            - apiGroups: [""]
              kinds: ["Service"]
        parameters:
          allowedIPs:
            - "203.0.113.1"
      
    2. Or install an admission controller to prevent the use of ExternalIPs. The Kubernetes project has provided a sample admission controller for this task.

    As mentioned in the Kubernetes announcement, no mitigation is provided for Services of type LoadBalancer because, by default, only highly privileged users and system components are granted the container.services.updateStatus permission which is required to leverage this vulnerability.

    Medium

    GKE clusters on

    Description Severity
    Updated: 2021-12-22 The command for GKE in the following section should use gcloud beta instead of the gcloud command.
    gcloud beta container clusters update –no-enable-service-externalips
    

    Updated: 2021-12-15 For GKE, the following mitigation is now available:
    1. Starting in GKE version 1.21, services with ExternalIPs are blocked by a DenyServiceExternalIPs admission controller that is enabled by default for new clusters.
    2. Customers who upgrade to GKE version 1.21 can block services with ExternalIPs using the following command:
      gcloud container clusters update –no-enable-service-externalips
      

    For more information, see Hardening your cluster's security.


    The Kubernetes project recently discovered a new security vulnerability, CVE-2020-8554, that might allow an attacker who has obtained permissions to create a Kubernetes Service of type LoadBalancer or ClusterIP to intercept network traffic originating from other Pods in the cluster.

    This vulnerability by itself does not give an attacker permissions to create a Kubernetes Service.

    All GKE on AWS are affected by this vulnerability.

    What should I do?

    Kubernetes might need to make backwards incompatible design changes in a future version to address the vulnerability.

    If many users share access to your cluster with permissions to create Services, such as in a multi-tenant cluster, consider applying a mitigation in the meantime. For now, the best approach for mitigation is to restrict the use of ExternalIPs in a cluster. ExternalIPs are not a commonly used feature.

    Restrict the use of ExternalIPs in a cluster with one of the following methods:

    1. Use GKE Enterprise Policy Controller or Gatekeeper with this constraint template and apply it. For example:
      # Only allow the creation of Services with no
      # ExternalIP or an ExternalIP of 203.0.113.1:
      
      apiVersion: constraints.gatekeeper.sh/v1beta1
      kind: K8sExternalIPs
      metadata:
        name: external-ips
      spec:
        match:
          kinds:
            - apiGroups: [""]
              kinds: ["Service"]
        parameters:
          allowedIPs:
            - "203.0.113.1"
      
    2. Or install an admission controller to prevent the use of ExternalIPs. The Kubernetes project has provided a sample admission controller for this task.

    As mentioned in the Kubernetes announcement, no mitigation is provided for Services of type LoadBalancer because, by default, only highly privileged users and system components are granted the container.services.updateStatus permission which is required to leverage this vulnerability.

    Medium

    GCP-2020-014

    Published: 2020-10-20
    Reference: CVE-2020-8563, CVE-2020-8564, CVE-2020-8565, CVE-2020-8566

    GKE

    Updated: 2020-10-20

    Description Severity

    The Kubernetes project recently discovered several issues that allow for the exposure of secret data when verbose logging options are enabled. The issues are:

    • CVE-2020-8563: Secret leaks in logs for vSphere Provider kube-controller-manager
    • CVE-2020-8564: Docker config secrets leaked when file is malformed and loglevel >= 4
    • CVE-2020-8565: Incomplete fix for CVE-2019-11250 in Kubernetes allows for token leak in logs when logLevel >= 9. Discovered by GKE Security.
    • CVE-2020-8566: Ceph RBD adminSecrets exposed in logs when loglevel >= 4

    GKE is not affected.

    What should I do?

    No further action is required due to the default verbosity logging levels of GKE.

    None

    GKE clusters on

    Updated: 2020-10-10

    Description Severity

    The Kubernetes project recently discovered several issues that allow for the exposure of secret data when verbose logging options are enabled. The issues are:

    • CVE-2020-8563: Secret leaks in logs for vSphere Provider kube-controller-manager
    • CVE-2020-8564: Docker config secrets leaked when file is malformed and loglevel >= 4
    • CVE-2020-8565: Incomplete fix for CVE-2019-11250 in Kubernetes allows for token leak in logs when logLevel >= 9. Discovered by GKE Security.
    • CVE-2020-8566: Ceph RBD adminSecrets exposed in logs when loglevel >= 4

    GKE on VMware is not affected.

    What should I do?

    No further action is required due to the default verbosity logging levels of GKE.

    None

    GKE clusters on

    Updated: 2020-10-20

    Description Severity

    The Kubernetes project recently discovered several issues that allow for the exposure of secret data when verbose logging options are enabled. The issues are:

    • CVE-2020-8563: Secret leaks in logs for vSphere Provider kube-controller-manager
    • CVE-2020-8564: Docker config secrets leaked when file is malformed and loglevel >= 4
    • CVE-2020-8565: Incomplete fix for CVE-2019-11250 in Kubernetes allows for token leak in logs when logLevel >= 9. Discovered by GKE Security.
    • CVE-2020-8566: Ceph RBD adminSecrets exposed in logs when loglevel >= 4

    GKE on AWS is not affected.

    What should I do?

    No further action is required due to the default verbosity logging levels of GKE.

    None

    GCP-2020-012

    Published: 2020-09-14
    Reference: CVE-2020-14386

    GKE

    Description Severity

    A vulnerability was recently discovered in the Linux kernel, described in CVE-2020-14386, that may allow container escape to obtain root privileges on the host node.

    All GKE nodes are affected. Pods running in GKE Sandbox are not able to leverage this vulnerability.

    What should I do?

    To fix this vulnerability, upgrade your control plane, and then your nodes to one of the patched versions listed below:

    • 1.14.10-gke.50
    • 1.15.12-gke.20
    • 1.16.13-gke.401
    • 1.17.9-gke.1504
    • 1.18.6-gke.3504

    Exploiting this vulnerability requires CAP_NET_RAW, but very few containers typically require CAP_NET_RAW. This and other powerful capabilities should be blocked by default through PodSecurityPolicy or Policy Controller:

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigates the following vulnerability:

    The vulnerability CVE-2020-14386, which allows containers with CAP_NET_RAW to write 1 to 10 bytes of kernel memory, and possibly escape the container and obtain root privileges on the host node. This is rated as a High severity vulnerability.

    High

    GKE clusters on

    Updated: 2020-09-17

    Description Severity

    A vulnerability was recently discovered in the Linux kernel, described in CVE-2020-14386, that may allow container escape to obtain root privileges on the host node.

    All GKE on VMware nodes are affected.

    What should I do?

    To fix this vulnerability, upgrade your cluster to a patched version. The following upcoming {gke_on_prem_name}} versions will contain the fix for this vulnerability, and this bulletin will be updated when they are available:

    • GKE on VMware 1.4.3, now available.
    • GKE on VMware 1.3.4, now available.

    Exploiting this vulnerability requires CAP_NET_RAW, but very few containers typically require CAP_NET_RAW. This and other powerful capabilities should be blocked by default through PodSecurityPolicy or Policy Controller:

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigates the following vulnerability:

    The vulnerability CVE-2020-14386, which allows containers with CAP_NET_RAW to write 1 to 10 bytes of kernel memory, and possibly escape the container and obtain root privileges on the host node. This is rated as a High severity vulnerability.

    High

    GKE clusters on

    Updated: 2020-10-13

    Description Severity

    A vulnerability was recently discovered in the Linux kernel, described in CVE-2020-14386, that may allow container escape to obtain root privileges on the host node.

    All GKE on AWS nodes are affected.

    What should I do?

    To fix this vulnerability, upgrade your management service and your user clusters to a patched version. The following upcoming GKE on AWS versions or newer will include the fix for this vulnerability, and this bulletin will be updated when they are available:

    • 1.5.0-gke.6
    • 1.4.3-gke.7

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigates the following vulnerability:

    The vulnerability CVE-2020-14386, which allows containers with CAP_NET_RAW to write 1 to 10 bytes of kernel memory, and possibly escape the container and obtain root privileges on the host node. This is rated as a High severity vulnerability.

    High

    GCP-2020-011

    Published: 2020-07-24
    Reference: CVE-2020-8558

    GKE

    Description Severity

    A networking vulnerability, CVE-2020-8558, was recently discovered in Kubernetes. Services sometimes communicate with other applications running inside the same Pod using the local loopback interface (127.0.0.1). This vulnerability allows an attacker with access to the cluster's network to send traffic to the loopback interface of adjacent Pods and nodes. Services that rely on the loopback interface not being accessible outside their Pod could be exploited.

    Exploiting this vulnerability on GKE clusters requires an attacker to have network administrator privileges on the Google Cloud hosting the cluster's VPC. This vulnerability alone does not give an attacker network administrator privileges. For this reason, this vulnerability has been assigned a Low severity for GKE.

    What should I do?

    To fix this vulnerability, upgrade your cluster's node pools to the following GKE versions (and later):

    • 1.17.7-gke.0
    • 1.16.11-gke.0
    • 1.16.10-gke.11
    • 1.16.9-gke.14

    What vulnerability is addressed by this patch?

    This patch fixes the following vulnerability: CVE-2020-8558.

    Low

    GKE clusters on

    Description Severity

    A networking vulnerability, CVE-2020-8558, was recently discovered in Kubernetes. Services sometimes communicate with other applications running inside the same Pod using the local loopback interface (127.0.0.1). This vulnerability allows an attacker with access to the cluster's network to send traffic to the loopback interface of adjacent Pods and nodes. Services that rely on the loopback interface not being accessible outside their Pod could be exploited.

    What should I do?

    To fix this vulnerability, upgrade your cluster to a patched version. The following upcoming GKE on VMware versions or newer contain the fix for this vulnerability:

    • GKE on VMware 1.4.1

    What vulnerability is addressed by this patch?

    This patch fixes the following vulnerability: CVE-2020-8558.

    Medium

    GKE clusters on

    Description Severity

    A networking vulnerability, CVE-2020-8558, was recently discovered in Kubernetes. Services sometimes communicate with other applications running inside the same Pod using the local loopback interface (127.0.0.1). This vulnerability allows an attacker with access to the cluster's network to send traffic to the loopback interface of adjacent Pods and nodes. Services that rely on the loopback interface not being accessible outside their Pod could be exploited.

    Exploiting this vulnerability on user clusters requires an attacker to disable source destination checks on the EC2 instances in the cluster. This requires the attacker to have AWS IAM permissions for ModifyInstanceAttribute or ModifyNetworkInterfaceAttribute on the EC2 instances. For this reason, this vulnerability has been assigned a Low severity for GKE on AWS.

    What should I do?

    To fix this vulnerability, upgrade your cluster to a patched version. The following upcoming GKE on AWS versions or newer are expected to include the fix for this vulnerability:

    • GKE on AWS 1.4.1-gke.17

    What vulnerability is addressed by this patch?

    This patch fixes the following vulnerability: CVE-2020-8558.

    Low

    GCP-2020-009

    Published: 2020-07-15
    Reference: CVE-2020-8559

    GKE

    Description Severity

    A privilege escalation vulnerability, CVE-2020-8559, was recently discovered in Kubernetes. This vulnerability allows an attacker that has already compromised a node to execute a command in any Pod in the cluster. The attacker can thereby use the already compromised node to compromise other nodes and potentially read information, or cause destructive actions.

    Note that for an attacker to exploit this vulnerability, a node in your cluster must have already been compromised. This vulnerability, by itself, will not compromise any nodes in your cluster.

    What should I do?

    Upgrade your cluster to a patched version. Clusters will be auto-upgraded over the next weeks, and patched versions will be available by July 19, 2020 for an accelerated manual upgrade schedule. The following GKE control plane versions or newer contain the fix for this vulnerability:

    • v1.14.10-gke.46
    • v1.15.12-gke.8
    • v1.16.9-gke.11
    • v1.16.10-gke.9
    • v1.16.11-gke.3+
    • v1.17.7-gke.6+

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8559. This is rated as a Medium vulnerability for GKE, as it requires the attacker to have first hand information about the cluster, nodes, and workloads to effectively leverage this attack in addition to an existing compromised node. This vulnerability by itself will not provide an attacker with a compromised node.

    Medium

    GKE clusters on

    Description Severity

    A privilege escalation vulnerability, CVE-2020-8559, was recently discovered in Kubernetes. This vulnerability allows an attacker that has already compromised a node to execute a command in any Pod in the cluster. The attacker can thereby use the already compromised node to compromise other nodes and potentially read information, or cause destructive actions.

    Note that for an attacker to exploit this vulnerability, a node in your cluster must have already been compromised. This vulnerability, by itself, will not compromise any nodes in your cluster.

    What should I do?

    Upgrade your cluster to a patched version. The following upcoming GKE on VMware versions or newer contain the fix for this vulnerability:

    • Anthos 1.3.3
    • Anthos 1.4.1

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8559. This is rated as a Medium vulnerability for GKE, as it requires the attacker to have first hand information about the cluster, nodes, and workloads to effectively leverage this attack in addition to an existing compromised node. This vulnerability by itself will not provide an attacker with a compromised node.

    Medium

    GKE clusters on

    Description Severity

    A privilege escalation vulnerability, CVE-2020-8559, was recently discovered in Kubernetes. This vulnerability allows an attacker that has already compromised a node to execute a command in any Pod in the cluster. The attacker can thereby use the already compromised node to compromise other nodes and potentially read information, or cause destructive actions.

    Note that for an attacker to exploit this vulnerability, a node in your cluster must have already been compromised. This vulnerability, by itself, will not compromise any nodes in your cluster.

    What should I do?

    GKE on AWS GA (1.4.1, available end of July, 2020) or newer includes the patch for this vulnerability. If you are using a previous version, download a new version of the anthos-gke command line tool and recreate your management and user clusters.

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8559. This is rated as a Medium vulnerability for GKE, as it requires the attacker to have first hand information about the cluster, nodes, and workloads to effectively leverage this attack in addition to an existing compromised node. This vulnerability by itself will not provide an attacker with a compromised node.

    Medium

    GCP-2020-007

    Published: 2020-06-01
    Reference: CVE-2020-8555

    GKE

    Description Severity

    Server Side Request Forgery (SSRF) vulnerability, CVE-2020-8555, was recently discovered in Kubernetes, allowing certain authorized users to leak up to 500 bytes of sensitive information from the control plane host network. The Google Kubernetes Engine (GKE) control plane uses controllers from Kubernetes and is thus affected by this vulnerability. We recommend that you upgrade the control plane to the latest patch version, as we detail below. A node upgrade is not required.

    What should I do?

    For most customers, no further action is required. The vast majority of clusters are already running a patched version. The following GKE versions or newer contain the fix for this vulnerability:
    • 1.14.7-gke.39
    • 1.14.8-gke.32
    • 1.14.9-gke.17
    • 1.14.10-gke.12
    • 1.15.7-gke.17
    • 1.16.4-gke.21
    • 1.17.0-gke.0

    Clusters using release channels are already on control plane versions with the mitigation.

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8555. This is rated as a Medium vulnerability for GKE as it was difficult to exploit due to various control plane hardening measures.

    An attacker with permissions to create a Pod with certain built-in Volume types (GlusterFS, Quobyte, StorageFS, ScaleIO) or permissions to create a StorageClass can cause kube-controller-manager to make GET requests or POST requests without an attacker controlled request body from the master's host network. These volume types are rarely used on GKE, so new use of these volume types may be a useful detection signal.

    Combined with a means to leak the results of the GET/POST back to the attacker, such as through logs, this can lead to disclosure of sensitive information. We have updated the storage drivers in question to remove the potential for such leaks.

    Medium

    GKE clusters on

    Description Severity

    Server Side Request Forgery (SSRF) vulnerability, CVE-2020-8555, was recently discovered in Kubernetes, allowing certain authorized users to leak up to 500 bytes of sensitive information from the control plane host network. The Google Kubernetes Engine (GKE) control plane uses controllers from Kubernetes and is thus affected by this vulnerability. We recommend that you upgrade the control plane to the latest patch version, as we detail below. A node upgrade is not required.

    What should I do?

    The following GKE on VMware versions or newer contain the fix for this vulnerability:

    • Anthos 1.3.0

    If you are using a previous version, upgrade your existing cluster to a version containing the fix.

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8555. This is rated as a Medium vulnerability for GKE as it was difficult to exploit due to various control plane hardening measures.

    An attacker with permissions to create a Pod with certain built-in Volume types (GlusterFS, Quobyte, StorageFS, ScaleIO) or permissions to create a StorageClass can cause kube-controller-manager to make GET requests or POST requests without an attacker controlled request body from the master's host network. These volume types are rarely used on GKE, so new use of these volume types may be a useful detection signal.

    Combined with a means to leak the results of the GET/POST back to the attacker, such as through logs, this can lead to disclosure of sensitive information. We have updated the storage drivers in question to remove the potential for such leaks.

    Medium

    GKE clusters on

    Description Severity

    Server Side Request Forgery (SSRF) vulnerability, CVE-2020-8555, was recently discovered in Kubernetes, allowing certain authorized users to leak up to 500 bytes of sensitive information from the control plane host network. The Google Kubernetes Engine (GKE) control plane uses controllers from Kubernetes and is thus affected by this vulnerability. We recommend that you upgrade the control plane to the latest patch version, as we detail below. A node upgrade is not required.

    What should I do?

    GKE on AWS v0.2.0 or newer already includes the patch for this vulnerability. If you are using a previous version, download a new version of the anthos-gke command line tool and recreate your management and user clusters.

    What vulnerability is addressed by this patch?

    These patches mitigate vulnerability CVE-2020-8555. This is rated as a Medium vulnerability for GKE as it was difficult to exploit due to various control plane hardening measures.

    An attacker with permissions to create a Pod with certain built-in Volume types (GlusterFS, Quobyte, StorageFS, ScaleIO) or permissions to create a StorageClass can cause kube-controller-manager to make GET requests or POST requests without an attacker controlled request body from the master's host network. These volume types are rarely used on GKE, so new use of these volume types may be a useful detection signal.

    Combined with a means to leak the results of the GET/POST back to the attacker, such as through logs, this can lead to disclosure of sensitive information. We have updated the storage drivers in question to remove the potential for such leaks.

    Medium

    GCP-2020-006

    Published: 2020-06-01
    Reference: Kubernetes issue 91507

    GKE

    Description Severity

    Kubernetes has disclosed a vulnerability that allows a privileged container to redirect node traffic to another container. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack. All Google Kubernetes Engine (GKE) nodes are affected by this vulnerability, and we recommend that you upgrade to the latest patch version, as we detail below.

    What should I do?

    To mitigate this vulnerability, upgrade your control plane, and then your nodes to one of the patched versions listed below. Clusters on release channels are already running a patched version on both control plane and nodes:
    • 1.14.10-gke.36
    • 1.15.11-gke.15
    • 1.16.8-gke.15

    Very few containers typically require CAP_NET_RAW. This and other powerful capabilities should be blocked by default through PodSecurityPolicy or Anthos Policy Controller:

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigate the following vulnerability:

    The vulnerability described in Kubernetes issue 91507 CAP_NET_RAW capability (which is included in the default container capability set) to maliciously configure the IPv6 stack on the node and redirect node traffic to the attacker controlled container. This will allow the attacker to intercept/modify traffic originating from or destined for the node. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack.

    Medium

    GKE clusters on

    Description Severity

    Kubernetes has disclosed a vulnerability that allows a privileged container to redirect node traffic to another container. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack. All Google Kubernetes Engine (GKE) nodes are affected by this vulnerability, and we recommend that you upgrade to the latest patch version, as we detail below.

    What should I do?

    To mitigate this vulnerability for GKE on VMware, upgrade your clusters to the following version or newer:
    • Anthos 1.3.2

    Very few containers typically require CAP_NET_RAW. This and other powerful capabilities should be blocked by default through Anthos Policy Controller or by updating your Pod specs:

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigate the following vulnerability:

    The vulnerability described in Kubernetes issue 91507 CAP_NET_RAW capability (which is included in the default container capability set) to maliciously configure the IPv6 stack on the node and redirect node traffic to the attacker controlled container. This will allow the attacker to intercept/modify traffic originating from or destined for the node. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack.

    Medium

    GKE clusters on

    Description Severity

    Kubernetes has disclosed a vulnerability that allows a privileged container to redirect node traffic to another container. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack. All Google Kubernetes Engine (GKE) nodes are affected by this vulnerability, and we recommend that you upgrade to the latest patch version, as we detail below.

    What should I do?

    Download the anthos-gke command line tool with the following version or newer and recreate your management and user clusters:

    • aws-0.2.1-gke.7

    Very few containers typically require CAP_NET_RAW. This and other powerful capabilities should be blocked by default through Anthos Policy Controller or by updating your Pod specs:

    Drop the CAP_NET_RAW capability from containers with one of the following methods:

    • Enforce blocking these capabilities with PodSecurityPolicy, for example:
          # Require dropping CAP_NET_RAW with a PSP
          apiversion: extensions/v1beta1
          kind: PodSecurityPolicy
          metadata:
            name: no-cap-net-raw
          spec:
            requiredDropCapabilities:
              -NET_RAW
               ...
               # Unrelated fields omitted
    • Or by using Policy Controller or Gatekeeper with this constraint template and applying it, for example:
          # Dropping CAP_NET_RAW with Gatekeeper
          # (requires the K8sPSPCapabilities template)
          apiversion: constraints.gatekeeper.sh/v1beta1
          kind:  K8sPSPCapabilities
          metadata:
            name: forbid-cap-net-raw
          spec:
            match:
              kinds:
                - apiGroups: [""]
                kinds: ["Pod"]
              namespaces:
                #List of namespaces to enforce this constraint on
                - default
              # If running gatekeeper >= v3.1.0-beta.5,
              # you can exclude namespaces rather than including them above.
              excludedNamespaces:
                - kube-system
            parameters:
              requiredDropCapabilities:
                - "NET_RAW"
    • Or by updating your Pod specs:
          # Dropping CAP_NET_RAW from a Pod:
          apiVersion: v1
          kind: Pod
          metadata:
            name: no-cap-net-raw
          spec:
            containers:
              -name: my-container
               ...
              securityContext:
                capabilities:
                  drop:
                    -NET_RAW

    What vulnerability is addressed by this patch?

    The patch mitigate the following vulnerability:

    The vulnerability described in Kubernetes issue 91507 CAP_NET_RAW capability (which is included in the default container capability set) to maliciously configure the IPv6 stack on the node and redirect node traffic to the attacker controlled container. This will allow the attacker to intercept/modify traffic originating from or destined for the node. Mutual TLS/SSH traffic, such as between the kubelet and API server or traffic from applications using mTLS cannot be read or modified by this attack.

    Medium

    GCP-2020-005

    Published: 2020-05-07
    Updated: 2020-05-07
    Reference: CVE-2020-8835

    GKE

    Description Severity

    A vulnerability was recently discovered in the Linux kernel, described in CVE-2020-8835, allowing container escape to obtain root privileges on the host node.

    Google Kubernetes Engine (GKE) Ubuntu nodes running GKE 1.16 or 1.17 are affected by this vulnerability, and we recommend that you upgrade to the latest patch version as soon as possible, as we detail below.

    Nodes running Container-Optimized OS are not affected. Nodes running on GKE on VMware are not affected.

    What should I do?

    For most customers, no further action is required. Only nodes running Ubuntu in GKE version 1.16 or 1.17 are affected.

    In order to upgrade your nodes, you must first upgrade your master to the newest version. This patch will be available in Kubernetes 1.16.8-gke.12, 1.17.4-gke.10, and newer releases. Track the availability of these patches in the release notes.

    What vulnerability is addressed by this patch?

    The patch mitigates the following vulnerability:

    CVE-2020-8835 describes a vulnerability in the Linux kernel version 5.5.0 and newer that allows a malicious container to (with minimal user interaction in the form of an exec) read and write kernel memory and thus gain root-level code execution on the host node. This is rated as a 'High' severity vulnerability.

    High

    GCP-2020-004

    Published: 2020-05-07
    Updated: 2020-05-07
    Reference: CVE-2019-11254

    GKE clusters on

    Description Severity

    A vulnerability was recently discovered in Kubernetes, described in CVE-2019-11254, which allows any user authorized to make POST requests to execute a remote Denial-of-Service attack on a Kubernetes API server. The Kubernetes Product Security Committee (PSC) released additional information on this vulnerability which can be found here.

    You can mitigate this vulnerability by limiting which clients have network access to your Kubernetes API servers.

    What should I do?

    We recommend that you upgrade your clusters to patch versions containing the fix for this vulnerability as soon as they are available.

    The patch versions which contain the fix are listed below:

    • Anthos 1.3.0, which runs Kubernetes version 1.15.7-gke.32

    What vulnerabilities are addressed by this patch?

    The patch fixes the following Denial-of-Service (DoS) vulnerability:

    CVE-2019-11254.

    Medium

    GCP-2020-003

    Published: 2020-03-31
    Updated: 2020-03-31
    Reference: CVE-2019-11254

    GKE

    Description Severity

    A vulnerability was recently discovered in Kubernetes, described in CVE-2019-11254, which allows any user authorized to make POST requests to execute a remote Denial-of-Service attack on a Kubernetes API server. The Kubernetes Product Security Committee (PSC) released additional information on this vulnerability which can be found here.

    GKE Clusters that use Master Authorized Networks and Private clusters with no public endpoint mitigate this vulnerability.

    What should I do?

    We recommend that you upgrade your cluster to a patch version containing the fix for this vulnerability.

    The patch versions which contain the fix are listed below:

    • 1.13.12-gke.29
    • 1.14.9-gke.27
    • 1.14.10-gke.24
    • 1.15.9-gke.20
    • 1.16.6-gke.1

    What vulnerabilities are addressed by this patch?

    The patch fixes the following Denial-of-Service (DoS) vulnerability:

    CVE-2019-11254.

    Medium

    GCP-2020-002

    Published: 2020-03-23
    Updated: 2020-03-23
    Reference: CVE-2020-8551, CVE-2020-8552

    GKE

    Description Severity

    Kubernetes has disclosed two denial of service vulnerabilities, one impacting the API server, and the other impacting Kubelets. For more details, see the Kubernetes issues: 89377 and 89378.

    What should I do?

    All GKE users are protected from CVE-2020-8551 unless untrusted users can send requests within the cluster's internal network. Use of master authorized networks additionally mitigates against CVE-2020-8552.

    When will these be patched?

    Patches for CVE-2020-8551 require a node upgrade. The patch versions which will contain the mitigation are listed below:

    • 1.15.10-gke.*
    • 1.16.7-gke.*

    Patches for CVE-2020-8552 require a master upgrade. The patch versions which will contain the mitigation are listed below:

    • 1.14.10-gke.32
    • 1.15.10-gke.*
    • 1.16.7-gke.*
    Medium

    GCP-january_21_2020

    Published: 2020-01-21
    Updated: 2020-01-24
    Reference: CVE-2019-11254

    GKE

    Description Severity

    2020-01-24 Update: The process of making patched versions available is already underway and will be completed by January 25, 2020.


    Microsoft has disclosed a vulnerability in the Windows Crypto API and its validation of elliptic curve signatures. For more information please see Microsoft's disclosure.

    What should I do?

    For most customers, no further action is required. Only nodes running Windows Server are impacted.

    For customers who are using Windows Server nodes, both the nodes and the containerized workloads that run on those nodes must be updated to patched versions to mitigate this vulnerability.

    To update the containers:

    Rebuild your containers using Microsoft's latest base container images, selecting a servercore or nanoserver tag with a LastUpdated Time of 1/14/2020 or later.

    To update the nodes:

    The process of making patched versions available is already underway and will be completed by January 24, 2020.

    You may either wait until that time and perform a node upgrade to a patched GKE version or you may use Windows Update to deploy the latest Windows patch manually at any time.

    The patch versions which will contain the mitigation are listed below:

    • 1.14.7-gke.40
    • 1.14.8-gke.33
    • 1.14.9-gke.23
    • 1.14.10-gke.17
    • 1.15.7-gke.23
    • 1.16.4-gke.22

    What vulnerabilities are addressed by this patch?

    The patch mitigates the following vulnerabilities:

    CVE-2020-0601 - This vulnerability is also known as the Windows Crypto API Spoofing Vulnerability and could be exploited to make malicious executables appear trusted or allow the attacker to conduct man-in-the-middle attacks and decrypt confidential information on TLS connections to the affected software.

    NVD Base Score: 8.1 (High)

    Archived security bulletins

    For security bulletins prior to 2020, see the Security bulletins archive.