1. Ubuntu Security Notices
  2. USN-6088-2

USN-6088-2: runC vulnerabilities

Publication date

23 May 2023

Overview

Several security issues were fixed in runC.

Releases

Packages

  • runc - Open Container Project

Details

USN-6088-1 fixed vulnerabilities in runC. This update provides
the corresponding updates for Ubuntu 16.04 LTS.

It was discovered that runC incorrectly performed access control when
mounting /proc to non-directories. An attacker could possibly use
this issue to escalate privileges.
(CVE-2019-19921)

Felix Wilhelm discovered that runC incorrecly handled netlink
messages. An attacker could possibly use
this issue to escalate privileges. (CVE-2021-43784)

Andrew G. Morgan discovered that runC incorrectly set
inherited process capabilities inside the container.
An attacker could possibly use this issue to
escalate privileges. (CVE-2022-29162)

Original advisory details:

It was discovered that runC incorrectly made /sys/fs/cgroup
writable when in rootless mode. An attacker could possibly
use...

USN-6088-1 fixed vulnerabilities in runC. This update provides
the corresponding updates for Ubuntu 16.04 LTS.

It was discovered that runC incorrectly performed access control when
mounting /proc to non-directories. An attacker could possibly use
this issue to escalate privileges.
(CVE-2019-19921)

Felix Wilhelm discovered that runC incorrecly handled netlink
messages. An attacker could possibly use
this issue to escalate privileges. (CVE-2021-43784)

Andrew G. Morgan discovered that runC incorrectly set
inherited process capabilities inside the container.
An attacker could possibly use this issue to
escalate privileges. (CVE-2022-29162)

Original advisory details:

It was discovered that runC incorrectly made /sys/fs/cgroup
writable when in rootless mode. An attacker could possibly
use this issue to escalate privileges. (CVE-2023-25809)

It was discovered that runC incorrectly performed access control when
mounting /proc to non-directories. An attacker could possibly use
this issue to escalate privileges. (CVE-2023-27561)

It was discovered that runC incorrectly handled /proc and
/sys mounts inside a container. An attacker could possibly
use this issue to bypass AppArmor, and potentially SELinux.
(CVE-2023-28642)

Update instructions

In general, a standard system update will make all the necessary changes.

Learn more about how to get the fixes.

The problem can be corrected by updating your system to the following package versions:

Ubuntu Release Package Version
16.04 xenial runc –  1.0.0~rc7+git20190403.029124da-0ubuntu1~16.04.4+esm4  

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References

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