==========================================================================
Ubuntu Security Notice USN-6088-1
May 18, 2023

runc vulnerabilities
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Several security issues were fixed in runC.

Software Description:
- runc: Open Container Project

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:

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

Ubuntu 23.04:
   runc                            1.1.4-0ubuntu3.1

Ubuntu 22.10:
   runc                            1.1.4-0ubuntu1~22.10.3

Ubuntu 22.04 LTS:
   runc                            1.1.4-0ubuntu1~22.04.3

Ubuntu 20.04 LTS:
   runc                            1.1.4-0ubuntu1~20.04.3

Ubuntu 18.04 LTS:
   runc                            1.1.4-0ubuntu1~18.04.2

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

References:
   https://ubuntu.com/security/notices/USN-6088-1
   CVE-2023-25809, CVE-2023-27561, CVE-2023-28642

Package Information:
   https://launchpad.net/ubuntu/+source/runc/1.1.4-0ubuntu3.1
   https://launchpad.net/ubuntu/+source/runc/1.1.4-0ubuntu1~22.10.3
   https://launchpad.net/ubuntu/+source/runc/1.1.4-0ubuntu1~22.04.3
   https://launchpad.net/ubuntu/+source/runc/1.1.4-0ubuntu1~20.04.3
   https://launchpad.net/ubuntu/+source/runc/1.1.4-0ubuntu1~18.04.2