Your submission was sent successfully! Close

You have successfully unsubscribed! Close

Thank you for signing up for our newsletter!
In these regular emails you will find the latest updates about Ubuntu and upcoming events where you can meet our team.Close

CVE-2023-25173

Published: 16 February 2023

containerd is an open source container runtime. A bug was found in containerd prior to versions 1.6.18 and 1.5.18 where supplementary groups are not set up properly inside a container. If an attacker has direct access to a container and manipulates their supplementary group access, they may be able to use supplementary group access to bypass primary group restrictions in some cases, potentially gaining access to sensitive information or gaining the ability to execute code in that container. Downstream applications that use the containerd client library may be affected as well. This bug has been fixed in containerd v1.6.18 and v.1.5.18. Users should update to these versions and recreate containers to resolve this issue. Users who rely on a downstream application that uses containerd's client library should check that application for a separate advisory and instructions. As a workaround, ensure that the `"USER $USERNAME"` Dockerfile instruction is not used. Instead, set the container entrypoint to a value similar to `ENTRYPOINT ["su", "-", "user"]` to allow `su` to properly set up supplementary groups.

Priority

Medium

Cvss 3 Severity Score

7.8

Score breakdown

Status

Package Release Status
containerd
Launchpad, Ubuntu, Debian
bionic
Released (1.6.12-0ubuntu1~18.04.1+esm1)
Available with Ubuntu Pro
focal
Released (1.6.12-0ubuntu1~20.04.3)
jammy
Released (1.6.12-0ubuntu1~22.04.3)
kinetic
Released (1.6.12-0ubuntu1~22.10.2)
trusty Ignored
(end of standard support)
upstream
Released (1.6.18+ds1-1)
xenial
Released (1.2.6-0ubuntu1~16.04.6+esm4)
Available with Ubuntu Pro
lunar
Released (1.6.12-0ubuntu3.1)

Severity score breakdown

Parameter Value
Base score 7.8
Attack vector Local
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H