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CVE-2022-36109

Published: 9 September 2022

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where supplementary groups are not set up properly. 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. This bug is fixed in Moby (Docker Engine) 20.10.18. Running containers should be stopped and restarted for the permissions to be fixed. For users unable to upgrade, this problem can be worked around by not using the `"USER $USERNAME"` Dockerfile instruction. Instead by calling `ENTRYPOINT ["su", "-", "user"]` the supplementary groups will be set up properly.

Priority

Medium

Cvss 3 Severity Score

6.3

Score breakdown

Status

Package Release Status
docker.io
Launchpad, Ubuntu, Debian
bionic
Released (20.10.21-0ubuntu1~18.04.1)
focal
Released (20.10.21-0ubuntu1~20.04.1)
jammy
Released (20.10.21-0ubuntu1~22.04.1)
kinetic Ignored
(end of life, was needed)
lunar Not vulnerable
(20.10.21-0ubuntu1)
mantic Not vulnerable
(20.10.21-0ubuntu1)
trusty Ignored
(end of standard support)
upstream
Released (20.10.18)
xenial Needed

Severity score breakdown

Parameter Value
Base score 6.3
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality Low
Integrity impact Low
Availability impact Low
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L