Moby vulnerability relating to supplementary group permissions
At a glance
Severity
MEDIUM 5.3
EPSS
EPSS 1.04 % · percentile 64 (2026-10-27)
State
PUBLISHED
Published
Updated
Assigner
GitHub_M
NVD status
Modified
Description
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.
GHSA-rc4r-wh2q-q6c4 — Docker supplementary group permissions not set up properly, allowing attackers to bypass primary group restrictions
GO-2022-0985 — Docker supplementary group permissions not set up properly, allowing attackers to bypass primary group restrictions in github.com/docker/docker
