CVE-2022-36109: Moby vulnerability relating to supplementary group permissions
First published: Fri Sep 09 2022(Updated: )
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. Users should update to this version when it is available. 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. Thanks to Steven Murdoch for reporting this issue. ---- ### Impact 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. ### Patches This bug is fixed in Moby (Docker Engine) 20.10.18. Users should update to this version when it is available. ### Workarounds 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. ### References https://www.benthamsgaze.org/2022/08/22/vulnerability-in-linux-containers-investigation-and-mitigation/ ### For more information If you have any questions or comments about this advisory: * [Open an issue](https://github.com/moby/moby/issues/new) * Email us at [security@docker.com](mailto:security@docker.com)
Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mobyproject Moby | <20.10.18 | |
| Fedoraproject Fedora | =36 | |
| Fedoraproject Fedora | =37 | |
| go/github.com/docker/docker | <20.10.18 | 20.10.18 |
| <20.10.18 | ||
| =36 | ||
| =37 |
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Reference Links
- https://github.com/moby/moby/commit/de7af816e76a7fd3fbf06bffa6832959289fba32
- https://github.com/moby/moby/releases/tag/v20.10.18
- https://github.com/moby/moby/security/advisories/GHSA-rc4r-wh2q-q6c4
- 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://nvd.nist.gov/vuln/detail/CVE-2022-36109
- 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://github.com/advisories/GHSA-rc4r-wh2q-q6c4 (Advisory)
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/O7JL2QA3RB732MLJ3RMUXB3IB7AA22YU/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/RQQ4E3JBXVR3VK5FIZVJ3QS2TAOOXXTQ/
Frequently Asked Questions
What is CVE-2022-36109?
CVE-2022-36109 is a vulnerability found in Moby (Docker Engine) where supplementary groups are not set up properly, allowing an attacker with direct access to a container to manipulate their supplementary group access.
How does CVE-2022-36109 affect Moby and Fedora?
CVE-2022-36109 affects Moby versions up to (but not including) 20.10.18 and Fedora versions 36 and 37.
What is the severity of CVE-2022-36109?
The severity of CVE-2022-36109 is medium with a CVSS score of 6.3.
How can an attacker exploit CVE-2022-36109?
An attacker with direct access to a container can exploit CVE-2022-36109 by manipulating their supplementary group access.
How can I fix CVE-2022-36109?
To fix CVE-2022-36109, update to Moby version 20.10.18 or later.
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