medium
6.3
CWE
863
Advisory Published
Advisory Published
Updated

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. 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.

Credit: security-advisories@github.com security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
go/github.com/docker/docker<20.10.18
20.10.18
Moby<20.10.18
Red Hat Fedora=36
Red Hat Fedora=37

Remedy

https://github.com/moby/moby/commit/de7af816e76a7fd3fbf06bffa6832959289fba32

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Reference Links

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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