Moby up to 20.10.17 Supplementary Group authorization

Summaryinfo

A vulnerability was found in Moby up to 20.10.17. It has been rated as problematic. The impacted element is an unknown function of the component Supplementary Group Handler. Performing a manipulation results in authorization. This vulnerability is known as CVE-2022-36109. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability classified as problematic has been found in Moby up to 20.10.17. This affects an unknown function of the component Supplementary Group Handler. The manipulation with an unknown input leads to a authorization vulnerability. CWE is classifying the issue as CWE-863. The product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. This allows attackers to bypass intended access restrictions. This is going to have an impact on confidentiality. The summary by CVE is:

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.

The weakness was published 09/10/2022 as GHSA-rc4r-wh2q-q6c4. It is possible to read the advisory at github.com. This vulnerability is uniquely identified as CVE-2022-36109 since 07/15/2022. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 266239 (NewStart CGSL MAIN 6.06 : docker-ce Vulnerability (NS-SA-2025-0232)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 20.10.18 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch de7af816e76a7fd3fbf06bffa6832959289fba32 is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (266239). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Name

• Moby

Version

• 20.10.0
• 20.10.1
• 20.10.2
• 20.10.3
• 20.10.4
• 20.10.5
• 20.10.6
• 20.10.7
• 20.10.8
• 20.10.9
• 20.10.10
• 20.10.11
• 20.10.12
• 20.10.13
• 20.10.14
• 20.10.15
• 20.10.16
• 20.10.17

License

• open-source

Website

• Product: https://github.com/moby/moby/

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