CVE-2022-24769

 

Published at: - 24-03-2022 09:15

Last modified: - 13-06-2022 01:15

Total changes: - 9

Description

Moby is an open-source project created by Docker to enable and accelerate software containerization. A bug was found in Moby (Docker Engine) prior to version 20.10.14 where containers were incorrectly started with non-empty inheritable Linux process capabilities, creating an atypical Linux environment and enabling programs with inheritable file capabilities to elevate those capabilities to the permitted set during `execve(2)`. Normally, when executable programs have specified permitted file capabilities, otherwise unprivileged users and processes can execute those programs and gain the specified file capabilities up to the bounding set. Due to this bug, containers which included executable programs with inheritable file capabilities allowed otherwise unprivileged users and processes to additionally gain these inheritable file capabilities up to the container's bounding set. Containers which use Linux users and groups to perform privilege separation inside the container are most directly impacted. This bug did not affect the container security sandbox as the inheritable set never contained more capabilities than were included in the container's bounding set. This bug has been fixed in Moby (Docker Engine) 20.10.14. Running containers should be stopped, deleted, and recreated for the inheritable capabilities to be reset. This fix changes Moby (Docker Engine) behavior such that containers are started with a more typical Linux environment. As a workaround, the entry point of a container can be modified to use a utility like `capsh(1)` to drop inheritable capabilities prior to the primary process starting.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

 

Verification logic

 

Reference

• https://github.com/moby/moby/commit/2bbc786e4c59761d722d2d1518cd0a32829bc07f
• https://github.com/moby/moby/security/advisories/GHSA-2mm7-x5h6-5pvq
• https://github.com/moby/moby/releases/tag/v20.10.14
• FEDORA-2022-e9a09c1a7d-Mailing List, Third Party Advisory
• FEDORA-2022-ed53f2439a-Mailing List, Third Party Advisory
• FEDORA-2022-c07546070d-Third Party Advisory
• FEDORA-2022-cac2323802-Third Party Advisory
• FEDORA-2022-eda0049dd7-Third Party Advisory
• FEDORA-2022-3826c8f549-Third Party Advisory
• [oss-security] 20220512 CVE-2022-29162: runc < 1.1.2 incorrect handling of inheritable capabilities in default configuration-Mailing List, Third Party Advisory
• DSA-5162-

 

Keywords

NVD

 

CVE-2022-24769

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures