CVE-2021-41091

 

Published at: - 04-10-2021 11:15

Last modified: - 14-06-2022 01:15

Total changes: - 7

Description

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where the data directory (typically `/var/lib/docker`) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as `setuid`), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers should be stopped and restarted for the permissions to be fixed. For users unable to upgrade limit access to the host to trusted users. Limit access to host volumes to trusted containers.

Common Vulnerability Scoring System (CVSS)

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

 

Verification logic

 

Reference

• https://github.com/moby/moby/commit/f0ab919f518c47240ea0e72d0999576bb8008e64
• https://github.com/moby/moby/security/advisories/GHSA-3fwx-pjgw-3558
• FEDORA-2021-df975338d4-Mailing List, Third Party Advisory
• FEDORA-2021-b5a9a481a2-Mailing List, Third Party Advisory
• https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf

 

Keywords

NVD

 

CVE-2021-41091

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures