CVEvulnerability

CVE-2021-41091

6.3 MEDIUM Published 2021-10-04 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-10-04
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
6.3 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
CVSS 3.1 ([email protected])
6.3 MEDIUM — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L
CVSS 2.0 ([email protected])
4.6 MEDIUM — AV:L/AC:L/Au:N/C:P/I:P/A:P
Weaknesses
CWE-281, CWE-732

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.

Affected configurations

• mobyproject moby (< 20.10.9) • fedoraproject fedora 34 • fedoraproject fedora 35

Related

Weakness · CWE (2)

  • CWE-281 Improper Preservation of Permissions weakness
  • CWE-732 Incorrect Permission Assignment for Critical Resource weakness

References