Improper Preservation of Permissions Affecting containerd package, versions <1.4.11-56.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.05% (20th percentile)

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  • Snyk IDSNYK-SLES150-CONTAINERD-2661198
  • published14 Apr 2022
  • disclosed25 Oct 2021

Introduced: 25 Oct 2021

CVE-2021-41091  (opens in a new tab)
CWE-281  (opens in a new tab)

How to fix?

Upgrade SLES:15.0 containerd to version 1.4.11-56.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream containerd package and not the containerd package as distributed by SLES. See How to fix? for SLES:15.0 relevant fixed versions and status.

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.

CVSS Scores

version 3.1