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Security Advisories: MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWM3MnAtOXhtai1yeDN3

Archive package allows chmod of file outside of unpack target directory

Impact

A bug was found in containerd where pulling and extracting a specially-crafted container image can result in Unix file permission changes for existing files in the host’s filesystem. Changes to file permissions can deny access to the expected owner of the file, widen access to others, or set extended bits like setuid, setgid, and sticky. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process.

Patches

This bug has been fixed in containerd 1.5.4 and 1.4.8. Users should update to these versions as soon as they are released. Running containers do not need to be restarted.

Workarounds

Ensure you only pull images from trusted sources.

Linux security modules (LSMs) like SELinux and AppArmor can limit the files potentially affected by this bug through policies and profiles that prevent containerd from interacting with unexpected files.

For more information

If you have any questions or comments about this advisory:

Permalink: https://github.com/advisories/GHSA-c72p-9xmj-rx3w
JSON: https://advisories.ecosyste.ms/api/v1/advisories/MDE2OlNlY3VyaXR5QWR2aXNvcnlHSFNBLWM3MnAtOXhtai1yeDN3
Source: GitHub Advisory Database
Origin: Unspecified
Severity: Moderate
Classification: General
Published: almost 2 years ago
Updated: 2 months ago


CVSS Score: 5.0
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L

Identifiers: GHSA-c72p-9xmj-rx3w, CVE-2021-32760
References:

Affected Packages

go:github.com/containerd/containerd
Versions: >= 1.5.0, < 1.5.4, < 1.4.8
Fixed in: 1.5.4, 1.4.8