Archive package allows chmod of file outside of unpack target directory
Moderate severity
GitHub Reviewed
Published
Jul 19, 2021
in
containerd/containerd
•
Updated Jan 31, 2024
Package
Affected versions
< 1.4.8
>= 1.5.0, < 1.5.4
Patched versions
1.4.8
1.5.4
Description
Published by the National Vulnerability Database
Jul 19, 2021
Reviewed
Jul 22, 2021
Published to the GitHub Advisory Database
Jul 26, 2021
Last updated
Jan 31, 2024
Credits
-
tdunlap607 Analyst
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:
References