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GHSA-3fwx-pjgw-3558: Moby (Docker Engine) Insufficiently restricted permissions on data directory

Impact

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.

Patches

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.

Workarounds

Limit access to the host to trusted users. Limit access to host volumes to trusted containers.

Credits

The Moby project would like to thank Joan Bruguera for responsibly disclosing this issue in accordance with the Moby security policy.

For more information

If you have any questions or comments about this advisory:

ghsa
#vulnerability#linux#git#pdf#docker

Package

gomod github.com/moby/moby (Go)

Affected versions

< 20.10.9

Patched versions

20.10.9

Description

Impact

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.

Patches

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.

Workarounds

Limit access to the host to trusted users. Limit access to host volumes to trusted containers.

Credits

The Moby project would like to thank Joan Bruguera for responsibly disclosing this issue in accordance with the Moby security policy.

For more information

If you have any questions or comments about this advisory:

References

  • GHSA-3fwx-pjgw-3558
  • https://nvd.nist.gov/vuln/detail/CVE-2021-41091
  • moby/moby@f0ab919
  • https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf
  • https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/
  • https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/

thaJeztah published to moby/moby

Oct 4, 2021

Published by the National Vulnerability Database

Oct 4, 2021

Published to the GitHub Advisory Database

Jan 31, 2024

Reviewed

Jan 31, 2024

Last updated

Jan 31, 2024

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