| Package | Affected versions | Patched versions |
|---|---|---|
| github.com/containerd/containerd | ≥ 1.6.0, < 1.6.18< 1.5.18 | 1.6.181.5.18 |
| containerd | ≥ 1.6.0, < 1.6.18< 1.5.18 | 1.6.181.5.18 |
A bug was found in containerd where supplementary groups are not set up properly inside a container. If an attacker has direct access to a container and manipulates their supplementary group access, they may be able to use supplementary group access to bypass primary group restrictions in some cases, potentially gaining access to sensitive information or gaining the ability to execute code in that container.
Downstream applications that use the containerd client library may be affected as well.
This bug has been fixed in containerd v1.6.18 and v.1.5.18. Users should update to these versions and recreate containers to resolve this issue. Users who rely on a downstream application that uses containerd's client library should check that application for a separate advisory and instructions.
Ensure that the "USER $USERNAME" Dockerfile instruction is not used. Instead, set the container entrypoint to a value similar to ENTRYPOINT ["su", "-", "user"] to allow su to properly set up supplementary groups.
Note that CVE IDs apply to a particular implementation, even if an issue is common.
If you have any questions or comments about this advisory:
To report a security issue in containerd:
Running one of these products? Scan your site to see whether it exposes a vulnerable version.
Scan my site free