CVE-2021-41103Medium· 5.9▾ SunlitInsufficiently restricted permissions on plugin directories
▾ Sunlit zone — Low / medium · no exploitation signal
impact 32.5 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 9.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.5%
0.5% → 0.5%
A bug was found in containerd where container root directories and some plugins had 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 vulnerability has been fixed in containerd 1.4.11 and containerd 1.5.7. Users should update to these version when they are released and may restart containers or update directory permissions to mitigate the vulnerability.
Limit access to the host to trusted users. Update directory permission on container bundles directories.
If you have any questions or comments about this advisory:
github.com/containerd/containerd < 1.4.11github.com/containerd/containerd >= 1.5.0, < 1.5.7Upgrade to a patched release:
github.com/containerd/containerd 1.4.11github.com/containerd/containerd 1.5.7Connected by shared product, vendor, weakness, or advisory.
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