linuxfoundation containerd CVE-2021-41103 vulnerability in Linux Foundation and Other Products
Published on October 4, 2021

Insufficiently restricted permissions on plugin directories

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containerd is an open source container runtime with an emphasis on simplicity, robustness and portability. 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. Users unable to update should limit access to the host to trusted users. Update directory permission on container bundles directories.

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Weakness Type

What is a Directory traversal Vulnerability?

The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

CVE-2021-41103 has been classified to as a Directory traversal vulnerability or weakness.


Products Associated with CVE-2021-41103

You can be notified by email with stack.watch whenever vulnerabilities like CVE-2021-41103 are published in these products:

Linux Foundation Containerd
 
Fedora Project Fedora
 
Debian Linux
 

Affected Versions

containerd:

Exploit Probability

EPSS
0.07%
Percentile
20.45%

EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.