medium
6.3
CWE
281 732
Advisory Published
CVE Published
Advisory Published
Updated

CVE-2021-41091: Insufficiently restricted permissions on data directory in Docker Engine

First published: Mon Oct 04 2021(Updated: )

## 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](https://github.com/moby/moby/blob/master/SECURITY.md). ## For more information If you have any questions or comments about this advisory: * [Open an issue](https://github.com/moby/moby/issues/new) * Email us at security@docker.com if you think you’ve found a security bug

Credit: security-advisories@github.com security-advisories@github.com

Affected SoftwareAffected VersionHow to fix
Mobyproject Moby<20.10.9
Fedoraproject Fedora=34
Fedoraproject Fedora=35
redhat/moby<20.10.9
20.10.9
go/github.com/moby/moby<20.10.9
20.10.9
go/github.com/docker/docker<20.10.9
20.10.9

Remedy

https://github.com/moby/moby/commit/f0ab919f518c47240ea0e72d0999576bb8008e64

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Reference Links

Frequently Asked Questions

  • What is CVE-2021-41091?

    CVE-2021-41091 is a file permissions vulnerability found in the Moby (Docker Engine) software.

  • How does CVE-2021-41091 affect users?

    CVE-2021-41091 allows unprivileged Linux users to traverse Moby's data directory and potentially access sensitive information.

  • What is the severity of CVE-2021-41091?

    CVE-2021-41091 has a severity rating of 6.3 (Medium).

  • Which software versions are affected by CVE-2021-41091?

    Versions up to and excluding 20.10.9 of Moby (Docker Engine) are affected by CVE-2021-41091.

  • How can I fix CVE-2021-41091?

    To fix CVE-2021-41091, update Moby (Docker Engine) to version 20.10.9 or later.

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