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Improper Preservation of Permissions Affecting docker package, versions <20.10.9-r0

0.0
medium

Snyk CVSS

    Attack Complexity Low
    Scope Changed

    Threat Intelligence

    EPSS 0.05% (17th percentile)
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NVD
6.3 medium
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SUSE
6.3 medium
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Red Hat
6.3 medium

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  • Snyk ID SNYK-ALPINE316-DOCKER-2842822
  • published 5 Oct 2021
  • disclosed 4 Oct 2021
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Introduced: 4 Oct 2021

CVE-2021-41091 Open this link in a new tab
CWE-281 Open this link in a new tab

How to fix?

Upgrade Alpine:3.16 docker to version 20.10.9-r0 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream docker package and not the docker package as distributed by Alpine. See How to fix? for Alpine:3.16 relevant fixed versions and status.

Moby is an open-source project created by Docker to enable software containerization. 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. 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. For users unable to upgrade limit access to the host to trusted users. Limit access to host volumes to trusted containers.