Bug 2023448 (CVE-2021-41091) - CVE-2021-41091 moby: data directory contains subdirectories with insufficiently restricted permissions, which could lead to directory traversal
Summary: CVE-2021-41091 moby: data directory contains subdirectories with insufficient...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-41091
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2010238 2010241 2023965 2023966 2023967 2023968 2023969 2024828 2024830 2026050 2026051 2026052 2026053 2026054 2026055 2026056 2026057
Blocks: 2023450
TreeView+ depends on / blocked
 
Reported: 2021-11-15 18:06 UTC by Michael Kaplan
Modified: 2022-03-03 19:32 UTC (History)
35 users (show)

Fixed In Version: moby 20.10.9
Clone Of:
Environment:
Last Closed: 2022-03-03 19:32:54 UTC
Embargoed:

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System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2022:0735 0 None None None 2022-03-03 06:58:06 UTC

Description Michael Kaplan 2021-11-15 18:06:12 UTC 
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. 

References: 

https://github.com/moby/moby/commit/f0ab919f518c47240ea0e72d0999576bb8008e64
https://github.com/moby/moby/security/advisories/GHSA-3fwx-pjgw-3558
Comment 8 errata-xmlrpc 2022-03-03 06:58:03 UTC 
This issue has been addressed in the following products:

  Red Hat Advanced Cluster Management for Kubernetes 2.4 for RHEL 8

Via RHSA-2022:0735 https://access.redhat.com/errata/RHSA-2022:0735
Comment 9 Product Security DevOps Team 2022-03-03 19:32:51 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-41091
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