Bug 1871727 (CVE-2016-2854) - CVE-2016-2854 kernel: aufs module does not properly maintain POSIX ACL xattr data
Summary: CVE-2016-2854 kernel: aufs module does not properly maintain POSIX ACL xattr ...
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-2854
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: 1871728
Blocks: Embargoed1871730
TreeView+ depends on / blocked
 
Reported: 2020-08-24 07:06 UTC by Dhananjay Arunesh
Modified: 2020-08-28 15:24 UTC (History)
47 users (show)

Fixed In Version:
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A flaw was found in the Linux kernel. The aufs module does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.
Clone Of:
Environment:
Last Closed: 2020-08-28 15:24:43 UTC

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Description Dhananjay Arunesh 2020-08-24 07:06:08 UTC 
The aufs module for the Linux kernel does not properly maintain POSIX ACL xattr data, which allows local users to gain privileges by leveraging a group-writable setgid directory.

References:
http://www.halfdog.net/Security/2016/AufsPrivilegeEscalationInUserNamespaces/
http://www.openwall.com/lists/oss-security/2016/02/24/9
Comment 1 Dhananjay Arunesh 2020-08-24 07:07:09 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1871728]
Comment 2 Justin M. Forbes 2020-08-24 12:57:00 UTC 
Aufs was never a part of the linux kernel. Overlayfs was the preferred solution that was brought in upstream.
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