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: 1871730
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:
Doc Type: If docs needed, set a value
Doc Text:
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
Embargoed:

Attachments (Terms of Use)

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.
Note You need to log in before you can comment on or make changes to this bug.