Bug 1871722 (CVE-2016-2853) - CVE-2016-2853 kernel: aufs module does not properly restrict the mount namespace
Summary: CVE-2016-2853 kernel: aufs module does not properly restrict the mount namespace
Keywords:
Status: CLOSED NOTABUG
Alias: CVE-2016-2853
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1871723
Blocks: 1871725
TreeView+ depends on / blocked
 
Reported: 2020-08-24 07:00 UTC by Dhananjay Arunesh
Modified: 2020-09-01 14:09 UTC (History)
47 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2020-08-28 15:26:37 UTC
Embargoed:

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Description Dhananjay Arunesh 2020-08-24 07:00:06 UTC 
The aufs module for the Linux kernel does not properly restrict the mount namespace, which allows local users to gain privileges by mounting an aufs filesystem on top of a FUSE filesystem, and then executing a crafted setuid program.

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 07:02:12 UTC 
Created kernel tracking bugs for this issue:

Affects: fedora-all [bug 1871723]
Comment 2 Justin M. Forbes 2020-08-24 12:55:09 UTC 
Aufs is not an upstream kernel module, it was never merged as overlayfs was preferred.
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