Bug 998401 - (CVE-2013-4247) CVE-2013-4247 kernel: cifs: off-by-one bug in build_unc_path_to_root
CVE-2013-4247 kernel: cifs: off-by-one bug in build_unc_path_to_root
Product: Security Response
Classification: Other
Component: vulnerability (Show other bugs)
All Linux
medium Severity medium
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Assigned To: Red Hat Product Security
: Security
Depends On:
Blocks: 979015
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Reported: 2013-08-19 04:34 EDT by Prasad J Pandit
Modified: 2016-03-04 05:48 EST (History)
28 users (show)

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Doc Type: Bug Fix
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Last Closed: 2014-06-10 01:18:02 EDT
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Description Prasad J Pandit 2013-08-19 04:34:33 EDT
Linux kernel built with the Common Internet File System (CONFIG_CIFS) support along with a feature to access Distributed File Systems (CONFIG_CIFS_DFS_UPCALL), is vulnerable to a memory corruption flaw caused by writing one byte past an allocated memory area. It occurs while mounting a DFS share wherein the server provides DFS referral names of certain length. The memory corruption leads to an unresponsive kernel and subsequent crash resulting in Denial of Service.

An user/program able to mount a file system could use this flaw to crash the kernel resulting in DoS.

Upstream fix:
 -> https://git.kernel.org/linus/1fc29bacedeabb278080e31bb9c1ecb49f143c3b

 -> http://www.openwall.com/lists/oss-security/2013/08/14/8
Comment 1 Prasad J Pandit 2013-08-19 04:37:48 EDT

This issue does not affect the versions of the kernel package as shipped with Red Hat Enterprise Linux 5, 6 and Red Hat Enterprise MRG 2.

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