Bug 1148777 (CVE-2014-7283)

Summary:	CVE-2014-7283 kernel: xfs: directory hash ordering denial of service
Product:	[Other] Security Response	Reporter:	Martin Prpič <mprpic>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	agordeev, aquini, bhu, davej, dhoward, esammons, fhrbata, gansalmon, iboverma, itamar, jforbes, jkacur, jonathan, jross, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, matt, mchehab, mcressma, nmurray, pholasek, plougher, pmatouse, ppandit, rt-maint, rvrbovsk, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:	A denial of service flaw was found in the way the Linux kernel's XFS file system implementation ordered directory hashes under certain conditions. A local attacker could use this flaw to corrupt the file system by creating directories with colliding hash values, potentially resulting in a system crash.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-12-02 17:10:47 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1148779
Bug Blocks:	1148778

Description Martin Prpič 2014-10-02 10:31:17 UTC

A flaw was found in the way the xfs_da3_fixhashpath() function of the Linux kernel's XFS file system implementation ordered directory hashes under certain conditions. A local attacker could use this flaw to corrupt the file system by creating directories, potentially resulting in kernel panic.

Upstream fix:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c88547a8119e3b581318ab65e9b72f27f23e641d

Reproducer:

http://oss.sgi.com/cgi-bin/gitweb.cgi?p=xfs/cmds/xfstests.git;a=blob;f=src/dirhash_collide.c;h=55cec872d5061ac2ca0f56d1f11e6bf349d5bb97;hb=947ee8bd4b59770534297572b14c695e9c6e001e

References:

http://seclists.org/oss-sec/2014/q4/28
http://marc.info/?l=linux-xfs&m=139590613002926&w=2

Comment 2 Petr Matousek 2014-10-02 10:54:52 UTC

Statement:

This issue does not affect the Linux kernel packages as shipped with Red Hat Enterprise Linux 5, 6 and 7.

Comment 4 errata-xmlrpc 2014-12-02 17:09:21 UTC

This issue has been addressed in the following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:1943 https://rhn.redhat.com/errata/RHSA-2014-1943.html