Bug 1064253 (CVE-2014-0069)

Summary:	CVE-2014-0069 kernel: cifs: incorrect handling of bogus user pointers during uncached writes
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
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, anton, aquini, bhu, dhoward, esammons, fhrbata, gbarros, iboverma, jkacur, jkurik, jlayton, jross, kernel-mgr, lgoncalv, lwang, matt, mcressma, npajkovs, pholasek, security-response-team, sprabhu, williams
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2014-04-28 17:38:47 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Bug Depends On:	1062578, 1062584, 1062585, 1062588, 1062590, 1065668, 1065669, 1065670
Bug Blocks:	1064259

Description Petr Matousek 2014-02-12 10:02:40 UTC

A flaw was found in the way cifs handled iovecs with bogus pointers
userland passed down via writev() during uncached writes.

An unprivileged local user with access to cifs share could use this flaw
to crash the system or leak kernel memory. Privilege escalation cannot be
ruled out (since memory corruption is involved), but is unlikely.

The default cache settings for cifs mounts on Red Hat Enterprise Linux
prohibit successful exploitation of this issue.

Acknowledgements:

Red Hat would like to thank Al Viro for reporting this issue.

Comment 3 Vincent Danen 2014-02-14 17:05:59 UTC

Patches have been reported to the linux-cifs mailing list:

http://article.gmane.org/gmane.linux.kernel.cifs/9401
http://article.gmane.org/gmane.linux.kernel.cifs/9402

The CVE has not been mentioned in the patches, however.  Only the first patch is required to fix the flaw.  The second patch is to ensure that this does not get hit again in the future by adding extra protection.

Comment 6 Fedora Update System 2014-02-17 21:02:19 UTC

kernel-3.12.11-201.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2014-02-17 21:05:45 UTC

kernel-3.13.3-201.fc20 has been pushed to the Fedora 20 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 Petr Matousek 2014-03-05 06:45:00 UTC

Statement:

This issue did not affect the versions of Linux kernel as shipped with Red Hat Enterprise Linux 5.

Comment 9 errata-xmlrpc 2014-04-01 08:23:42 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2014:0328 https://rhn.redhat.com/errata/RHSA-2014-0328.html

Comment 10 errata-xmlrpc 2014-04-28 16:55:57 UTC

This issue has been addressed in following products:

  MRG for RHEL-6 v.2

Via RHSA-2014:0439 https://rhn.redhat.com/errata/RHSA-2014-0439.html