Bug 814278 (CVE-2012-2119)

Summary:	CVE-2012-2119 kernel: macvtap: zerocopy: vector length is not validated before pinning user pages
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, anton, arozansk, bhu, davej, dhoward, fhrbata, gansalmon, itamar, jbrouer, jforbes, jkacur, jonathan, jwboyer, kernel-maint, kernel-mgr, lgoncalv, lwang, madhu.chinakonda, plougher, rt-maint, sforsber, 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:	2013-08-24 12:27:43 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:	814286, 814288, 814289
Bug Blocks:	814283

Description Petr Matousek 2012-04-19 14:18:10 UTC

Currently we do not validate the vector length before calling get_user_pages_fast(), host stack could be easily overflowed by malicious guest driver who gives us a descriptors with length greater than MAX_SKB_FRAGS.

A privileged guest user could use this flaw to induce stack overflow on the host with attacker non-controlled data (some bits can be guessed, as it will be pointers to kernel memory) but with attacker controlled length.

References:
http://marc.info/?l=linux-netdev&m=133455718001608&w=2

Comment 2 Petr Matousek 2012-04-19 14:24:17 UTC

Created kernel tracking bugs for this issue

Affects: fedora-all [bug 814289]

Comment 3 Kurt Seifried 2012-04-19 15:09:57 UTC

Added CVE as per http://www.openwall.com/lists/oss-security/2012/04/19/14

Comment 4 Fedora Update System 2012-04-24 04:29:48 UTC

kernel-3.3.2-8.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2012-04-24 14:54:43 UTC

kernel-3.3.2-6.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2012-04-26 03:29:36 UTC

kernel-2.6.43.2-6.fc15 has been pushed to the Fedora 15 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 8 errata-xmlrpc 2012-06-18 13:34:20 UTC

This issue has been addressed in following products:

  Red Hat Enterprise Linux 6

Via RHSA-2012:0743 https://rhn.redhat.com/errata/RHSA-2012-0743.html