Bug 1012582 (CVE-2013-4371)

Summary:	CVE-2013-4371 xen: use-after-free in libxl_list_cpupool under memory pressure (XSA-70)
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	drjones, imammedo, mrezanin, pbonzini, pmatouse, security-response-team
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:	2013-09-26 16:39:09 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:	1017843
Bug Blocks:	1012558

Description Vincent Danen 2013-09-26 16:38:35 UTC

If realloc(3) fails then libxl_list_cpupool will incorrectly return
the now-free original pointer.

An attacker may be able to cause a multithreaded toolstack using this
function to race against itself leading to heap corruption and a
potential DoS.

Depending on the malloc implementation code execution cannot be ruled
out.


Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 1 Vincent Danen 2013-09-26 16:39:09 UTC

Statement:

Not vulnerable.

This issue does not affect the versions of the xen package as shipped with Red Hat Enterprise Linux 5 as it does not provide support for the libxl toolstack.

This issue does not affect Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG 2.

Comment 2 Vincent Danen 2013-10-10 15:40:19 UTC

External References:

http://xenbits.xen.org/xsa/advisory-70.html

Comment 3 Vincent Danen 2013-10-10 15:41:58 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1017843]