Bug 1012554 (CVE-2013-4369)

Summary:	CVE-2013-4369 xen: possible null dereference when parsing vif ratelimiting info (XSA-68)
Product:	[Other] Security Response	Reporter:	Vincent Danen <vdanen>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
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 16:01:21 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 16:00:05 UTC

The libxlu library function xlu_vif_parse_rate does not properly
handle inputs which consist solely of the '@' character, leading to a
NULL pointer dereference.

A toolstack which allows untrusted users to specify an arbitrary
configuration for the VIF rate can be subjected to a DOS.

The only known user of this library is the xl toolstack which does not
have a central long running daemon and therefore the impact is limited
to crashing the process which is creating the domain, which exists
only to service a single domain.


Acknowledgements:

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

Comment 1 Vincent Danen 2013-09-26 16:01:21 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 15:57:20 UTC

External References:

http://xenbits.xen.org/xsa/advisory-68.html

Comment 3 Vincent Danen 2013-10-10 15:58:45 UTC

Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1017843]