Bug 953632 (CVE-2013-1964)

Summary:	CVE-2013-1964 xen: grant table hypercall acquire/release imbalance
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED NOTABUG	QA Contact:
Severity:	high	Docs Contact:
Priority:	high
Version:	unspecified	CC:	agordeev, anton, bhu, dhoward, drjones, esammons, fhrbata, iboverma, imammedo, jforbes, jkacur, kernel-mgr, kraxel, lersek, lgoncalv, lwang, m.a.young, mcressma, mrezanin, npajkovs, pbonzini, plougher, rt-maint, rvrbovsk, virt-maint, williams, xen-maint
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:	2013-06-06 16:22:08 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:	953633
Bug Blocks:	953634

Description Petr Matousek 2013-04-18 18:06:26 UTC

When releasing a non-v1 non-transitive grant after doing a grant copy operation, Xen incorrectly recurses (as if for a transitive grant) and releases an unrelated grant reference.

A malicious guest administrator can cause undefined behaviour; depending on the dom0 kernel a host crash is possible, but information leakage or privilege escalation cannot be ruled out.

References:

http://permalink.gmane.org/gmane.comp.security.oss.general/9978

Acknowledgements:

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

Comment 1 Petr Matousek 2013-04-18 18:07:20 UTC

Statement:

Not vulnerable.

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

This issue did not affect the versions of the Linux kernel as shipped with Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.

Comment 2 Petr Matousek 2013-04-18 18:08:32 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 953633]

Comment 3 Fedora Update System 2013-05-05 02:24:52 UTC

xen-4.1.5-1.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.