Bug 886959 (CVE-2012-5634)

Summary:	CVE-2012-5634 kernel: xen: VT-d interrupt remapping source validation flaw
Product:	[Other] Security Response	Reporter:	Petr Matousek <pmatouse>
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, lersek, pbonzini, 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:	2013-08-24 13:50:09 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:	893568
Bug Blocks:	886962

Description Petr Matousek 2012-12-13 16:52:02 UTC

When passing a device which is behind a legacy PCI Bridge through to
a guest Xen incorrectly configures the VT-d hardware. This could allow
incorrect interrupts to be injected to other guests which also have
passthrough devices.

In a typical Xen system many devices are owned by domain 0 or driver
domains, leaving them vulnerable to such an attack. Such a DoS is
likely to have an impact on other guests running in the system.

On systems using Intel VT-d for PCI passthrough a malicious domain,
given access to a device which is behind a legacy PCI bridge, can
mount a denial of service attack affecting the whole system.

Acknowledgements:

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

Comment 3 Petr Matousek 2012-12-13 16:57:01 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 Red Hat Enterprise Linux 6 and Red Hat Enterprise MRG as we did not have support for Xen hypervisor.

Comment 4 Petr Matousek 2013-01-09 13:25:04 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 893568]

Comment 5 Fedora Update System 2013-01-23 01:28:48 UTC

xen-4.1.4-2.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 6 Fedora Update System 2013-01-23 02:05:31 UTC

xen-4.2.1-3.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.

Comment 7 Fedora Update System 2013-02-02 04:28:40 UTC

xen-4.1.4-3.fc16 has been pushed to the Fedora 16 stable repository.  If problems still persist, please make note of it in this bug report.