Bug 956309 (CVE-2013-1952)

Summary:	CVE-2013-1952 kernel: xen: VT-d interrupt remapping source validation flaw for bridges
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, jlieskov, 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:	2013-05-02 16:37:56 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:	958919
Bug Blocks:	953634

Description Petr Matousek 2013-04-24 16:02:18 UTC

Interrupt remapping table entries for MSI interrupts set up by bridge devices did not get any source validation set up on them, allowing misbehaving or malicious guests to inject interrupts into the domain owning the bridges.

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

A malicious domain, given access to a device which bus mastering capable, 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 2013-04-24 16:05:09 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 2013-05-02 16:36:34 UTC

Now public via http://seclists.org/oss-sec/2013/q2/260.

Comment 5 Petr Matousek 2013-05-02 16:37:35 UTC

Created xen tracking bugs for this issue

Affects: fedora-all [bug 958919]