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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: drjones, imammedo, lersek, pbonzini, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20130108,reported=20121213,source=upstream,cvss2=5.2/AV:A/AC:M/Au:S/C:N/I:N/A:C,rhel-5/kernel-xen=notaffected,fedora-all/xen=affected
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-08-24 09:50:09 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On: 893568    
Bug Blocks: 886962    

Description Petr Matousek 2012-12-13 11:52:02 EST
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 11:57:01 EST
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 08:25:04 EST
Created xen tracking bugs for this issue

Affects: fedora-all [bug 893568]
Comment 5 Fedora Update System 2013-01-22 20:28:48 EST
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 2013-01-22 21:05:31 EST
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 2013-02-01 23:28:40 EST
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.