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: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: medium Docs Contact:
Priority: medium    
Version: unspecifiedCC: drjones, imammedo, jlieskov, lersek, pbonzini, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20130502,reported=20130418,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,rhel-6/kernel=notaffected,mrg-2/realtime-kernel=notaffected
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-05-02 12:37:56 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On: 958919    
Bug Blocks: 953634    

Description Petr Matousek 2013-04-24 12:02:18 EDT
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 12:05:09 EDT
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 12:36:34 EDT
Now public via http://seclists.org/oss-sec/2013/q2/260.
Comment 5 Petr Matousek 2013-05-02 12:37:35 EDT
Created xen tracking bugs for this issue

Affects: fedora-all [bug 958919]