Bug 964264 (CVE-2013-2078)

Summary: CVE-2013-2078 kernel: xen: Hypervisor crash due to missing exception recovery on XSETBV
Product: [Other] Security Response Reporter: Petr Matousek <pmatouse>
Component: vulnerabilityAssignee: Red Hat Product Security <security-response-team>
Status: CLOSED NOTABUG QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: drjones, imammedo, pbonzini, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=important,public=20130603,reported=20130516,source=xen,cvss2=5.7/AV:A/AC:M/Au:N/C:N/I:N/A:C,fedora-all/xen=affected,rhel-5/kernel-xen=notaffected
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-05-17 12:57:14 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Bug Depends On: 970202    
Bug Blocks: 964266    

Description Petr Matousek 2013-05-17 12:53:34 EDT
Processors do certain validity checks on the register values passed to XSETBV. For the PV emulation path for that instruction the hypervisor code didn't check for certain invalid bit combinations, thus exposing itself to a fault occurring when invoking that instruction on behalf of the guest.

Malicious or buggy unprivileged user space can cause the entire host to crash.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2013-05-17 12:57:14 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 2013-06-03 12:50:54 EDT
Now public via:

http://www.openwall.com/lists/oss-security/2013/06/03/3
Comment 5 Petr Matousek 2013-06-03 12:51:57 EDT
Created xen tracking bugs for this issue

Affects: fedora-all [bug 970202]
Comment 6 Fedora Update System 2013-06-13 02:50:40 EDT
xen-4.2.2-6.fc19 has been pushed to the Fedora 19 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 7 Fedora Update System 2013-06-13 22:28:35 EDT
xen-4.2.2-6.fc18 has been pushed to the Fedora 18 stable repository.  If problems still persist, please make note of it in this bug report.
Comment 8 Fedora Update System 2013-06-16 01:44:21 EDT
xen-4.1.5-5.fc17 has been pushed to the Fedora 17 stable repository.  If problems still persist, please make note of it in this bug report.