Bug 964259 (CVE-2013-2076)

Summary: CVE-2013-2076 kernel: xen: Information leak on XSAVE/XRSTOR capable AMD CPUs
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, pbonzini, security-response-team
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard: impact=moderate,public=20130603,reported=20130516,source=xen,cvss2=4.3/AV:A/AC:H/Au:S/C:C/I:N/A:N,rhel-5/kernel=notaffected,rhel-6/kernel=notaffected,mrg-2/realtime-kernel=notaffected,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 12:46:17 EDT Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: ---
Bug Depends On: 970206    
Bug Blocks: 964266    

Description Petr Matousek 2013-05-17 12:43:09 EDT
On AMD processors supporting XSAVE/XRSTOR (family 15h and up), when an exception is pending, these instructions save/restore only the FOP, FIP, and FDP x87 registers in FXSAVE/FXRSTOR. This allows one domain to determine portions of the state of floating point instructions of other domains.

A malicious domain may be able to leverage this to obtain sensitive information such as cryptographic keys from another domain.

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.
Comment 3 Petr Matousek 2013-05-17 12:46:17 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 12:48:49 EDT
Now public via:

http://www.openwall.com/lists/oss-security/2013/06/03/1
Comment 5 Petr Matousek 2013-06-03 12:53:50 EDT
Created xen tracking bugs for this issue

Affects: fedora-all [bug 970206]
Comment 6 Fedora Update System 2013-06-13 02:50:21 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 22:28:17 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 01:44:07 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.