Bug 1006431 (CVE-2013-1442)

Summary: CVE-2013-1442 kernel: xen: information leak on AVX and/or LWP capable 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:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
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Clone Of: Environment:
Last Closed: 2013-09-10 15:38:05 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: 1012056    
Bug Blocks: 1006302    

Description Petr Matousek 2013-09-10 15:36:28 UTC 
When a guest increases the set of extended state components for a vCPU saved/restored via XSAVE/XRSTOR (to date this can only be the upper halves of YMM registers, or AMD's LWP state) after already having touched other extended registers restored via XRSTOR (e.g. floating point or XMM ones) during its current scheduled CPU quantum, the hypervisor would make those registers accessible without discarding the values an earlier scheduled vCPU may have left in them.

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 2013-09-10 15:38:05 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 2 as we did not have support for Xen hypervisor.
Comment 4 Vincent Danen 2013-09-25 15:40:35 UTC 
External References:

http://xenbits.xen.org/xsa/advisory-62.html
Comment 5 Vincent Danen 2013-09-25 15:45:01 UTC 
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1012056]