Bug 1033138 (CVE-2013-6375)

Summary: CVE-2013-6375 xen: Insufficient TLB flushing in VT-d (iommu) code
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: agordeev, anton, dhoward, drjones, imammedo, jforbes, jkurik, kraxel, lwang, m.a.young, mrezanin, pbonzini, pholasek, plougher, rkrcmar, rvrbovsk, virt-maint, xen-maint
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2013-11-21 15:41:32 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Bug Depends On: 1033149    
Bug Blocks: 1033150    

Description Petr Matousek 2013-11-21 15:37:58 UTC
An inverted boolean parameter resulted in TLB flushes not happening upon clearing of a present translation table entry.  Retaining stale TLB entries could allow guests access to memory that ought to have
been revoked, or grant greater access than intended.

Malicious guest administrators might be able to cause host-wide denial of service, or escalate their privilege to that of the host.

References:
http://seclists.org/oss-sec/2013/q4/322

Acknowledgements:

Red Hat would like to thank the Xen project for reporting this issue.

Comment 1 Petr Matousek 2013-11-21 15:41:32 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 as we did not have support for Xen hypervisor.

Comment 2 Petr Matousek 2013-11-21 15:46:57 UTC
Created xen tracking bugs for this issue:

Affects: fedora-all [bug 1033149]