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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen REP MOVS Acceleration Support Access Control Flaw Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1031274
SecurityTracker URL:  http://securitytracker.com/id/1031274
CVE Reference:   CVE-2014-8867   (Links to External Site)
Date:  Nov 28 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.2.x and later; possibly earlier versions
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system.

A local user on a guest system can exploit a memory access flaw in the acceleration support for the 'REP MOVS' instruction to cause the host system to crash.

x86 systems are affected. ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the target host system.
Solution:   The vendor has issued a fix (xsa112-4.2.patch, xsa112-unstable.patch; XSA-112).

[Editor's note: The vendor reports that the patch is not sufficient on Xen 3.3.x and prior without also backporting git commit b1b6362f.]

Vendor URL:  www.xen.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 11 2014 (Citrix Issues Fix for Citrix XenServer) Xen REP MOVS Acceleration Support Access Control Flaw Lets Local Guest Users Deny Service on the Host System
Citrix has issued a fix for Citrix XenServer.
Apr 8 2015 (CentOS Issues Fix) Xen REP MOVS Acceleration Support Access Control Flaw Lets Local Guest Users Deny Service on the Host System
CentOS has issued a fix for CentOS 5.



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