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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen x86 Instruction Emulation Flaw Lets Local Guest Users Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1031126
SecurityTracker URL:  http://securitytracker.com/id/1031126
CVE Reference:   CVE-2014-7155   (Links to External Site)
Date:  Oct 29 2014
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.2 SP1 and prior versions
Description:   A vulnerability was reported in Xen. A local user on a guest system can obtain elevated privileges or cause denial of service conditions on the guest system. Citrix XenServer is affected.

The x86 emulation code does not properly check supervisor mode permissions of HLT, LGDT, LIDT, and LMSW instructions. A local user on an HVM guest system can obtain guest kernel privileges or cause the guest system to crash.

Andrei Lutas at BitDefender reported this vulnerability.

Impact:   A local user on a guest system can obtain elevated privileges or cause denial of service conditions on the guest system.
Solution:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX200218

Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Sep 24 2014 Xen x86 Instruction Emulation Flaw Lets Local Guest Users Gain Elevated Privileges on the Guest System



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