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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen x86 Emulation Error Lets Local Guest System Users Deny Service on the Host System
SecurityTracker Alert ID:  1031127
SecurityTracker URL:  http://securitytracker.com/id/1031127
CVE Reference:   CVE-2014-7156   (Links to External Site)
Date:  Oct 29 2014
Impact:   Denial of service 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 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 software interrupts. A local user on an HVM guest system can cause the guest system to crash.

Andrei Lutas at BitDefender reported this vulnerability.

Impact:   A local user on a guest system can cause the guest system to crash.
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, State error

Message History:   This archive entry is a follow-up to the message listed below.
Sep 24 2014 Xen x86 Emulation Error Lets Local Guest System Users Deny Service on the Host System



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