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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen x86 Far Instruction Emulation Flaw Lets Local Users Gain Elevated Privileges or Deny Service on the Guest System
SecurityTracker Alert ID:  1031351
SecurityTracker URL:  http://securitytracker.com/id/1031351
CVE Reference:   CVE-2014-8595   (Links to External Site)
Date:  Dec 11 2014
Impact:   Denial of service via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on a guest system can obtain elevated privileges on the target guest system. A local user on a guest system can cause denial of service conditions on the guest system. Citrix XenServer is affected.

The emulation of far branch instructions does not properly enforce access controls. A local user on an HVM guest may be able to obtain guest supervisor mode privileges or cause the guest to crash.

x86 systems are affected. ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

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

For 6.0.0: CTX141721
For 6.0.2 Common Criteria: CTX141719
For 6.0.2: CTX141720
For 6.1: CTX141718
For 6.2 Service Pack 1: CTX141717

The Citrix advisory is available at:

http://support.citrix.com/article/CTX200288

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

Message History:   This archive entry is a follow-up to the message listed below.
Nov 28 2014 Xen x86 Far Instruction Emulation Flaw Lets Local Users Gain Elevated Privileges or Deny Service on the Guest System



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