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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen VMX Intercept Bug Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034807
SecurityTracker URL:  http://securitytracker.com/id/1034807
CVE Reference:   CVE-2016-1571   (Links to External Site)
Date:  Jan 25 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.5 SP1 and prior
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system. Citrix XenServer is affected.

A local user on the guest system can force an INVVPID instruction on a non-canonical address to trigger a hypervisor bug check and cause the host system to crash.

Systems with Intel or Cyrix CPUs are affected.

Users on HVM guests using shadow mode paging can exploit this flaw.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause the host system to crash.
Solution:   Citrix has issued a fix for CVE-2016-1571 for Citrix XenServer.

For 6.5 SP1: CTX205355

For 6.2 SP1: CTX205354

For 6.1: CTX205353

For 6.0.2: CTX205351

For 6.0.2 Common Criteria: CTX205352

For 6.0: CTX205350

The Citrix advisory is available at:

http://support.citrix.com/article/CTX205496

Vendor URL:  support.citrix.com/article/CTX205496 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jan 20 2016 Xen VMX Intercept Bug Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System



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