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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen VMX Intercept Bug Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034745
SecurityTracker URL:  http://securitytracker.com/id/1034745
CVE Reference:   CVE-2016-1571   (Links to External Site)
Date:  Jan 20 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
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 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:   The vendor has issued a fix (xsa168.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-168.html

Vendor URL:  xenbits.xen.org/xsa/advisory-168.html (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.
Jan 25 2016 (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
Citrix has issued a fix for Citrix XenServer.



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