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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Lets Local Users on a Guest System Obtain Register Contents from the Target Guest System
SecurityTracker Alert ID:  1035435
SecurityTracker URL:  http://securitytracker.com/id/1035435
CVE Reference:   CVE-2016-3158, CVE-2016-3159   (Links to External Site)
Date:  Mar 29 2016
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
Description:   Two vulnerabilities were reported in Xen. A local user on the guest system can gain obtain potentially sensitive register contents from the guest system.

A local user on a guest system can obtain potentially sensitive information from registers containing FPU instructions, data pointers, and opcodes for another guest system.

This can be exploited to determine address space usage and timing information about the target domain.

AMD x86 systems are affected.

Both PV and HVM guests are affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can gain obtain potentially sensitive register contents from another guest system.
Solution:   The vendor has issued a fix (xsa172-4.3.patch and xsa172.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-172.html

Vendor URL:  xenbits.xen.org/xsa/advisory-172.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.
Apr 21 2016 (Citrix Issues Fix for Citrix XenServer) Xen Lets Local Users on a Guest System Obtain Register Contents from the Target Guest System
Citrix has issued a fix for Citrix XenServer.



 Source Message Contents



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