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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen CMPXCHG16B Emulation Bug Lets Local Users on a Guest System Obtain Potentially Sensitive Information on the Host System
SecurityTracker Alert ID:  1037468
SecurityTracker URL:  http://securitytracker.com/id/1037468
CVE Reference:   CVE-2016-9932   (Links to External Site)
Date:  Dec 14 2016
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.4.x, 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can obtain potentially sensitive information on the host system.

A local user on the guest system can exploit a flaw in the CMPXCHG16B emulation and resize a operand to obtain a small portion of data from the hypervisor stack.

x86 systems are affected.

ARM systems are not affected.

All HVM guest user processes, including unprivileged processes, can exploit this flaw on versions 4.6 and prior.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can obtain potentially sensitive information from the hypervisor stack on the host system.
Solution:   The vendor has issued a fix (xsa200-4.6.patch and xsa200-4.7.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-200.html

Vendor URL:  xenbits.xen.org/xsa/advisory-200.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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