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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen x86 Register Write Emulation Validation Flaw Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1037342
SecurityTracker URL:  http://securitytracker.com/id/1037342
CVE Reference:   CVE-2016-9385   (Links to External Site)
Date:  Nov 24 2016
Impact:   Denial of service via network
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 cause denial of service conditions on the host system.

A local administrative user on the guest system can exploit a flaw in the validation of canonical addresses when writing to certain registers and executing certain instructions to trigger a general protection fault and cause the host system to crash.

x86 PV guests and x86 HVM guests are not affected.

ARM systems are not affected.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local administrative user on the guest system can cause the host system to crash.
Solution:   The vendor has issued a fix (xsa193-4.5.patch, xsa193-4.7.patch, and xsa193.patch).

The vendor advisory is available at:

http://xenbits.xen.org/xsa/advisory-193.html

Vendor URL:  xenbits.xen.org/xsa/advisory-193.html (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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