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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen GNTTABOP_swap_grant_ref() Missing Version Check Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1032568
SecurityTracker URL:  http://securitytracker.com/id/1032568
CVE Reference:   CVE-2015-4163   (Links to External Site)
Date:  Jun 12 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.2 and after
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the target host system.

The GNTTABOP_swap_grant_ref() call does not properly check the version of grant table operations. A local user on a guest system can exploit this flaw to trigger a null pointer dereference and cause denial of service conditions on the target host system.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the target host system.
Solution:   The vendor has issued a fix (xsa134*.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-134.html

Vendor URL:  xenbits.xen.org/xsa/advisory-134.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.
Jun 19 2015 (Citrix Issues Fix for Citrix XenServer) Xen GNTTABOP_swap_grant_ref() Missing Version Check Lets Local Guest Users Deny Service on the Host System
Citrix has issued a fix for Citrix XenServer 6.0.0, 6.0.2, 6.1, 6.2 SP1, 6.5, and 6.5 SP1.
Aug 3 2016 (Citrix Issues Fix for Citrix NetScaler Service Delivery Appliance) Xen GNTTABOP_swap_grant_ref() Missing Version Check Lets Local Guest Users Deny Service on the Host System
Citrix has issued a fix for Citrix NetScaler Service Delivery Appliance (SDX).



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