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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen GNTTABOP_swap_grant_ref() Missing Version Check Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1032669
SecurityTracker URL:  http://securitytracker.com/id/1032669
CVE Reference:   CVE-2015-4163   (Links to External Site)
Date:  Jun 19 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.0, 6.0.2, 6.1, 6.2 SP1, 6.5, 6.5 SP1
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. Citrix XenServer is affected.

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:   Citrix has issued a fix for Citrix XenServer.

For 6.0.0: CTX142532
For 6.0.2 Common Criteria: CTX142534
For 6.0.2: CTX142533
For 6.1: CTX142535
For 6.2 SP1: CTX142536
For 6.5: CTX142537
For 6.5 SP1: CTX142538

The Citrix advisory is available at:

http://support.citrix.com/article/CTX201145

Vendor URL:  support.citrix.com/article/CTX201145 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 12 2015 Xen GNTTABOP_swap_grant_ref() Missing Version Check Lets Local Guest Users Deny Service on the Host System



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