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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen x86 Shadow Pagetable Overflow Lets Local Guest Users Deny Service and Potentially Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1035644
SecurityTracker URL:  http://securitytracker.com/id/1035644
CVE Reference:   CVE-2016-3960   (Links to External Site)
Date:  Apr 21 2016
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0, 6.0.2, 6.1, 6.2 SP1, 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 host system. A local user on the guest system can gain elevated privileges on the host system. Citrix XenServer is affected.

A local user on the guest system can trigger an integer overflow in the x86 shadow pagetable code.

On an HVM guest configured to use shadow pagetables, the local user can cause the target host system to crash.

On a PV guest configured to use shadow pagetables, the local user can cause the target host system to crash or potentially execute arbitrary code.

ARM-based systems are not affected.

Ling Liu and Yihan Lian of the Cloud Security Team, Qihoo 360, reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.

A local user on the guest system may be able to gain elevated privileges on the host system.

Solution:   Citrix has issued a hotfix for CVE-2016-3960 for Citrix XenServer.

6.5 SP1: CTX209498
6.2 SP1: CTX209497
6.1: CTX209496
6.0.2: CTX209494
6.0.2 Common Criteria: CTX209495
6.0: CTX209493

The Citrix advisory is available at:

http://support.citrix.com/article/CTX209443

Vendor URL:  support.citrix.com/article/CTX209443 (Links to External Site)
Cause:   Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
Apr 18 2016 Xen x86 Shadow Pagetable Overflow Lets Local Guest Users Deny Service and Potentially Gain Elevated Privileges on the Host System



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