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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen L3 Pagetable Recursion Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1036815
SecurityTracker URL:  http://securitytracker.com/id/1036815
CVE Reference:   CVE-2016-7092   (Links to External Site)
Date:  Sep 15 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0 - 7.0
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system. Citrix XenServer is affected.

A local administrative user on a 32-bit PV guest system can exploit a flaw in the L3 pagetable entry recursion code in the 64-bit hypervisor running on x86 hardware to gain elevated privileges on the host system.

Jeremie Boutoille of Quarkslab and Shangcong Luan of Alibaba Cloud separately reported this vulnerability.

Impact:   A local administrative user on the guest system can gain elevated privileges on the host system.
Solution:   Citrix has issued a fix for CVE-2016-7092 for Citrix XenServer.

7.0: CTX216463
6.5 SP1: CTX216462
6.2 SP1: CTX216461
6.1: CTX216460
6.0.2: CTX216458
6.0.2 Common Criteria: CTX216459
6.0: CTX216457

The Citrix advisory is available at:

http://support.citrix.com/article/CTX216071

Vendor URL:  support.citrix.com/article/CTX216071 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Sep 8 2016 Xen L3 Pagetable Recursion Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Host System



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