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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen PV Pagetable Update Flaw Lets Local Users on an X86 PV Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1036459
SecurityTracker URL:  http://securitytracker.com/id/1036459
CVE Reference:   CVE-2016-6258   (Links to External Site)
Date:  Jul 27 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.2, 6.1.0, 6.2.0, 6.5, 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 administration user on a PV guest system can exploit a flaw in the updating of PV pagetable entries to gain elevated privileges on the host system.

PV guests on x86 hardware are affected.

x86 HVM guests and ARM guests are not affected.

Jeremie Boutoille of Quarkslab 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-2016-6258 for Citrix XenServer.

For 7.0: CTX214992
For 6.5 SP1: CTX214991
For 6.2 SP1: CTX214990
For 6.1: CTX214989
For 6.0.2: CTX214987
For 6.0.2 Common Criteria: CTX214988
For 6.0: CTX214986

The Citrix advisory is available at:

http://support.citrix.com/article/CTX214954

Vendor URL:  support.citrix.com/article/CTX214954 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jul 26 2016 Xen PV Pagetable Update Flaw Lets Local Users on an X86 PV Guest System Gain Elevated Privileges on the Host System



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