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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PV Pagetable Update Flaw Lets Local Users on an X86 PV Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1036446
SecurityTracker URL:  http://securitytracker.com/id/1036446
CVE Reference:   CVE-2016-6258   (Links to External Site)
Date:  Jul 26 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x, 4.7.x
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

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:   The vendor has issued a fix (xsa182-4.5.patch, xsa182-4.6.patch, and xsa182.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-182.html

Vendor URL:  xenbits.xen.org/xsa/advisory-182.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.
Jul 27 2016 (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
Citrix has issued a fix for Citrix XenServer.



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