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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PS Table Bit Processing Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Guest System
SecurityTracker Alert ID:  1035901
SecurityTracker URL:  http://securitytracker.com/id/1035901
CVE Reference:   CVE-2016-4480   (Links to External Site)
Date:  May 17 2016
Impact:   Modification of system information, Root access via local system, 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
Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the guest system.

On a guest operating system that uses the Page Size (PS) page table entry bit in a non-standard way, a page may be processed as a page table without the operating system having designated the page as a page table.

A local user on the guest system may be able to exploit a writable page to gain elevated privileges on the guest system.

ARM systems are not affected. x86 PV guests are not affected.

The vendor is not aware of any operating systems that are affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the guest system.
Solution:   The vendor has issued a fix (xsa176.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-176.html

Vendor URL:  xenbits.xen.org/xsa/advisory-176.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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