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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen PV Superpage Hypercalls Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1034744
SecurityTracker URL:  http://securitytracker.com/id/1034744
CVE Reference:   CVE-2016-1570   (Links to External Site)
Date:  Jan 20 2016
Impact:   Denial of service via local system, Disclosure of system information, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.4.0, 3.4.1, 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 host system.

A local user on a PV guest system can exploit a validation flaw in the PV superpage functionality HYPERVISOR_mmuext_op hypercall (MMUEXT_MARK_SUPER and MMUEXT_UNMARK_SUPER sub-ops) and page table updates to obtain information, deny service, or gain elevated privileges on the host system.

Th PV superpage feature is disabled by default.

x86 systems are affected.

Qinghao Tang of 360 Marvel Team reported this vulnerability.

Impact:   A local user on the guest system can obtain information, cause denial of service conditions, or gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa167-4.4.patch, xsa167-4.6.patch, and xsa167.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-167.html

Vendor URL:  xenbits.xen.org/xsa/advisory-167.html (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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