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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Grant Reference Mapping Bug Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1039174
SecurityTracker URL:  http://securitytracker.com/id/1039174
CVE Reference:   CVE-2017-12137   (Links to External Site)
Date:  Aug 16 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.x, 4.7.x, 4.8.x, 4.9.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 supply specially crafted data to trigger a flaw in the processing of guest-nominated L1 pagetable entries when mapping a grant reference and cause arbitrary code to be executed on the host system.

x86 systems are affected.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa227-4.5.patch, xsa227-4.6.patch, and xsa227.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-227.html

Vendor URL:  xenbits.xen.org/xsa/advisory-227.html (Links to External Site)
Cause:   Access control error, Input validation error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Aug 22 2017 (Citrix Issues Fix for Citrix XenServer) Xen Grant Reference Mapping Bug Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System
Citrix has issued a fix for Citrix XenServer.



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