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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(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
SecurityTracker Alert ID:  1039217
SecurityTracker URL:  http://securitytracker.com/id/1039217
CVE Reference:   CVE-2017-12137   (Links to External Site)
Date:  Aug 22 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.2, 6.2.0, 6.5, 7.0, 7.1, 7.2
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 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:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

https://support.citrix.com/article/CTX225941

Vendor URL:  support.citrix.com/article/CTX225941 (Links to External Site)
Cause:   Access control error, Input validation error

Message History:   This archive entry is a follow-up to the message listed below.
Aug 16 2017 Xen Grant Reference Mapping Bug Lets Local Users on a PV Guest System Gain Elevated Privileges on the Host System



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