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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Grant Unmapping Flaw Lets Local Users on a Guest System Gain Elevated Privileges or Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1039351
SecurityTracker URL:  http://securitytracker.com/id/1039351
CVE Reference:   CVE-2017-14319   (Links to External Site)
Date:  Sep 13 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 the guest system can cause the host system to crash.

A local user on an x86 PV guest system can exploit a flaw in grant unmapping to gain elevated privileges on the host system or cause the hypervisor to crash.

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 (xsa234-4.5.patch, xsa234-4.6.patch, xsa234-4.8.patch, xsa234-4.9.patch, and xsa234.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-234.html

Vendor URL:  xenbits.xen.org/xsa/advisory-234.html (Links to External Site)
Cause:   Input validation error
Underlying OS:  Linux (Any)

Message History:   None.


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