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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Lets Local Users on a Guest System Gain Elevated Privileges or Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1039349
SecurityTracker URL:  http://securitytracker.com/id/1039349
CVE Reference:   CVE-2017-14318   (Links to External Site)
Date:  Sep 13 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5 and after
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 the guest system can trigger a null pointer deference in certain GNTTABOP_cache_flush grant table operations.

This can be exploited on ARM-based guest systems and x86-based PV guest systems that have SMAP enabled to cause the host system to crash.

This can be exploited on x86-based PV guest systems without SMAP enabled to gain elevated privileges on the host system.

Matthew Daley 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 (xsa232.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-232.html

Vendor URL:  xenbits.xen.org/xsa/advisory-232.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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