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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Grant Table Unmapping Bugs Let Local Users on the Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038722
SecurityTracker URL:  http://securitytracker.com/id/1038722
CVE Reference:   CVE-2017-10913, CVE-2017-10914   (Links to External Site)
Updated:  Jul 7 2017
Original Entry Date:  Jun 20 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
Description:   Two vulnerabilities were 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 trigger a race condition in the unmapping of grant table references to gain elevated privileges on the host system.

Concurrent unmap calls may allow a backend to read and write memory belonging to a frontend [CVE-2017-10913].

Grant maptrack entries may be freed twice and reused [CVE-2017-10914].

ARM and x86 are affected.

On x86, systems with either PV or HVM guests are affected.

Jann Horn of Google Project Zero reported these vulnerabilities.

Impact:   A local user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix.

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-218.html

Vendor URL:  xenbits.xen.org/xsa/advisory-218.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Any)

Message History:   None.


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