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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Grant Table Mapping Bugs Let Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038734
SecurityTracker URL:  http://securitytracker.com/id/1038734
CVE Reference:   CVE-2017-10920, CVE-2017-10921, CVE-2017-10922   (Links to External Site)
Updated:  Jul 7 2017
Original Entry Date:  Jun 21 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:   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 trigger flaws in the mapping and unmapping of grant references to gain write access to the guest's own pagetable and obtain elevated privileges on the host system.

x86 systems running untrusted PV guests are affected.

x86 systems running untrusted HVM guests are affected if those guests are served by a trusted PV backend that is affected.

Jan Beulich of SUSE 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.

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-224.html

Vendor URL:  xenbits.xen.org/xsa/advisory-224.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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