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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Failsafe Callback Validation Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038388
SecurityTracker URL:  http://securitytracker.com/id/1038388
CVE Reference:   CVE-2017-8905   (Links to External Site)
Updated:  May 13 2017
Original Entry Date:  May 2 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.5.x, 4.6.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 a failsafe callback validation flaw to modify portions of a physical memory page not allocated to the guest to gain elevated privileges on the host system.

x86 systems with certain physical memory layouts are affected.

ARM systems are not affected.

64-bit PV guests can exploit this vulnerability.

Jann Horn of Google Project Zero 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 (xsa215.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-215.html

Vendor URL:  xenbits.xen.org/xsa/advisory-215.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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