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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Page Transfer Bug Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038721
SecurityTracker URL:  http://securitytracker.com/id/1038721
CVE Reference:   CVE-2017-10912   (Links to External Site)
Updated:  Jul 7 2017
Original Entry Date:  Jun 20 2017
Impact:   Disclosure of system information, Modification of system information, 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 two guest systems (a PV and an HVM guest) can trigger a flaw in the page transfer function (GNTTABOP_transfer) to access all system memory and gain elevated privileges on the target system.

x86 systems are affected.

ARM systems are not affected.

Jann Horn of Google Project Zero reported this vulnerability.

Impact:   A local user on two guest systems can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa217-4.5.patch and xsa217.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-217.html

Vendor URL:  xenbits.xen.org/xsa/advisory-217.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   None.


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