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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Qemu Cirrus VGA Heap Overflow Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1038023
SecurityTracker URL:  http://securitytracker.com/id/1038023
CVE Reference:   CVE-2016-9603   (Links to External Site)
Date:  Mar 15 2017
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Xen. A local user on the guest system can gain elevated privileges on the host system.

A local administrative user on the guest system can trigger a heap overflow in the Cirrus VGA emulator to execute arbitrary code with the privileges of the device model process and potentially gain elevated privileges on the host system.

HVM guest systems with the Cirrus video card are affected.

Impact:   A local administrative user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa211-qemuu.patch, xsa211-qemuu-4.8.patch, xsa211-qemuu-4.7.patch, xsa211-qemuu-4.6.patch, xsa211-qemuu-4.4.patch, xsa211-qemut.patch, xsa211-qemut-4.5.patch).

The vendor advisory is available at:

https://xenbits.xen.org/xsa/advisory-211.html

Vendor URL:  xenbits.xen.org/xsa/advisory-211.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any)

Message History:   None.


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