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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen Buffer Overflow in qemu-dm Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1034481
SecurityTracker URL:  http://securitytracker.com/id/1034481
CVE Reference:   CVE-2015-8554   (Links to External Site)
Date:  Dec 17 2015
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can gain elevated privileges on the host system.

A local administrative user on the guest system can trigger a buffer overflow in 'qemu-xen-traditional' (i.e., 'qemu-dm') in the processing of MSI-X table entries to execute arbitrary code with the privileges of the QEMU process.

Guest systems that have access to a passed-through PCI device that is MSI-X capable can exploit this flaw.

Systems running only PV guests are affected.

Systems using PCI passthrough are affected.

ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local administrative user on the guest system can gain elevated privileges on the host system.
Solution:   The vendor has issued a fix (xsa164.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-164.html

Vendor URL:  xenbits.xen.org/xsa/advisory-164.html (Links to External Site)
Cause:   Boundary error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Dec 22 2015 (Citrix Issues Fix for Citrix XenServer) Xen Buffer Overflow in qemu-dm Lets Local Administrative Users on a Guest System Gain Elevated Privileges on the Host System
Citrix has issued a fix for Citrix XenServer.



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