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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen XENMEM_exchange Error Handling Bugs Let Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034391
SecurityTracker URL:  http://securitytracker.com/id/1034391
CVE Reference:   CVE-2015-8339, CVE-2015-8340   (Links to External Site)
Date:  Dec 11 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 4.3.x, 4.4.x, 4.5.x, 4.6.x
Description:   Two vulnerabilities were reported in Xen. A local administrative user on the guest system can cause denial of service conditions on the host system.

XENMEM_exchange error handling may fail in certain cases when the domain is being torn down [CVE-2015-8339].

XENMEM_exchange error handling may release a lock that was never acquired or was already released [CVE-2015-8340].

A local administrative user on the guest system can cause a deadlock on the host system or cause the host system to crash.

Julien Grall of Citrix and Jan Beulich of SUSE reported these vulnerabilities.

Impact:   A local administrative user on the guest system can cause a deadlock on the host system or cause the host system to crash.
Solution:   The vendor has issued a fix (xsa159.patch).

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-159.html

Vendor URL:  xenbits.xen.org/xsa/advisory-159.html (Links to External Site)
Cause:   Access control error, State 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 XENMEM_exchange Error Handling Bugs Let Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System
Citrix has issued a fix for Citrix XenServer.



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