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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(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
SecurityTracker Alert ID:  1034517
SecurityTracker URL:  http://securitytracker.com/id/1034517
CVE Reference:   CVE-2015-8339, CVE-2015-8340   (Links to External Site)
Date:  Dec 22 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.5 SP1 and prior
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. Citrix XenServer is affected.

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:   Citrix has issued a fix for Citrix XenServer.

For 6.5 SP1: CTX203494

For 6.2 SP1: CTX203492

For 6.1: CTX203491

For 6.0.2: CTX203489

For 6.0.2 Common Criteria: CTX203490

For 6.0: CTX203488

The Citrix advisory is available at:

http://support.citrix.com/article/CTX203451

Vendor URL:  support.citrix.com/article/CTX203451 (Links to External Site)
Cause:   Access control error, State error

Message History:   This archive entry is a follow-up to the message listed below.
Dec 11 2015 Xen XENMEM_exchange Error Handling Bugs Let Local Administrative Users on a Guest System Cause Denial of Service Conditions on the Host System



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