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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Exception Handling Bugs Let Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1034205
SecurityTracker URL:  http://securitytracker.com/id/1034205
CVE Reference:   CVE-2015-5307, CVE-2015-8104   (Links to External Site)
Date:  Nov 20 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 user on the guest system can cause denial of service conditions on the host system. Citrix XenServer is affected.

The processing of benign exceptions may result in an infinite loop in the CPU. A local user on the guest system can exploit this to cause denial of service conditions on the host system.

An alignment check exception may be triggered by a 32-bit guest [CVE-2015-5307].

A debug exception can be triggered [CVE-2015-8104].

ARM is not affected.

x86 PV VMs are not affected.

x86 CPUs from all manufacturers are affected.

Ben Serebrin from Google and Jan Beulich from SUSE reported these vulnerabilities.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   Citrix has issued a fix for CVE-2015-5307 and CVE-2015-8104 for Citrix XenServer.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX202583

Vendor URL:  support.citrix.com/article/CTX202583 (Links to External Site)
Cause:   Exception handling error

Message History:   This archive entry is a follow-up to the message listed below.
Nov 10 2015 Xen Exception Handling Bugs Let Local Users on a Guest System Cause Denial of Service Conditions on the Host System



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