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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen MSI Message Data Access Control Flaw Lets Local Guest Users Cause Denial of Service Conditions on Other Guest Systems
SecurityTracker Alert ID:  1032665
SecurityTracker URL:  http://securitytracker.com/id/1032665
CVE Reference:   CVE-2015-4103   (Links to External Site)
Date:  Jun 19 2015
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.0, 6.0.2, 6.1, 6.2 SP1, 6.5, 6.5 SP1
Description:   A vulnerability was reported in Xen. A local administrative user on the guest system can cause denial of service conditions on other guest systems. Citrix XenServer is affected.

A local administrative user on a guest system can write to the host MSI message data field, which may cause an error in host-based interrupt handling and adversely affect other guest systems.

x86 systems are affected. ARM systems are not affected.

HVM guest systems with their device model run in Dom0 and with access granted to physical MSI-capable PCI devices can exploit this flaw.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local administrative user on the guest system can cause denial of service conditions on other guest systems.
Solution:   Citrix has issued a fix for Citrix XenServer.

For 6.0.0: CTX142532
For 6.0.2 Common Criteria: CTX142534
For 6.0.2: CTX142533
For 6.1: CTX142535
For 6.2 SP1: CTX142536
For 6.5: CTX142537
For 6.5 SP1: CTX142538

The Citrix advisory is available at:

http://support.citrix.com/article/CTX201145

Vendor URL:  support.citrix.com/article/CTX201145 (Links to External Site)
Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Jun 2 2015 Xen MSI Message Data Access Control Flaw Lets Local Guest Users Cause Denial of Service Conditions on Other Guest Systems



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