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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1032664
SecurityTracker URL:  http://securitytracker.com/id/1032664
CVE Reference:   CVE-2015-2756   (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 user on the guest system can cause denial of service conditions on the target host system. Citrix XenServer is affected.

A local user on an HVM guest system can modify the PCI command register of a device passed through to the guest to trigger unsupported request responses that, in certain cases, may cause the host system to crash.

Only x86 systems are affected.

ARM systems are not affected.

Jan Beulich of SUSE reported this vulnerability.

Impact:   A local user on the guest system can cause the target host system to crash.
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:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Apr 1 2015 Xen QEMU PCI Comman Register Access Lets Local Guest Users Deny Service on the Host System



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