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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Lock Order Bug Lets Local Guest Administrative Users Deny Service on the Host System
SecurityTracker Alert ID:  1029663
SecurityTracker URL:  http://securitytracker.com/id/1029663
CVE Reference:   CVE-2013-4494   (Links to External Site)
Date:  Jan 22 2014
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.6, 6.0, 6.1, 6.2
Description:   A vulnerability was reported in Xen. A local administrative user on the guest operating system can cause denial of service conditions on the host system. Citrix XenServer is affected.

A local administrative user on the guest operating system in control of more than one vcpu can trigger a lock order bug between page allocation locks (page_alloc_lock) and grant table locks (grant_table.lock) to cause denial of service conditions on the host system.

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

The Citrix advisory is available at:

http://support.citrix.com/article/CTX140038

Vendor URL:  www.xen.org/ (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Nov 1 2013 Xen Lock Order Bug Lets Local Guest Administrative Users Deny Service on the Host System



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