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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen x2APIC Emulation Flaw Lets Local Guest Systems Obtain Data from Other Guest Systems or the Host System
SecurityTracker Alert ID:  1031128
SecurityTracker URL:  http://securitytracker.com/id/1031128
CVE Reference:   CVE-2014-7188   (Links to External Site)
Date:  Oct 29 2014
Impact:   Denial of service via local system, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.2 SP1 and prior versions
Description:   A vulnerability was reported in Xen. A local user on a guest system and cause the host system to crash. A local user on a guest system can read data from other guest systems or from the host system. Citrix XenServer is affected.

The x2APIC emulation code uses an incorrect model-specific register (MSR) range for Advanced Programmable Interrupt Controller (APIC) use. A local user on a guest system can exploit this to read portions of hypervisor memory.

x86 systems are affected. ARM-based systems are not affected.

Jan Beulich at SUSE reported this vulnerability.

Impact:   A local user on a guest system and cause the host system to crash.

A local user on a guest system can obtain data from other guest systems or from the host system.

Solution:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX200218

Cause:   Access control error

Message History:   This archive entry is a follow-up to the message listed below.
Sep 29 2014 Xen x2APIC Emulation Flaw Lets Local Guest Systems Obtain Data from Other Guest Systems or the Host System



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