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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
Xen x2APIC Emulation Flaw Lets Local Guest Systems Obtain Data from Other Guest Systems or the Host System
SecurityTracker Alert ID:  1030936
SecurityTracker URL:  http://securitytracker.com/id/1030936
CVE Reference:   CVE-2014-7188   (Links to External Site)
Updated:  Oct 1 2014
Original Entry Date:  Sep 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): 4.2.x, 4.3.x, 4.4.x
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.

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:   The vendor has issued a fix (xsa108.patch; Advisory XSA-108).
Vendor URL:  www.xen.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Oct 29 2014 (Citrix Issues Fix for Citrix XenServer) Xen x2APIC Emulation Flaw Lets Local Guest Systems Obtain Data from Other Guest Systems or the Host System
Citrix has issued a fix for Citrix XenServer.



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