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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for XenServer) Xen SYSENTER Processing Error Lets Local PV Guest Users Deny Service on the Host System
SecurityTracker Alert ID:  1028456
SecurityTracker URL:  http://securitytracker.com/id/1028456
CVE Reference:   CVE-2013-1917   (Links to External Site)
Date:  Apr 19 2013
Impact:   Denial of service via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.0, 5.5, 5.6, 6.0.0, 6.0.2, 6.1.0
Description:   A vulnerability was reported in Xen. A local user on the guest operating system can cause denial of service conditions on the host system. Citrix XenServer is affected.

A local user on a PV guest can issue a SYSENTER instruction to trigger a fault if the hypervisor uses IRET to return to the guest, which then will cause recovery code in the hypervisor to again use IRET without clearing a flag and the hypervisor will crash.

64-bit Xen versions 3.1 and later running on Intel CPUs are affected.

32-bit Xen is not affected.

Impact:   A local user on a PV guest operating system can cause the host operating system to crash.
Solution:   Citrix has issued a fix for Citrix XenServer.

The Citrix advisory is available at:

http://support.citrix.com/article/CTX137478

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.
Apr 19 2013 Xen SYSENTER Processing Error Lets Local PV Guest Users Deny Service on the Host System



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