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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen SMAP Safety Check Whitelist Error Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System
SecurityTracker Alert ID:  1036460
SecurityTracker URL:  http://securitytracker.com/id/1036460
CVE Reference:   CVE-2016-6259   (Links to External Site)
Date:  Jul 27 2016
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.0.2, 6.1.0, 6.2.0, 6.5, 7.0
Description:   A vulnerability was reported in Xen. A local user on the guest system can cause denial of service conditions on the host system. Citrix XenServer is affected.

A local user on a 32-bit PV guest system can trigger a Supervisor Mode Access Prevention (SMAP) saftey check whitelisting error to cause the target hypervisor to crash and cause denial of service conditions on other guest systems.

x86 hardware supporting the SMAP feature (e.g., Intel Broadwell and later CPUs) is affected.

64-bit PV guests and HVM guests are not affected.

ARM hardware is not affected.

Andrew Cooper of Citrix reported this vulnerability.

Impact:   A local user on the guest system can cause denial of service conditions on the host system.
Solution:   Citrix has issued a fix for CVE-2016-6259 for Citrix XenServer.

For 7.0: CTX214992
For 6.5 SP1: CTX214991
For 6.2 SP1: CTX214990
For 6.1: CTX214989
For 6.0.2: CTX214987
For 6.0.2 Common Criteria: CTX214988
For 6.0: CTX214986

The Citrix advisory is available at:

http://support.citrix.com/article/CTX214954

Vendor URL:  support.citrix.com/article/CTX214954 (Links to External Site)
Cause:   State error

Message History:   This archive entry is a follow-up to the message listed below.
Jul 26 2016 Xen SMAP Safety Check Whitelist Error Lets Local Users on a Guest System Cause Denial of Service Conditions on the Host System



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