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Category:   Application (Generic)  >   Citrix XenServer Vendors:   Citrix
(Citrix Issues Fix for Citrix XenServer) Xen Qemu VGA Module Bugs Let Local Users on the Guest Deny Service on the Guest or Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1035941
SecurityTracker URL:  http://securitytracker.com/id/1035941
CVE Reference:   CVE-2016-3710, CVE-2016-3712   (Links to External Site)
Date:  May 21 2016
Impact:   Denial of service via network, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Two vulnerabilities were reported in Xen. A local user on the guest system can cause denial of service conditions on the guest system. A local user on the guest system can gain elevated privileges on the host system. Citrix XenServer is affected.

A privileged local user on the guest system can exploit a flaw in the Qemu VGA module to modify memory access modes and potentially execute arbitrary code with the privileges of the Qemu process [CVE-2016-3710].

A local user on the guest system can exploit a flaw in the Qemu VGA module to edit certain registers and trigger an out-of-bounds memory read error or integer overflow and cause denial of service conditions on the guest system [CVE-2016-3712].

Systems running on x86 with HVM guests with the qemu process running in dom0 are affected.

ARM systems are not affected.

Systems running only PV guests are not affected.

"Wei Xiao and Qinghao Tang of 360 Marvel Team" of 360.cn Inc. and Zuozhi Fzz of Alibaba Inc. reported these vulnerabilities.

Impact:   A local user on the guest system can cause denial of service conditions on the guest system.

A local user on the guest system can gain elevated privileges on the host system.

Solution:   Citrix has issued a fix for Citrix XenServer.

For 6.5 SP1: CTX212747

For 6.2 SP1: CTX212746

For 6.1: CTX212745

For 6.0.2: CTX212743

For 6.0.2 Common Criteria: CTX212744

For 6.0: CTX212742

The Citrix advisory is available at:

http://support.citrix.com/article/CTX212736

Vendor URL:  support.citrix.com/article/CTX212736 (Links to External Site)
Cause:   Access control error, Boundary error

Message History:   This archive entry is a follow-up to the message listed below.
May 9 2016 Xen Qemu VGA Module Bugs Let Local Users on the Guest Deny Service on the Guest or Gain Elevated Privileges on the Host System



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