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Category:   Application (Generic)  >   QEMU Vendors:   QEMU.org
(Ubuntu Issues Fix for QEMU) 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:  1035878
SecurityTracker URL:  http://securitytracker.com/id/1035878
CVE Reference:   CVE-2016-3710, CVE-2016-3712   (Links to External Site)
Date:  May 12 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. QEMU 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:   Ubuntu has issued a fix for QEMU.

The Ubuntu advisory is available at:

http://www.ubuntu.com/usn/usn-2974-1

Vendor URL:  www.ubuntu.com/usn/usn-2974-1 (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 LTS, 14.04 LTS, 15.10, 16.04 LTS

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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