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Category:   Application (Generic)  >   Xen Vendors:   Xen Project
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:  1035794
SecurityTracker URL:  http://securitytracker.com/id/1035794
CVE Reference:   CVE-2016-3710, CVE-2016-3712   (Links to External Site)
Date:  May 9 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.

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:   The vendor has issued a fix.

The vendor's advisory is available at:

http://xenbits.xen.org/xsa/advisory-179.html

Vendor URL:  xenbits.xen.org/xsa/advisory-179.html (Links to External Site)
Cause:   Access control error, Boundary error
Underlying OS:  Linux (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
May 9 2016 (Red Hat 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
Red Hat has issued a fix for QEMU for Red Hat Enterprise Linux 7.
May 9 2016 (CentOS 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
CentOS has issued a fix for QEMU for CentOS 7.
May 12 2016 (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
Ubuntu has issued a fix for QEMU for Ubuntu Linux 12.04 LTS, 14.04 LTS, 15.10, and 16.04 LTS.
May 21 2016 (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
Citrix has issued a fix for Citrix XenServer.
Jun 14 2016 (Red Hat Issues Fix for Red Hat Enterprise Virtualization) Xen Qemu VGA Module Bugs Let Local Users on the Guest Deny Service on the Guest or Gain Elevated Privileges on the Host System
Red Hat has issued a fix for Red Hat Enterprise Virtualization for Red Hat Enterprise Linux.
Aug 12 2016 (Oracle Issues Fix for Oracle Linux 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
Oracle has issued a fix for QEMU for Oracle Linux 7.
Sep 27 2016 (Red Hat Issues Fix for KVM) Xen Qemu VGA Module Bugs Let Local Users on the Guest Deny Service on the Guest or Gain Elevated Privileges on the Host System
Red Hat has issued a fix for KVM for Red Hat Enterprise Linux 5.



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