(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
SecurityTracker Alert ID: 1036081|
SecurityTracker URL: http://securitytracker.com/id/1036081
(Links to External Site)
Date: Jun 14 2016
Denial of service via network, User access via local system|
Fix Available: Yes Vendor Confirmed: Yes |
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. Red Hat Enterprise Virtualization 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.
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.
Red Hat has issued a fix for CVE-2016-3710 for Red Hat Enterprise Virtualization.|
The Red Hat advisory is available at:
Vendor URL: access.redhat.com/errata/RHSA-2016:1224 (Links to External Site)
Access control error, Boundary error|
|Underlying OS: Linux (Red Hat Enterprise)|
|Underlying OS Comments: 6|
This archive entry is a follow-up to the message listed below.|
Source Message Contents
Subject: [RHSA-2016:1224-01] Important: qemu-kvm-rhev security update|
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Red Hat Security Advisory
Synopsis: Important: qemu-kvm-rhev security update
Advisory ID: RHSA-2016:1224-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://access.redhat.com/errata/RHSA-2016:1224
Issue date: 2016-06-13
CVE Names: CVE-2016-3710
An update for qemu-kvm-rhev is now available for RHEV-H and Agents for
Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.
2. Relevant releases/architectures:
RHEV Agents (vdsm) - x86_64
KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the
user-space component for running virtual machines using KVM in environments
managed by Red Hat Enterprise Virtualization Manager.
* An out-of-bounds read/write access flaw was found in the way QEMU's VGA
emulation with VESA BIOS Extensions (VBE) support performed read/write
operations using I/O port methods. A privileged guest user could use this
flaw to execute arbitrary code on the host with the privileges of the
host's QEMU process. (CVE-2016-3710)
Red Hat would like to thank Wei Xiao (360 Marvel Team) and Qinghao Tang
(360 Marvel Team) for reporting this issue.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
After installing this update, shut down all running virtual machines. Once
all virtual machines have shut down, start them again for this update to
5. Bugs fixed (https://bugzilla.redhat.com/):
1331401 - CVE-2016-3710 qemu: incorrect banked access bounds checking in vga module
6. Package List:
RHEV Agents (vdsm):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2016 Red Hat, Inc.
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