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Category:   Application (Generic)  >   Red Hat Enterprise Virtualization Vendors:   Red Hat
(Red Hat Issues Fix for Red Hat Enterprise Virtualization) QEMU Firmware Configuration Processing Access Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System
SecurityTracker Alert ID:  1034860
SecurityTracker URL:  http://securitytracker.com/id/1034860
CVE Reference:   CVE-2016-1714   (Links to External Site)
Date:  Jan 29 2016
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in QEMU. 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 with CAP_SYS_RAWIO capabilities on the guest system can trigger an out-of-bounds read/write access error when processing firmware configurations and cause denial of service conditions or gain elevated privileges on the host system.

Systems with the current configuration entry value set to invalid (FW_CFG_INVALID=0xffff) are affected.

Systems built with the Firmware Configuration device emulation support are affected.

Impact:   A local privileged user on the guest system can gain elevated privileges on the host system.
Solution:   Red Hat has issued a fix for Red Hat Enterprise Virtualization.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2016-0081.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2016-0081.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Jan 28 2016 QEMU Firmware Configuration Processing Access Flaw Lets Local Users on a Guest System Gain Elevated Privileges on the Host System



 Source Message Contents

Subject:  [RHSA-2016:0081-01] Important: qemu-kvm-rhev security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: qemu-kvm-rhev security update
Advisory ID:       RHSA-2016:0081-01
Product:           Red Hat Enterprise Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2016-0081.html
Issue date:        2016-01-28
CVE Names:         CVE-2016-1714 
=====================================================================

1. Summary:

Updated qemu-kvm-rhev packages that fix one security issue are now
available for Red Hat Enterprise Virtualization.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

RHEV Agents (vdsm) - x86_64

3. Description:

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.

An out-of-bounds read/write flaw was discovered in the way QEMU's Firmware
Configuration device emulation processed certain firmware configurations.
A privileged (CAP_SYS_RAWIO) guest user could use this flaw to crash the
QEMU process instance or, potentially, execute arbitrary code on the host
with privileges of the QEMU process. (CVE-2016-1714)

Red Hat would like to thank Donghai Zhu of Alibaba for reporting this
issue.

All qemu-kvm-rhev users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. After installing
this update, shut down all running virtual machines. Once all virtual
machines have shut down, start them again for this update to take effect.

4. Solution:

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

5. Bugs fixed (https://bugzilla.redhat.com/):

1296060 - CVE-2016-1714 Qemu: nvram: OOB r/w access in processing firmware configurations

6. Package List:

RHEV Agents (vdsm):

Source:
qemu-kvm-rhev-0.12.1.2-2.479.el6_7.4.src.rpm

x86_64:
qemu-img-rhev-0.12.1.2-2.479.el6_7.4.x86_64.rpm
qemu-kvm-rhev-0.12.1.2-2.479.el6_7.4.x86_64.rpm
qemu-kvm-rhev-debuginfo-0.12.1.2-2.479.el6_7.4.x86_64.rpm
qemu-kvm-rhev-tools-0.12.1.2-2.479.el6_7.4.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and
details on how to verify the signature are available from
https://access.redhat.com/security/team/key/

7. References:

https://access.redhat.com/security/cve/CVE-2016-1714
https://access.redhat.com/security/updates/classification/#important

8. Contact:

The Red Hat security contact is <secalert@redhat.com>. More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2016 Red Hat, Inc.
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