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Red Hat Security Advisory 2017-0987-01

Red Hat Security Advisory 2017-0987-01
Posted Apr 19, 2017
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2017-0987-01 - Kernel-based Virtual Machine is a full virtualization solution for Linux on a variety of architectures. The qemu-kvm packages provide the user-space component for running virtual machines that use KVM. Security Fix: A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA emulator's VNC display driver support; the issue could occur when a VNC client attempted to update its display after a VGA operation is performed by a guest. A privileged user/process inside a guest could use this flaw to crash the QEMU process or, potentially, execute arbitrary code on the host with privileges of the QEMU process.

tags | advisory, overflow, arbitrary, kernel
systems | linux, redhat
advisories | CVE-2016-9603
SHA-256 | 644727d84aca416d3dd02e5d12fd3896099ec52380e4c5ba4156e4de68fa4cd4

Red Hat Security Advisory 2017-0987-01

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

Synopsis: Important: qemu-kvm security update
Advisory ID: RHSA-2017:0987-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2017:0987
Issue date: 2017-04-18
CVE Names: CVE-2016-9603
=====================================================================

1. Summary:

An update for qemu-kvm is now available for Red Hat Enterprise Linux 7.

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:

Red Hat Enterprise Linux Client (v. 7) - x86_64
Red Hat Enterprise Linux ComputeNode Optional (v. 7) - x86_64
Red Hat Enterprise Linux Server (v. 7) - ppc64, ppc64le, x86_64
Red Hat Enterprise Linux Workstation (v. 7) - x86_64

3. Description:

Kernel-based Virtual Machine (KVM) is a full virtualization solution for
Linux on a variety of architectures. The qemu-kvm packages provide the
user-space component for running virtual machines that use KVM.

Security Fix(es):

* A heap buffer overflow flaw was found in QEMU's Cirrus CLGD 54xx VGA
emulator's VNC display driver support; the issue could occur when a VNC
client attempted to update its display after a VGA operation is performed
by a guest. A privileged user/process inside a guest could use this flaw to
crash the QEMU process or, potentially, execute arbitrary code on the host
with privileges of the QEMU process. (CVE-2016-9603)

4. Solution:

For details on how to apply this update, which includes the changes
described in this advisory, refer to:

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

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.

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

1430056 - CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.6.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.6.x86_64.rpm

Red Hat Enterprise Linux ComputeNode Optional (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.6.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.6.src.rpm

ppc64:
qemu-img-1.5.3-126.el7_3.6.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.ppc64.rpm

ppc64le:
qemu-img-1.5.3-126.el7_3.6.ppc64le.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.ppc64le.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.6.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.6.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.6.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-2016-9603
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 2017 Red Hat, Inc.
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