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

Synopsis:          Important: qemu-kvm-rhev security and bug fix update
Advisory ID:       RHSA-2017:0350-01
Product:           Red Hat Virtualization
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0350.html
Issue date:        2017-03-01
CVE Names:         CVE-2016-2857 CVE-2017-2615 CVE-2017-2620 
=====================================================================

1. Summary:

An update for qemu-kvm-rhev is now available for RHEV 3.X Hypervisor and
Agents for RHEL-7 and RHEV 4.X RHEV-H and Agents for RHEL-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:

Managment Agent for RHEL 7 Hosts - ppc64le, x86_64
RHEV-H and VDSM for 7 Hosts - ppc64le, x86_64

3. Description:

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

Security Fix(es):

* Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA emulator
support is vulnerable to an out-of-bounds access issue. It could occur
while copying VGA data via bitblt copy in backward mode. A privileged user
inside a guest could use this flaw to crash the QEMU process resulting in
DoS or potentially execute arbitrary code on the host with privileges of
QEMU process on the host. (CVE-2017-2615)

* Quick emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator
support is vulnerable to an out-of-bounds access issue. The issue could
occur while copying VGA data in cirrus_bitblt_cputovideo. A privileged user
inside guest could use this flaw to crash the QEMU process OR potentially
execute arbitrary code on host with privileges of the QEMU process.
(CVE-2017-2620)

* An out-of-bounds read-access flaw was found in the QEMU emulator built
with IP checksum routines. The flaw could occur when computing a TCP/UDP
packet's checksum, because a QEMU function used the packet's payload length
without checking against the data buffer's size. A user inside a guest
could use this flaw to crash the QEMU process (denial of service).
(CVE-2016-2857)

Red Hat would like to thank Wjjzhang (Tencent.com Inc.) and Li Qiang
(360.cn Inc.) for reporting CVE-2017-2615 and Ling Liu (Qihoo 360 Inc.) for
reporting CVE-2016-2857.

Bug Fix(es):

* Prior to this update, after migrating a guest virtual machine on the
little-endian variant of IBM Power Systems and resetting the guest, the
guest boot process failed with a "tcmalloc: large alloc" error message.
This update fixes the bug, and the described problem no longer occurs.
(BZ#1420456)

* The qemu-kvm-rhev package depends on the usbredir and libcacard packages.
However, on the little-endian variant of IBM Power Systems, smartcard use
is not supported and usbredir and libcacard are thus only available in the
Optional channel. As a consequence, qemu-kvm-rhev was previously not
installable on these systems if the Optional channel was not available for
the user. This update removes usbredir and libcacard as dependencies of
qemu-kvm-rhev on little-endian IBM Power Systems, and qemu-kvm-rhev can now
be installed as expected in the described scenario. (BZ#1420428)

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/):

1296567 - CVE-2016-2857 Qemu: net: out of bounds read in net_checksum_calculate()
1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode
1420428 - Remove dependencies required by spice on ppc64le
1420456 - [ppc64le]reset vm when do migration, HMP in src host promp "tcmalloc: large alloc 1073872896 bytes..."
1420484 - CVE-2017-2620 Qemu: display: cirrus: potential arbitrary code execution via cirrus_bitblt_cputovideo

6. Package List:

Managment Agent for RHEL 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.x86_64.rpm

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.6.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.6.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.6.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.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-2016-2857
https://access.redhat.com/security/cve/CVE-2017-2615
https://access.redhat.com/security/cve/CVE-2017-2620
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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