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

Synopsis:          Important: qemu-kvm-rhev security and bug fix update
Advisory ID:       RHSA-2017:1431-01
Product:           Red Hat Virtualization
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1431
Issue date:        2017-06-13
CVE Names:         CVE-2017-7718 
=====================================================================

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):

* An out-of-bounds access issue was found in QEMU's Cirrus CLGD 54xx VGA
Emulator support. The vulnerability could occur while copying VGA data
using bitblt functions (for example, cirrus_bitblt_rop_fwd_transp_). A
privileged user inside a guest could use this flaw to crash the QEMU
process, resulting in denial of service. (CVE-2017-7718)

Red Hat would like to thank Jiangxin (PSIRT Huawei Inc.) for reporting
CVE-2017-7718.

Bug Fix(es):

* When using post-copy migration with the virtio Random Number Generator
(RNG) device, virtio-rng continued generating data while the migration was
already in post-copy mode. Consequently, the migration sometimes failed and
the error message "Failed to load virtio-rng:virtio" was displayed. The
source code has been improved and the problem no longer occurs in the
scenario described. (BZ#1450375)

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/):

1443441 - CVE-2017-7718 Qemu: display: cirrus: OOB read access issue
1450375 - Migration failed with postcopy enabled from rhel7.3.z host to rhel7.4 host "error while loading state for instance 0x0 of device 'pci@800000020000000:05.0/virtio-rng'"

6. Package List:

Managment Agent for RHEL 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.10.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.10.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.10.x86_64.rpm

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.6.0-28.el7_3.10.src.rpm

ppc64le:
qemu-img-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.10.ppc64le.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.10.ppc64le.rpm

x86_64:
qemu-img-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-common-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-rhev-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.6.0-28.el7_3.10.x86_64.rpm
qemu-kvm-tools-rhev-2.6.0-28.el7_3.10.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-2017-7718
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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