[RHSA-2017:1205-01] Important: qemu-kvm-rhev security update

Tue May 9 18:10:25 UTC 2017

An update for qemu-kvm-rhev is now available for RHEV 3.X Hypervisor and
Agents for RHEL-6.

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

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):

* 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)

* Quick Emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator
support is vulnerable to an out-of-bounds r/w access issue. The
vulnerability could occur while copying VGA data via various bitblt
functions. A privileged user inside the guest could use this flaw to crash
the QEMU process (DoS) or potentially execute arbitrary code on a host with
privileges of the host's QEMU process. (CVE-2017-7980)

* Quick Emulator (QEMU) built with the VNC display driver support is
vulnerable to an out-of-bounds memory access issue. The vulnerability could
occur while refreshing the VNC display surface area in the
'vnc_refresh_server_surface'. A user/process inside the guest could use
this flaw to crash the QEMU process, resulting in a DoS. (CVE-2017-2633)

* Quick Emulator (QEMU) built with the Cirrus CLGD 54xx VGA Emulator
support is vulnerable to an out-of-bounds access issue. 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 DoS. (CVE-2017-7718)

Red Hat would like to thank Jiangxin (PSIRT Huawei Inc.) Li Qiang (Qihoo
360 Gear Team) for reporting CVE-2017-7980 and Jiangxin (PSIRT Huawei Inc.)
for reporting CVE-2017-7718.

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/):

1425939 - CVE-2017-2633 Qemu: VNC: memory corruption due to unchecked resolution limit
1430056 - CVE-2016-9603 Qemu: cirrus: heap buffer overflow via vnc connection
1443441 - CVE-2017-7718 Qemu: display: cirrus: OOB read access issue
1444371 - CVE-2017-7980 Qemu: display: cirrus: OOB r/w access issues in bitblt routines

6. Package List:

RHEV Agents (vdsm):

Source:
qemu-kvm-rhev-0.12.1.2-2.503.el6_9.3.src.rpm

x86_64:
qemu-img-rhev-0.12.1.2-2.503.el6_9.3.x86_64.rpm
qemu-kvm-rhev-0.12.1.2-2.503.el6_9.3.x86_64.rpm
qemu-kvm-rhev-debuginfo-0.12.1.2-2.503.el6_9.3.x86_64.rpm
qemu-kvm-rhev-tools-0.12.1.2-2.503.el6_9.3.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/cve/CVE-2017-2633
https://access.redhat.com/security/cve/CVE-2017-7718
https://access.redhat.com/security/cve/CVE-2017-7980
https://access.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2017 Red Hat, Inc.
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