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

Synopsis:          Important: qemu-kvm security and bug fix update
Advisory ID:       RHSA-2017:1430-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://access.redhat.com/errata/RHSA-2017:1430
Issue date:        2017-06-13
CVE Names:         CVE-2017-7718 CVE-2017-7980 
=====================================================================

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 package provides the
user-space component for running virtual machines that use KVM.

Security Fix(es):

* An out-of-bounds r/w access issue was found in QEMU's Cirrus CLGD 54xx
VGA Emulator support. The vulnerability could occur while copying VGA data
via various bitblt functions. A privileged user 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-2017-7980)

* 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) and Li Qiang (Qihoo
360 Gear Team) for reporting CVE-2017-7980 and Jiangxin (PSIRT Huawei Inc)
for reporting CVE-2017-7718.

Bug Fix(es):

* Previously, guest virtual machines in some cases became unresponsive when
the "pty" back end of a serial device performed an irregular I/O
communication. This update improves the handling of serial I/O on guests,
which prevents the described problem from occurring. (BZ#1452332)

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
1444371 - CVE-2017-7980 Qemu: display: cirrus: OOB r/w access issues in bitblt routines
1452332 - RHEL 7.2 based VM (Virtual Machine) hung for several hours apparently waiting for lock held by main_loop

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.9.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.9.x86_64.rpm

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

Source:
qemu-kvm-1.5.3-126.el7_3.9.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.9.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.9.src.rpm

ppc64:
qemu-img-1.5.3-126.el7_3.9.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.ppc64.rpm

ppc64le:
qemu-img-1.5.3-126.el7_3.9.ppc64le.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.ppc64le.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.9.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.9.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.9.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.9.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/cve/CVE-2017-7980
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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