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

Synopsis:          Important: qemu-kvm security and bug fix update
Advisory ID:       RHSA-2017:0396-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0396.html
Issue date:        2017-03-02
CVE Names:         CVE-2017-2615 CVE-2017-2620 
=====================================================================

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):

* 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)

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

Bug Fix(es):

* When using the virtio-blk driver on a guest virtual machine with no space
on the virtual hard drive, the guest terminated unexpectedly with a "block
I/O error in device" message and the qemu-kvm process exited with a
segmentation fault. This update fixes how the system_reset QEMU signal is
handled in the above scenario. As a result, if a guest crashes due to no
space left on the device, qemu-kvm continues running and the guest can be
reset as expected. (BZ#1420049)

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/):

1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode
1420049 - system_reset should clear pending request for error (virtio-blk)
1420428 - Remove dependencies required by spice on ppc64le
1420484 - CVE-2017-2620 Qemu: display: cirrus: potential arbitrary code execution via cirrus_bitblt_cputovideo

6. Package List:

Red Hat Enterprise Linux Client (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.5.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.5.x86_64.rpm

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

Source:
qemu-kvm-1.5.3-126.el7_3.5.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.5.x86_64.rpm

Red Hat Enterprise Linux Server (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.5.src.rpm

ppc64:
qemu-img-1.5.3-126.el7_3.5.ppc64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.ppc64.rpm

ppc64le:
qemu-img-1.5.3-126.el7_3.5.ppc64le.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.ppc64le.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.5.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 7):

Source:
qemu-kvm-1.5.3-126.el7_3.5.src.rpm

x86_64:
qemu-img-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-common-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-debuginfo-1.5.3-126.el7_3.5.x86_64.rpm
qemu-kvm-tools-1.5.3-126.el7_3.5.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-2017-2615
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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