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

Synopsis:          Important: kvm security update
Advisory ID:       RHSA-2017:0454-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2017-0454.html
Issue date:        2017-03-07
CVE Names:         CVE-2017-2615 CVE-2017-2620 
=====================================================================

1. Summary:

An update for kvm is now available for Red Hat Enterprise Linux 5.

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 Desktop Multi OS (v. 5 client) - x86_64
Red Hat Enterprise Linux Virtualization (v. 5 server) - x86_64

3. Description:

KVM (for Kernel-based Virtual Machine) is a full virtualization solution
for Linux on x86 hardware. Using KVM, one can run multiple virtual machines
running unmodified Linux or Windows images. Each virtual machine has
private virtualized hardware: a network card, disk, graphics adapter, etc.

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.

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

Note: The procedure in the Solution section must be performed before this
update will take effect.

5. Bugs fixed (https://bugzilla.redhat.com/):

1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode
1420484 - CVE-2017-2620 Qemu: display: cirrus: potential arbitrary code execution via cirrus_bitblt_cputovideo

6. Package List:

Red Hat Enterprise Linux Desktop Multi OS (v. 5 client):

Source:
kvm-83-277.el5_11.src.rpm

x86_64:
kmod-kvm-83-277.el5_11.x86_64.rpm
kmod-kvm-debug-83-277.el5_11.x86_64.rpm
kvm-83-277.el5_11.x86_64.rpm
kvm-debuginfo-83-277.el5_11.x86_64.rpm
kvm-qemu-img-83-277.el5_11.x86_64.rpm
kvm-tools-83-277.el5_11.x86_64.rpm

Red Hat Enterprise Linux Virtualization (v. 5 server):

Source:
kvm-83-277.el5_11.src.rpm

x86_64:
kmod-kvm-83-277.el5_11.x86_64.rpm
kmod-kvm-debug-83-277.el5_11.x86_64.rpm
kvm-83-277.el5_11.x86_64.rpm
kvm-debuginfo-83-277.el5_11.x86_64.rpm
kvm-qemu-img-83-277.el5_11.x86_64.rpm
kvm-tools-83-277.el5_11.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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