[RHSA-2017:0309-01] Important: qemu-kvm security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Important: qemu-kvm security and bug fix update

Advisory ID: RHSA-2017:0309-01

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2017-0309.html

Issue date: 2017-02-23

CVE Names: CVE-2016-2857 CVE-2017-2615

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1. Summary:

 

An update for qemu-kvm is now available for Red Hat Enterprise Linux 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:

 

Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64

Red Hat Enterprise Linux HPC Node (v. 6) - x86_64

Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, x86_64

Red Hat Enterprise Linux Workstation (v. 6) - i386, 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)

 

* An out-of-bounds read-access flaw was found in the QEMU emulator built

with IP checksum routines. The flaw could occur when computing a TCP/UDP

packet's checksum, because a QEMU function used the packet's payload length

without checking against the data buffer's size. A user inside a guest

could use this flaw to crash the QEMU process (denial of service).

(CVE-2016-2857)

 

Red Hat would like to thank Wjjzhang (Tencent.com Inc.) Li Qiang (360.cn

Inc.) for reporting CVE-2017-2615 and Ling Liu (Qihoo 360 Inc.) for

reporting CVE-2016-2857.

 

This update also fixes the following bug:

 

* Previously, rebooting a guest virtual machine more than 128 times in a

short period of time caused the guest to shut down instead of rebooting,

because the virtqueue was not cleaned properly. This update ensures that

the virtqueue is cleaned more reliably, which prevents the described

problem from occurring. (BZ#1408389)

 

All qemu-kvm users are advised to upgrade to these updated packages, which

contain backported patches to correct these issues. 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.

 

4. Solution:

 

Before applying this update, make sure all previously released errata

relevant to your system have been applied.

 

For details on how to apply this update, refer to:

 

https://access.redhat.com/articles/11258

 

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

 

1296567 - CVE-2016-2857 Qemu: net: out of bounds read in net_checksum_calculate()

1408389 - [RHEL6.8.z] KVM guest shuts itself down after 128th reboot

1418200 - CVE-2017-2615 Qemu: display: cirrus: oob access while doing bitblt copy backward mode

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 6):

 

Source:

qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

 

Red Hat Enterprise Linux HPC Node (v. 6):

 

Source:

qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

 

Red Hat Enterprise Linux Server (v. 6):

 

Source:

qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

 

ppc64:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.ppc64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.ppc64.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.x86_64.rpm

 

Red Hat Enterprise Linux Workstation (v. 6):

 

Source:

qemu-kvm-0.12.1.2-2.491.el6_8.6.src.rpm

 

i386:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.i686.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.i686.rpm

 

x86_64:

qemu-guest-agent-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-img-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-debuginfo-0.12.1.2-2.491.el6_8.6.x86_64.rpm

qemu-kvm-tools-0.12.1.2-2.491.el6_8.6.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-2016-2857

https://access.redhat.com/security/cve/CVE-2017-2615

https://access.redhat.com/security/updates/classification/#important

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2017 Red Hat, Inc.

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