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Red Hat Security Advisory 2015-1189-01

Red Hat Security Advisory 2015-1189-01
Posted Jun 25, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1189-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled multi-TMD packets with a length above 4096 bytes. A privileged guest user in a guest with an AMD PCNet ethernet card enabled could potentially use this flaw to execute arbitrary code on the host with the privileges of the hosting QEMU process.

tags | advisory, arbitrary
systems | linux, redhat
advisories | CVE-2015-3209
SHA-256 | 39d964d6cb4b4dda9a64b2021f7fbd2ea4a581275c0694de8d847d2d82bfa972

Red Hat Security Advisory 2015-1189-01

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

Synopsis: Important: kvm security update
Advisory ID: RHSA-2015:1189-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1189.html
Issue date: 2015-06-25
CVE Names: CVE-2015-3209
=====================================================================

1. Summary:

Updated kvm packages that fix one security issue are now available for Red
Hat Enterprise Linux 5.

Red Hat Product Security has rated this update as having Important security
impact. A Common Vulnerability Scoring System (CVSS) base score, which
gives a detailed severity rating, is available from the CVE link in the
References section.

2. Relevant releases/architectures:

RHEL Desktop Multi OS (v. 5 client) - x86_64
RHEL Virtualization (v. 5 server) - x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems.

A flaw was found in the way QEMU's AMD PCnet Ethernet emulation handled
multi-TMD packets with a length above 4096 bytes. A privileged guest user
in a guest with an AMD PCNet ethernet card enabled could potentially use
this flaw to execute arbitrary code on the host with the privileges of the
hosting QEMU process. (CVE-2015-3209)

Red Hat would like to thank Matt Tait of Google's Project Zero security
team for reporting this issue.

All kvm users are advised to upgrade to these updated packages, which
contain a backported patch to correct this issue. Note: The procedure in
the Solution section must be performed before this update will 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

The following procedure must be performed before this update will take
effect:

1) Stop all KVM guest virtual machines.

2) Either reboot the hypervisor machine or, as the root user, remove (using
"modprobe -r [module]") and reload (using "modprobe [module]") all of the
following modules which are currently running (determined using "lsmod"):
kvm, ksm, kvm-intel or kvm-amd.

3) Restart the KVM guest virtual machines.

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

1225882 - CVE-2015-3209 qemu: pcnet: multi-tmd buffer overflow in the tx path

6. Package List:

RHEL Desktop Multi OS (v. 5 client):

Source:
kvm-83-273.el5_11.src.rpm

x86_64:
kmod-kvm-83-273.el5_11.x86_64.rpm
kmod-kvm-debug-83-273.el5_11.x86_64.rpm
kvm-83-273.el5_11.x86_64.rpm
kvm-debuginfo-83-273.el5_11.x86_64.rpm
kvm-qemu-img-83-273.el5_11.x86_64.rpm
kvm-tools-83-273.el5_11.x86_64.rpm

RHEL Virtualization (v. 5 server):

Source:
kvm-83-273.el5_11.src.rpm

x86_64:
kmod-kvm-83-273.el5_11.x86_64.rpm
kmod-kvm-debug-83-273.el5_11.x86_64.rpm
kvm-83-273.el5_11.x86_64.rpm
kvm-debuginfo-83-273.el5_11.x86_64.rpm
kvm-qemu-img-83-273.el5_11.x86_64.rpm
kvm-tools-83-273.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-2015-3209
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 2015 Red Hat, Inc.
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