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Red Hat Security Advisory 2015-1000-01

Red Hat Security Advisory 2015-1000-01
Posted May 13, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1000-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the user-space component for running virtual machines using KVM. An out-of-bounds memory access flaw was found in the way QEMU's virtual Floppy Disk Controller handled FIFO buffer access while processing certain FDC commands. A privileged guest user could use this flaw to crash the guest or, potentially, execute arbitrary code on the host with the privileges of the host's QEMU process corresponding to the guest.

tags | advisory, arbitrary
systems | linux, redhat
advisories | CVE-2015-3456
SHA-256 | 03f03d53cedd59584831f1b0029666475f5a81ddb57f12c6ce52d258b2f1a3cd

Red Hat Security Advisory 2015-1000-01

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

Synopsis: Important: qemu-kvm-rhev security update
Advisory ID: RHSA-2015:1000-01
Product: Red Hat Enterprise Virtualization
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1000.html
Issue date: 2015-05-13
CVE Names: CVE-2015-3456
=====================================================================

1. Summary:

Updated qemu-kvm-rhev packages that fix one security issue are now
available for Red Hat Enterprise Virtualization Hypervisor 7.

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:

RHEV-H and VDSM for 7 Hosts - x86_64

3. Description:

KVM (Kernel-based Virtual Machine) is a full virtualization solution for
Linux on AMD64 and Intel 64 systems. The qemu-kvm-rhev package provides the
user-space component for running virtual machines using KVM.

An out-of-bounds memory access flaw was found in the way QEMU's virtual
Floppy Disk Controller (FDC) handled FIFO buffer access while processing
certain FDC commands. A privileged guest user could use this flaw to crash
the guest or, potentially, execute arbitrary code on the host with the
privileges of the host's QEMU process corresponding to the guest.
(CVE-2015-3456)

Red Hat would like to thank Jason Geffner of CrowdStrike for reporting
this issue.

All qemu-kvm-rhev users are advised to upgrade to these updated packages,
which contain a backported patch to correct this issue. 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/):

1218611 - CVE-2015-3456 qemu: fdc: out-of-bounds fifo buffer memory access

6. Package List:

RHEV-H and VDSM for 7 Hosts:

Source:
qemu-kvm-rhev-2.1.2-23.el7_1.3.src.rpm

x86_64:
libcacard-devel-rhev-2.1.2-23.el7_1.3.x86_64.rpm
libcacard-rhev-2.1.2-23.el7_1.3.x86_64.rpm
libcacard-tools-rhev-2.1.2-23.el7_1.3.x86_64.rpm
qemu-img-rhev-2.1.2-23.el7_1.3.x86_64.rpm
qemu-kvm-common-rhev-2.1.2-23.el7_1.3.x86_64.rpm
qemu-kvm-rhev-2.1.2-23.el7_1.3.x86_64.rpm
qemu-kvm-rhev-debuginfo-2.1.2-23.el7_1.3.x86_64.rpm
qemu-kvm-tools-rhev-2.1.2-23.el7_1.3.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-2015-3456
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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