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Red Hat Security Advisory 2015-1031-01

Red Hat Security Advisory 2015-1031-01
Posted May 28, 2015
Authored by Red Hat | Site access.redhat.com

Red Hat Security Advisory 2015-1031-01 - KVM is a full virtualization solution for Linux on AMD64 and Intel 64 systems. The qemu-kvm 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
MD5 | d80881eb06c32d942c602b12c7164538

Red Hat Security Advisory 2015-1031-01

Change Mirror Download
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=====================================================================
Red Hat Security Advisory

Synopsis: Important: qemu-kvm security update
Advisory ID: RHSA-2015:1031-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2015-1031.html
Issue date: 2015-05-27
CVE Names: CVE-2015-3456
=====================================================================

1. Summary:

Updated qemu-kvm packages that fix one security issue are now available for
Red Hat Enterprise Linux 6.5 Extended Update Support.

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:

Red Hat Enterprise Linux HPC Node EUS (v. 6.5) - x86_64
Red Hat Enterprise Linux Server EUS (v. 6.5) - i386, 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 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 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:

Red Hat Enterprise Linux HPC Node EUS (v. 6.5):

Source:
qemu-kvm-0.12.1.2-2.415.el6_5.15.src.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-img-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.415.el6_5.15.x86_64.rpm

Red Hat Enterprise Linux Server EUS (v. 6.5):

Source:
qemu-kvm-0.12.1.2-2.415.el6_5.15.src.rpm

i386:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.i686.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.i686.rpm

x86_64:
qemu-guest-agent-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-img-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-debuginfo-0.12.1.2-2.415.el6_5.15.x86_64.rpm
qemu-kvm-tools-0.12.1.2-2.415.el6_5.15.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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