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Test ID:1.3.6.1.4.1.25623.1.0.871177
Category:Red Hat Local Security Checks
Title:RedHat Update for qemu-kvm RHSA-2014:0743-01
Summary:The remote host is missing an update for the 'qemu-kvm'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'qemu-kvm'
package(s) announced via the referenced advisory.

Vulnerability Insight:
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.

Multiple buffer overflow, input validation, and out-of-bounds write flaws
were found in the way the virtio, virtio-net, virtio-scsi, and usb drivers
of QEMU handled state loading after migration. A user able to alter the
savevm data (either on the disk or over the wire during migration) could
use either of these flaws to corrupt QEMU process memory on the
(destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process.
(CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536, CVE-2013-4541,
CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, CVE-2014-3461)

An out-of-bounds memory access flaw was found in the way QEMU's IDE device
driver handled the execution of SMART EXECUTE OFFLINE commands.
A privileged guest user could use this flaw to corrupt QEMU process memory
on the host, which could potentially result in arbitrary code execution on
the host with the privileges of the QEMU process. (CVE-2014-2894)

The CVE-2013-4148, CVE-2013-4151, CVE-2013-4535, CVE-2013-4536,
CVE-2013-4541, CVE-2013-4542, CVE-2013-6399, CVE-2014-0182, and
CVE-2014-3461 issues were discovered by Michael S. Tsirkin of Red Hat,
Anthony Liguori, and Michael Roth.

This update also fixes the following bugs:

* Previously, under certain circumstances, libvirt failed to start guests
which used a non-zero PCI domain and SR-IOV Virtual Functions (VFs), and
returned the following error message:

Can't assign device inside non-zero PCI segment as this KVM module doesn't
support it.

This update fixes this issue and guests using the aforementioned
configuration no longer fail to start. (BZ#1099941)

* Due to an incorrect initialization of the cpus_sts bitmap, which holds
the enablement status of a vCPU, libvirt could fail to start a guest with
an unusual vCPU topology (for example, a guest with three cores and two
sockets). With this update, the initialization of cpus_sts has been
corrected, and libvirt no longer fails to start the aforementioned guests.
(BZ#1100575)

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.

Affected Software/OS:
qemu-kvm on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
7.5

CVSS Vector:
AV:N/AC:L/Au:N/C:P/I:P/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2013-4148
http://lists.fedoraproject.org/pipermail/package-announce/2014-May/133345.html
http://lists.nongnu.org/archive/html/qemu-stable/2014-07/msg00187.html
RedHat Security Advisories: RHSA-2014:0743
http://rhn.redhat.com/errata/RHSA-2014-0743.html
RedHat Security Advisories: RHSA-2014:0744
http://rhn.redhat.com/errata/RHSA-2014-0744.html
Common Vulnerability Exposure (CVE) ID: CVE-2013-4151
Common Vulnerability Exposure (CVE) ID: CVE-2013-4535
http://git.qemu.org/?p=qemu.git;a=commitdiff;h=36cf2a37132c7f01fa9adb5f95f5312b27742fd4
https://bugzilla.redhat.com/show_bug.cgi?id=1066401
Common Vulnerability Exposure (CVE) ID: CVE-2013-4536
Common Vulnerability Exposure (CVE) ID: CVE-2013-4541
Common Vulnerability Exposure (CVE) ID: CVE-2013-4542
Common Vulnerability Exposure (CVE) ID: CVE-2013-6399
Common Vulnerability Exposure (CVE) ID: CVE-2014-0182
Common Vulnerability Exposure (CVE) ID: CVE-2014-2894
BugTraq ID: 66932
http://www.securityfocus.com/bid/66932
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02016.html
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02095.html
https://lists.nongnu.org/archive/html/qemu-devel/2014-04/msg02152.html
http://www.openwall.com/lists/oss-security/2014/04/15/4
http://www.openwall.com/lists/oss-security/2014/04/18/5
RedHat Security Advisories: RHSA-2014:0704
http://rhn.redhat.com/errata/RHSA-2014-0704.html
http://secunia.com/advisories/57945
http://secunia.com/advisories/58191
http://www.ubuntu.com/usn/USN-2182-1
Common Vulnerability Exposure (CVE) ID: CVE-2014-3461
http://lists.fedoraproject.org/pipermail/package-announce/2014-June/134053.html
http://article.gmane.org/gmane.comp.emulators.qemu/272092
CopyrightCopyright (C) 2014 Greenbone Networks GmbH

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