Scientific Linux Security Update : qemu-kvm on SL6.x i386/x86_64

This script is Copyright (C) 2014 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

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)

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.

- 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.

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.

See also :

http://www.nessus.org/u?1ea845d1

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.5
(CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 74490 ()

Bugtraq ID:

CVE ID: 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-2014-2894
CVE-2014-3461