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 :

Two integer overflow flaws were found in the QEMU block driver for
QCOW version 1 disk images. A user able to alter the QEMU disk image
files loaded by a guest could use either of these flaws 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-2014-0222, CVE-2014-0223)

This update also fixes the following bugs :

- In certain scenarios, when performing live incremental
migration, the disk size could be expanded considerably
due to the transfer of unallocated sectors past the end
of the base image. With this update, the
bdrv_is_allocated() function has been fixed to no longer
return 'True' for unallocated sectors, and the disk size
no longer changes after performing live incremental
migration.

- This update enables ioeventfd in virtio-scsi-pci. This
allows QEMU to process I/O requests outside of the vCPU
thread, reducing the latency of submitting requests and
improving single task throughput.

- Prior to this update, vendor-specific SCSI commands
issued from a KVM guest did not reach the target device
due to QEMU considering such commands as invalid. This
update fixes this bug by properly propagating
vendor-specific SCSI commands to the target device.

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?b3c73f88

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: 77272 ()

Bugtraq ID:

CVE ID: CVE-2014-0222
CVE-2014-0223

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