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Ubuntu Security Notice USN-2092-1
January 30, 2014

qemu, qemu-kvm vulnerabilities

A security issue affects these releases of Ubuntu and its derivatives:

• Ubuntu 13.10
• Ubuntu 12.10
• Ubuntu 12.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:

• qemu: Machine emulator and virtualizer
• qemu-kvm: Machine emulator and virtualizer

Details:

Asias He discovered that QEMU incorrectly handled SCSI controllers with
more than 256 attached devices. A local user could possibly use this flaw
to elevate privileges. (CVE-2013-4344)

It was discovered that QEMU incorrectly handled Xen disks. A local guest
could possibly use this flaw to consume resources, resulting in a denial of
service. This issue only affected Ubuntu 12.10 and Ubuntu 13.10.
(CVE-2013-4375)

Sibiao Luo discovered that QEMU incorrectly handled device hot-unplugging.
A local user could possibly use this flaw to cause a denial of service.
This issue only affected Ubuntu 13.10. (CVE-2013-4377)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 13.10:
qemu-system 1.5.0+dfsg-3ubuntu5.3
qemu-system-arm 1.5.0+dfsg-3ubuntu5.3
qemu-system-mips 1.5.0+dfsg-3ubuntu5.3
qemu-system-misc 1.5.0+dfsg-3ubuntu5.3
qemu-system-ppc 1.5.0+dfsg-3ubuntu5.3
qemu-system-sparc 1.5.0+dfsg-3ubuntu5.3
qemu-system-x86 1.5.0+dfsg-3ubuntu5.3

Ubuntu 12.10:
qemu-kvm 1.2.0+noroms-0ubuntu2.12.10.6

Ubuntu 12.04 LTS:
qemu-kvm 1.0+noroms-0ubuntu14.13

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
http://www.ubuntu.com/usn/usn-2092-1
CVE-2013-4344, CVE-2013-4375, CVE-2013-4377

Package Information:
https://launchpad.net/ubuntu/+source/qemu/1.5.0+dfsg-3ubuntu5.3
https://launchpad.net/ubuntu/+source/qemu-kvm/1.2.0+noroms-0ubuntu2.12.10.6
https://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-0ubuntu14.13

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