============================================================================
Ubuntu Security Notice USN-2439-1
December 11, 2014

qemu, qemu-kvm vulnerabilities
============================================================================

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

- Ubuntu 14.10
- Ubuntu 14.04 LTS
- Ubuntu 12.04 LTS
- Ubuntu 10.04 LTS

Summary:

Several security issues were fixed in QEMU.

Software Description:
- qemu: Machine emulator and virtualizer
- qemu-kvm: Machine emulator and virtualizer

Details:

Michael S. Tsirkin discovered that QEMU incorrectly handled certain
parameters during ram load while performing a migration. An attacker able
to manipulate savevm data could use this issue to possibly execute
arbitrary code on the host. This issue only affected Ubuntu 12.04 LTS,
Ubuntu 14.04 LTS, and Ubuntu 14.10. (CVE-2014-7840)

Paolo Bonzini discovered that QEMU incorrectly handled memory in the Cirrus
VGA device. A malicious guest could possibly use this issue to write into
memory of the host, leading to privilege escalation. (CVE-2014-8106)

Update instructions:

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

Ubuntu 14.10:
  qemu-system                     2.1+dfsg-4ubuntu6.3
  qemu-system-aarch64             2.1+dfsg-4ubuntu6.3
  qemu-system-arm                 2.1+dfsg-4ubuntu6.3
  qemu-system-mips                2.1+dfsg-4ubuntu6.3
  qemu-system-misc                2.1+dfsg-4ubuntu6.3
  qemu-system-ppc                 2.1+dfsg-4ubuntu6.3
  qemu-system-sparc               2.1+dfsg-4ubuntu6.3
  qemu-system-x86                 2.1+dfsg-4ubuntu6.3

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.9
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.9
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.9
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.9
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.9
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.9
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.9
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.9

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.21

Ubuntu 10.04 LTS:
  qemu-kvm                        0.12.3+noroms-0ubuntu9.26

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

References:
  https://www.ubuntu.com/usn/usn-2439-1
  CVE-2014-7840, CVE-2014-8106

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/2.1+dfsg-4ubuntu6.3
  https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.9
  https://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-0ubuntu14.21
  https://launchpad.net/ubuntu/+source/qemu-kvm/0.12.3+noroms-0ubuntu9.26