============================================================================
Ubuntu Security Notice USN-2745-1
September 24, 2015

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

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

- Ubuntu 15.04
- Ubuntu 14.04 LTS
- 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:

Lian Yihan discovered that QEMU incorrectly handled certain payload
messages in the VNC display driver. A malicious guest could use this issue
to cause the QEMU process to hang, resulting in a denial of service. This
issue only affected Ubuntu 12.04 LTS and Ubuntu 14.04 LTS. (CVE-2015-5239)

Qinghao Tang discovered that QEMU incorrectly handled receiving certain
packets in the NE2000 network driver. A malicious guest could use this
issue to cause the QEMU process to hang, resulting in a denial of service.
(CVE-2015-5278)

Qinghao Tang discovered that QEMU incorrectly handled receiving certain
packets in the NE2000 network driver. A malicious guest could use this
issue to cause a denial of service, or possibly execute arbitrary code on
the host as the user running the QEMU process. In the default installation,
when QEMU is used with libvirt, attackers would be isolated by the libvirt
AppArmor profile. (CVE-2015-5279)

Qinghao Tang discovered that QEMU incorrectly handled transmit descriptor
data when sending network packets. A malicious guest could use this issue
to cause the QEMU process to hang, resulting in a denial of service.
(CVE-2015-6815)

Qinghao Tang discovered that QEMU incorrectly handled ATAPI command
permissions. A malicious guest could use this issue to cause the QEMU
process to crash, resulting in a denial of service. (CVE-2015-6855)

Update instructions:

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

Ubuntu 15.04:
  qemu-system                     1:2.2+dfsg-5expubuntu9.5
  qemu-system-aarch64             1:2.2+dfsg-5expubuntu9.5
  qemu-system-arm                 1:2.2+dfsg-5expubuntu9.5
  qemu-system-mips                1:2.2+dfsg-5expubuntu9.5
  qemu-system-misc                1:2.2+dfsg-5expubuntu9.5
  qemu-system-ppc                 1:2.2+dfsg-5expubuntu9.5
  qemu-system-sparc               1:2.2+dfsg-5expubuntu9.5
  qemu-system-x86                 1:2.2+dfsg-5expubuntu9.5

Ubuntu 14.04 LTS:
  qemu-system                     2.0.0+dfsg-2ubuntu1.19
  qemu-system-aarch64             2.0.0+dfsg-2ubuntu1.19
  qemu-system-arm                 2.0.0+dfsg-2ubuntu1.19
  qemu-system-mips                2.0.0+dfsg-2ubuntu1.19
  qemu-system-misc                2.0.0+dfsg-2ubuntu1.19
  qemu-system-ppc                 2.0.0+dfsg-2ubuntu1.19
  qemu-system-sparc               2.0.0+dfsg-2ubuntu1.19
  qemu-system-x86                 2.0.0+dfsg-2ubuntu1.19

Ubuntu 12.04 LTS:
  qemu-kvm                        1.0+noroms-0ubuntu14.25

After a standard system update you need to restart all QEMU virtual
machines to make all the necessary changes.

References:
  http://www.ubuntu.com/usn/usn-2745-1
  CVE-2015-5239, CVE-2015-5278, CVE-2015-5279, CVE-2015-6815,
  CVE-2015-6855

Package Information:
  https://launchpad.net/ubuntu/+source/qemu/1:2.2+dfsg-5expubuntu9.5
  https://launchpad.net/ubuntu/+source/qemu/2.0.0+dfsg-2ubuntu1.19
  https://launchpad.net/ubuntu/+source/qemu-kvm/1.0+noroms-0ubuntu14.25