qemu - security update

Several vulnerabilities were discovered in qemu, a fast processor
emulator.

• CVE-2015-3214
  Matt Tait of Google’s Project Zero security team discovered a flaw
  in the QEMU i8254 PIT emulation. A privileged guest user in a guest
  with QEMU PIT emulation enabled could potentially use this flaw to
  execute arbitrary code on the host with the privileges of the
  hosting QEMU process.
• CVE-2015-5154
  Kevin Wolf of Red Hat discovered a heap buffer overflow flaw in the
  IDE subsystem in QEMU while processing certain ATAPI commands. A
  privileged guest user in a guest with the CDROM drive enabled could
  potentially use this flaw to execute arbitrary code on the host with
  the privileges of the hosting QEMU process.
• CVE-2015-5165
  Donghai Zhu discovered that the QEMU model of the RTL8139 network
  card did not sufficiently validate inputs in the C+ mode offload
  emulation, allowing a malicious guest to read uninitialized memory
  from the QEMU process’s heap.
• CVE-2015-5225
  Mr Qinghao Tang from QIHU 360 Inc. and Mr Zuozhi from Alibaba Inc
  discovered a buffer overflow flaw in the VNC display driver leading
  to heap memory corruption. A privileged guest user could use this
  flaw to mount a denial of service (QEMU process crash), or
  potentially to execute arbitrary code on the host with the
  privileges of the hosting QEMU process.
• CVE-2015-5745
  A buffer overflow vulnerability was discovered in the way QEMU
  handles the virtio-serial device. A malicious guest could use this
  flaw to mount a denial of service (QEMU process crash).

For the oldstable distribution (wheezy), these problems have been fixed
in version 1.1.2+dfsg-6a+deb7u9. The oldstable distribution is only
affected by CVE-2015-5165 and CVE-2015-5745.

For the stable distribution (jessie), these problems have been fixed in
version 1:2.1+dfsg-12+deb8u2.

For the unstable distribution (sid), these problems have been fixed in
version 1:2.4+dfsg-1a.

We recommend that you upgrade your qemu packages.