bind9 - security update

• CVE-2016-2848
  A server vulnerable to this defect can be forced to
  exit with an assertion failure if it receives a malformed packet.
  Authoritative and recursive servers are both vulnerable.

For Debian 7 Wheezy, these problems have been fixed in version
1:9.8.4.dfsg.P1-6+nmu2+deb7u12.

We recommend that you upgrade your bind9 packages.

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: <https://wiki.debian.org/LTS&gt;