isc-dhcp - security update

It was discovered that a maliciously crafted packet can crash any of
the isc-dhcp applications. This includes the DHCP client, relay, and
server application. Only IPv4 setups are affected.

For the oldstable distribution (wheezy), this problem has been fixed
in version 4.2.2.dfsg.1-5+deb70u8.

For the stable distribution (jessie), this problem has been fixed in
version 4.3.1-6+deb8u2.

For the testing (stretch) and unstable (sid) distributions, this
problem will be fixed soon.

We recommend that you upgrade your isc-dhcp packages.