isc-dhcp -- Multiple vulnerabilities

ISC reports:

Failure to properly bounds check a buffer used for processing
DHCP options allows a malicious server (or an entity
masquerading as a server) to cause a buffer overflow (and
resulting crash) in dhclient by sending a response containing a
specially constructed options section.

A malicious client which is allowed to send very large amounts
of traffic (billions of packets) to a DHCP server can eventually
overflow a 32-bit reference counter, potentially causing dhcpd
to crash.