Several remote vulnerabilities have been discovered in ISC's DHCP implementation: It was discovered that dhclient does not properly handle overlong subnet mask options, leading to a stack-based buffer overflow and possible arbitrary code execution. Christoph Biedl discovered that the DHCP server may terminate when receiving certain well-formed DHCP requests, provided that the server configuration mixes host definitions using "dhcp-client-identifier" and "hardware ethernet". This vulnerability only affects the lenny versions of dhcp3-server and dhcp3-server-ldap.