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. For the old stable distribution , these problems have been fixed in version 3.0.4-13+etch2. For the stable distribution , this problem has been fixed in version 3.1.1-6+lenny2. For the unstable distribution , these problems will be fixed soon. We recommend that you upgrade your dhcp3 packages.