This Metasploit module performs a Denial of Service Attack against the ISC DHCP server, versions 4.1 before 4.1.1-P1 and 4.0 before 4.0.2-P1. It sends out a DHCP Request message with a 0-length client_id option for an IP address on the appropriate range for the dhcp server. When ISC DHCP Server tries to hash this value it exits abnormally.
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ISC DHCPd denial of service proof of concept exploit.
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