91 lines
2.3 KiB
Ruby
91 lines
2.3 KiB
Ruby
##
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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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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Capture
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def initialize
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super(
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'Name' => 'Rogue Gateway Detection: Receiver',
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'Description' => %q{
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This module listens for replies to the requests sent by
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the rogue_send module. The RPORT, CPORT, and ECHOID values
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must match the rogue_send parameters used exactly.
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},
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'Author' => 'hdm',
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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.metasploit.com/research/projects/rogue_network/'],
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]
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)
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register_options([
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OptPort.new("RPORT", [true, "The destination port for the TCP SYN packet", 80]),
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OptPort.new("CPORT", [true, "The source port for the TCP SYN packet", 13832]),
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OptInt.new("ECHOID", [true, "The unique ICMP ECHO ID to embed into the packet", 7893]),
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])
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deregister_options('RHOST')
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end
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def build_filter
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"(icmp and icmp[0] == 0) or (" +
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"tcp and (tcp[13] == 0x12 or (tcp[13] & 0x04) != 0) and " +
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"src port #{datastore['RPORT']} and dst port #{datastore['CPORT']} " +
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")"
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end
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def run
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open_pcap('SNAPLEN' => 128, 'FILTER' => build_filter)
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print_status("Opening the capture interface...")
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print_status("Waiting for responses to rogue_send...")
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begin
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each_packet do |pkt|
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r = parse_reply(pkt)
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next if not r
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print_status("Reply from #{r[:internal]} using gateway #{r[:external]} (#{r[:type].to_s.upcase})")
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end
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rescue ::Interrupt
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raise $!
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ensure
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close_pcap
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end
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end
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def parse_reply(r)
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p = PacketFu::Packet.parse(r)
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return unless p.is_eth?
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if p.is_icmp?
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return if(p.payload[0,2] != [datastore['ECHOID']].pack("n"))
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return unless p.payload.size >= 8
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reply = {:raw => p}
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reply[:type] = :icmp
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reply[:internal] = Rex::Socket.addr_nota(p.payload[4,4])
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reply[:external] = p.ip_saddr
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elsif p.is_tcp?
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return if p.tcp_ack.zero?
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reply = {:packet => p}
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reply[:type] = :tcp
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reply[:internal] = Rex::Socket.addr_itoa(p.tcp_ack - 1)
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reply[:external] = p.ip_saddr
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else
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reply = nil
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end
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return reply
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end
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end
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