@@ -345,8 +345,15 @@ function save_dns_record($id, $record)

       if (! $record['data']) {

           system_failure('SRV target missing');

       }

-      list($hostname, $port) = explode(':', $record['data'], 2);

+      $data = explode(':', $record['data'], 2);

+      if (count($data) != 2) {

+          system_failure('Das eingegebene Ziel war nicht im Format hostname:port');

+      }

+      list($hostname, $port) = $data;

       verify_input_hostname($hostname);

+      if ($port != (int) $port || $port == 0) {

+          system_failure('Ungültige Portnummer');

+      }

       $record['ip'] = null;

       break;

     default: