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网页打开是一个前端猫猫。

根据文字描述应该是有一个。备份文件。

进行一下目录扫描。

找到对应的 www.zip文件

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查看 flag.php 文件

有个假的flag。

查看其他的文件。

class.php

<?php
include 'flag.php';

error_reporting(0);

class Name{
    private $username = 'nonono';
    private $password = 'yesyes';

    public function __construct($username,$password){
        $this->username = $username;
        $this->password = $password;
    }

    function __wakeup(){
        $this->username = 'guest';
    }

    function __destruct(){
        if ($this->password != 100) {
            echo "</br>NO!!!hacker!!!</br>";
            echo "You name is: ";
            echo $this->username;echo "</br>";
            echo "You password is: ";
            echo $this->password;echo "</br>";
            die();
        }
        if ($this->username === 'admin') {
            global $flag;
            echo $flag;
        }else{
            echo "</br>hello my friend~~</br>sorry i can't give you the flag!";
            die();

            
        }
    }
}
?>

index.php

<!DOCTYPE html>
<head>
  <meta charset="UTF-8">
  <title>I have a cat!</title>
  <link rel="stylesheet" href="<https://cdnjs.cloudflare.com/ajax/libs/meyer-reset/2.0/reset.min.css>">
      <link rel="stylesheet" href="style.css">
</head>
<style>
    #login{   
        position: absolute;   
        top: 50%;   
        left:50%;   
        margin: -150px 0 0 -150px;   
        width: 300px;   
        height: 300px;   
    }   
    h4{   
        font-size: 2em;   
        margin: 0.67em 0;   
    }
</style>
<body>

<div id="world">
    <div style="text-shadow:0px 0px 5px;font-family:arial;color:black;font-size:20px;position: absolute;bottom: 85%;left: 440px;font-family:KaiTi;">因为每次猫猫都在我键盘上乱跳，所以我有一个良好的备份网站的习惯
    </div>
    <div style="text-shadow:0px 0px 5px;font-family:arial;color:black;font-size:20px;position: absolute;bottom: 80%;left: 700px;font-family:KaiTi;">不愧是我！！！
    </div>
    <div style="text-shadow:0px 0px 5px;font-family:arial;color:black;font-size:20px;position: absolute;bottom: 70%;left: 640px;font-family:KaiTi;">
    <?php
    include 'class.php';
    $select = $_GET['select'];
    $res=unserialize(@$select);
    ?>
    </div>
    <div style="position: absolute;bottom: 5%;width: 99%;"><p align="center" style="font:italic 15px Georgia,serif;color:white;"> Syclover @ cl4y</p></div>
</div>
<script src='<http://cdnjs.cloudflare.com/ajax/libs/three.js/r70/three.min.js>'></script>
<script src='<http://cdnjs.cloudflare.com/ajax/libs/gsap/1.16.1/TweenMax.min.js>'></script>
<script src='<https://s3-us-west-2.amazonaws.com/s.cdpn.io/264161/OrbitControls.js>'></script>
<script src='<https://s3-us-west-2.amazonaws.com/s.cdpn.io/264161/Cat.js>'></script>
<script  src="index.js"></script>
</body>
</html>

发现应该是一个 php 发序列漏洞

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根据 class.php 知道

只有生成的对象 password == 100，username == admin 才能实现调用。

这里需要我们去生产一个 php 对象并且序列

然后通过 index.php的传入方式实现反序列化漏洞。