MySource Matrix 3.28.3 (height) Remote Reflected XSS Vulnerability

Title:

MySource Matrix 3.28.3 (height) Remote Reflected XSS Vulnerability




Vendor:

Squiz Pty Ltd. - http://www.squiz.net
http://www.matrix.squiz.net/

Summary:

MySource Matrix is a powerful Open Source Content Management System
(CMS) written in PHP and is suitable for many types of organisations.


Description:

Input passed via the "height" parameter to char_map.php is not properly
sanitised before being returned to the user. This can be exploited to execute
arbitrary HTML and script code in a user's browser session in context of an
affected site.


Tested on:

MS WinXP Pro SP3 (EN)
PHP 5.3.0
MySQL 5.1.36
Apache 2.2.11 (Win32)


Version affected:

3.28.3


Vulnerable lines:

182: // <?php echo $_REQUEST['width'];?>;
183: // <?php echo $_REQUEST['height'];?>;


Solution:

Existing users can remove the two commented out lines from:
/path/to/matrix/fudge/wysiwyg/plugins/special_chars/char_map.php (lines 182 and 183)


Vendor status:

[05.09.2010] Vulnerability discovered.
[06.09.2010] Vendor contacted.
[06.09.2010] Vendor replied asking details.
[06.09.2010] Sent analysis report to vendor.
[06.09.2010] Vendor verifies vulnerability.
[06.09.2010] Vendor releases fix versions 3.26.8 and 3.28.4.
[06.09.2010] Public advisory released.


Vulnerability discovered by:

Gjoko 'LiquidWorm' Krstic
liquidworm gmail com
http://www.zeroscience.mk


Zero Science Lab Advisory ID:

ZSL-2010-4962


Advisory URL:

http://www.zeroscience.mk/en/vulnerabilities/ZSL-2010-4962.php



PoC:

http://200.200.200.200/fudge/wysiwyg/plugins/special_chars/char_map.php?width=233%3C/script%3E&height=233%3Cscript%3Ealert%28%27zsl%27%29%3C%2fscript%3E