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