MySource Matrix 3.28.3 (height) Remote Reflected XSS Vulnerability

Risk: Low
Local: No
Remote: Yes

CVSS Base Score: 4.3/10
Impact Subscore: 2.9/10
Exploitability Subscore: 8.6/10
Exploit range: Remote
Attack complexity: Medium
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

Title: MySource Matrix 3.28.3 (height) Remote Reflected XSS Vulnerability Vendor: Squiz Pty Ltd. - 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 Zero Science Lab Advisory ID: ZSL-2010-4962 Advisory URL: PoC:


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