Gastebuch Cross-Site Scripting Vulnerability

Bugtraq ID:	16615
Class:	Input Validation Error
CVE:
Remote:	Yes
Local:	No
Published:	Feb 13 2006 12:00AM
Updated:	Feb 14 2006 04:53PM
Credit:	Discovered by Micha Borrmann <[email protected]>.
Vulnerable:	PHP4Scripte.de Gastebuch 1.3.2
Not Vulnerable:	PHP4Scripte.de Gastebuch 1.3.3

Gastebuch Cross-Site Scripting Vulnerability

Gastebuch is prone to a cross-site scripting vulnerability. This issue is due to a failure in the application to properly sanitize user-supplied input before including it in dynamically generated HTML content.

An attacker may leverage this issue to have arbitrary script code executed in the browser of an unsuspecting user in the context of the affected site. This may facilitate the theft of cookie-based authentication credentials as well as other attacks.

Gastebuch version 1.3.2 is vulnerable to this issue; prior versions may also be affected.

Gastebuch Cross-Site Scripting Vulnerability

An exploit is not required.

The following proof of concept was provided:

http://www.example.com/"<script>alert(123)</script>"

Gastebuch Cross-Site Scripting Vulnerability

Solution:
The vendor has released version 1.3.3 to address this issue.


PHP4Scripte.de Gastebuch 1.3.2

• PHP4Scripte.de Gastebuch Latest Version Download Page
  http://www.php4scripte.de/gast.php

Gastebuch Cross-Site Scripting Vulnerability

References:

• Gastebuch Product Page (PHP4Scripte.de)
  
• PHP4Scripte.de Home Page (PHP4Scripte.de)
  
• XSS vulnerability in guestbook-php-script (Micha Borrmann )