bugtraq - HTB22867: XSS in PhotoSmash wordpress plugin

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Message-Id: <201103080955.p289t5GT093031@htbridge.ch>
Date: Tue, 8 Mar 2011 10:55:05 +0100 (CET)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: HTB22867: XSS in PhotoSmash wordpress plugin

Vulnerability ID: HTB22867
Reference: http://www.htbridge.ch/advisory/xss_in_photosmash_wordpress_plugin.html
Product: PhotoSmash wordpress plugin
Vendor: Byron Bennett ( http://smashly.net/ ) 
Vulnerable Version: 1.0.1 
Vendor Notification: 22 February 2011 
Vulnerability Type: XSS (Cross Site Scripting)
Status: Fixed by Vendor
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
The vulnerability exists due to failure in the "/wp-content/plugins/photosmash-galleries/index.php" script to properly sanitize user-supplied input in "action" variable.
User can execute arbitrary JavaScript code within the vulnerable application.
Successful exploitation of this vulnerability could result in a compromise of the application, theft of cookie-based authentication credentials, disclosure or modification of sensitive data.

The following PoC is available:

http://[host]/wp-content/plugins/photosmash-galleries/index.php?action=%3Cscript%3Ealert%28%22XSS%22%29;%3C/script%3E

Solution: Upgrade to the most recent version