bugtraq - XSS vulnerability in WebPress

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Message-Id: <201007151422.o6FEMBBK067109@htbridge.ch>
Date: Thu, 15 Jul 2010 16:22:11 +0200 (CEST)
From: advisory@...ridge.ch
To: bugtraq@...urityfocus.com
Subject: XSS vulnerability in WebPress

Vulnerability ID: HTB22481
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_webpress_3.html
Product: WebPress
Vendor: YWP ( http://www.goywp.com/ ) 
Vulnerable Version: Current at 01.07.2010 and Probably Prior Versions
Vendor Notification: 01 July 2010 
Vulnerability Type: XSS (Cross Site Scripting)
Status: Not Fixed, Vendor Alerted, Awaiting Vendor Response
Risk level: Medium 
Credit: High-Tech Bridge SA - Ethical Hacking & Penetration Testing (http://www.htbridge.ch/) 

Vulnerability Details:
User can execute arbitrary JavaScript code within the vulnerable application.

The vulnerability exists due to failure in the "admin_page_accounts_users_action.php" script to properly sanitize user-supplied input in "id_num_mod" variable. 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.

An attacker can use browser to exploit this vulnerability. The following PoC is available:

http://host/path/_system/accounts/users/_pages/admin_page_accounts_users_action.php?id_num_mod=xxx%3Cscript%3Ealert%28document.cookie%29%3C/script%3E&submit_action=Edit