Reflected XSS at dailydeals.mtn.co.za

How it was found

Hello MTN Group:

I found reflected XSS vi category_id= parameter .

The server reads data directly from the HTTP request and reflects it back in the HTTP response. Reflected XSS exploits occur when an attacker causes a victim to supply dangerous content to a vulnerable web application, which is then reflected back to the victim and executed by the web browser. The most common mechanism for delivering malicious content is to include it as a parameter in a URL that is posted publicly or e-mailed directly to the victim. URLs constructed in this manner constitute the core of many phishing schemes, whereby an attacker convinces a victim to visit a URL that refers to a vulnerable site. After the site reflects the attacker's content back to the victim, the content is executed by the victim's browser.

Steps To Reproduce:

1. visite the https://dailydeals.mtn.co.za
2. click on Categories, Then click on any items on it, now you get the category_id parameter on the URL.
3. add this payload 3mh8r%3cimg%20src%3da%20onerror%3dalert(1)%3e as a value to category_id parameter you will get popup with vaule 1 as the POC image {F1317658}

one link POC:

https://dailydeals.mtn.co.za/index.cfm?GO=DEALS&category_id=3mh8r%3Cimg%20src%3da%20onerror%3dalert(1)%3E

Recommendation:

Your script should filter metacharacters from user input.

Impact

attacker convinces a victim to visit a URL & steal users cookies