How to implement Reflect XSS fix in webforms .net 2.0 Application

Question

I have started working on a webforms application built in .net 2.0 using VS 2005. I am kind of new to web application

When I am clicking on a Menu item which is <li/> tag and capture the request in burp and Changed the Url to "obgv0%22%3e%3cscript%3ealert('XSS HACKED')%3c%2fscript%3et48bw"

Here I am getting getting a pop-up-"XSS HACKED" and it indicates that it is vulnerable.

I tried to find exact solution of this problem on net. but unlucky so far.

1. So please help me in solving it

I tried to replicate the scenario in VS 2015 by creating an empty web application. but it seems Microsoft put a permanent fix for this. If someone can guide me the way Microsoft implemented it and help me in understanding the same. that will be great.

damaged URL "obgv0%22%3e%3cscript%3ealert('XSS HACKED')%3c%2fscript%3et48bw"

1. Need help in solving the problem in .net 2.0 application
2. Need support in understanding the way Microsoft implemented the fix for newer versions of .net

Answer 1

We have removed the cookies from the page and implement the server side validation to solve the vulnerability.

This is not a suggested solution for all the XSS issues. Solutions is Vulnerability Specific.