Book Image

ASP.NET Core 5 Secure Coding Cookbook

By : Roman Canlas
Book Image

ASP.NET Core 5 Secure Coding Cookbook

By: Roman Canlas

Overview of this book

ASP.NET Core developers are often presented with security test results showing the vulnerabilities found in their web apps. While the report may provide some high-level fix suggestions, it does not specify the exact steps that you need to take to resolve or fix weaknesses discovered by these tests. In ASP.NET Secure Coding Cookbook, you’ll start by learning the fundamental concepts of secure coding and then gradually progress to identifying common web app vulnerabilities in code. As you progress, you’ll cover recipes for fixing security misconfigurations in ASP.NET Core web apps. The book further demonstrates how you can resolve different types of Cross-Site Scripting. A dedicated section also takes you through fixing miscellaneous vulnerabilities that are no longer in the OWASP Top 10 list. This book features a recipe-style format, with each recipe containing sample unsecure code that presents the problem and corresponding solutions to eliminate the security bug. You’ll be able to follow along with each step of the exercise and use the accompanying sample ASP.NET Core solution to practice writing secure code. By the end of this book, you’ll be able to identify unsecure code causing different security flaws in ASP.NET Core web apps and you’ll have gained hands-on experience in removing vulnerabilities and security defects from your code.
Table of Contents (15 chapters)

Chapter 8: Cross-Site Scripting

Cross-site scripting is still one of the widespread vulnerabilities in web applications today. Also known as XSS, it is a security flaw that allows an attacker to insert malicious client-side code into an ASP.NET Core web page. The injected input is made possible because of the lack of sanitization and filtering, and the browser processes the unwanted arbitrary code.

An unknowing user can view a vulnerable web page in an XSS attack where the malicious script runs in the browser. Once the code executes, the attacker can potentially redirect the user to a rogue website, potentially steal its session cookies, or deface your ASP.NET Core web application.

In this chapter, we're going to cover the following recipes:

  • Fixing reflected XSS
  • Fixing stored/persistent XSS
  • Fixing DOM XSS

By the end of this chapter, you will learn how to protect your ASP.NET Core web application from the different types of XSS by properly encoding...