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)

Fixing reflected XSS

Reflected cross-site scripting is one type of XSS where a bad actor could inject code as part of the HTTP response. The reflected XSS is non-persistent and not stored in the database, but the attack payload is delivered back to the browser, reflecting the untrusted input.

The reflected XSS vulnerability is possible when output is not encoded and exploited when tricked users click a malicious link containing the XSS payload. In this recipe, we will fix the reflected XSS vulnerability by using the built-in encoding features of the Razor page.

Getting ready

For the recipes in this chapter, we will need the sample Online Banking app.

Open the command shell and download the sample Online Banking app by cloning the ASP.NET Secure Coding Cookbook repository as follows:

git clone https://github.com/PacktPublishing/ASP.NET-Core-Secure-Coding-Cookbook.git

Run the sample app to verify that there are no build or compile errors. In your command shell, navigate...