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 weak protocols

The cryptographic protocol known as TLS has evolved over the years and initially started as Secure Sockets Layer, most commonly known as SSL. This is now deprecated, and so its successors have been discovered to have vulnerabilities in their design. The latest version of the Transport Layer Security protocol, TLS 1.3, was created to solve these problems.

Enabling HTTPS and using TLS is not enough to protect your ASP.NET Core web applications from accidental data exposure. An adversary can potentially exploit a weak version of TLS. To overcome this, you must employ the latest and greatest versions of cryptographic ciphers and protocols.

This recipe will teach you how to change an outdated version of TLS and write code to utilize the TLS 1.3 version of the protocol.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder at \Chapter02\weak-protocol\before\OnlineBankingApp\.

You can perform the steps in this folder to fix...