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 the incorrect restrictions of excessive authentication attempts

An adversary will always try to gain access to the system and beat its authentication mechanism. The most prevalent way of doing this is by using compromised credentials, collected from illicit sources, or as simple as having a list of common passwords, which can be found on the web. These attacks can be executed with automation using a crafted script or a tool.

An ASP.NET Core web application must withstand this exploitation by implementing defensive measures. This helps with rejecting excessive authentication attempts and writing secure code.

In this recipe, we will identify the root cause of vulnerabilities in code and mitigate the issue by enabling the lockout feature.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder at \Chapter03\improper-auth\before\OnlineBankingApp.

Testing the restriction of excessive authentication attempts

Follow these steps:

  1. Navigate...