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ASP.NET Core 5 Secure Coding Cookbook

You're reading from   ASP.NET Core 5 Secure Coding Cookbook Practical recipes for tackling vulnerabilities in your ASP.NET web applications

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Product type Paperback
Published in Jul 2021
Publisher Packt
ISBN-13 9781801071567
Length 324 pages
Edition 1st Edition
Languages
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Author (1):
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Roman Canlas Roman Canlas
Author Profile Icon Roman Canlas
Roman Canlas
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Toc

Table of Contents (15) Chapters Close

Preface 1. Chapter 1: Secure Coding Fundamentals 2. Chapter 2: Injection Flaws FREE CHAPTER 3. Chapter 3: Broken Authentication 4. Chapter 4: Sensitive Data Exposure 5. Chapter 5: XML External Entities 6. Chapter 6: Broken Access Control 7. Chapter 7: Security Misconfiguration 8. Chapter 8: Cross-Site Scripting 9. Chapter 9: Insecure Deserialization 10. Chapter 10: Using Components with Known Vulnerabilities 11. Chapter 11: Insufficient Logging and Monitoring 12. Chapter 12: Miscellaneous Vulnerabilities 13. Chapter 13: Best Practices 14. Other Books You May Enjoy

Output encoding using HtmlEncoder

HTML encoding converts special characters so that the browser will interpret the text correctly and not render it as HTML. For instance, a string may contain a less than character <, and in HTML standards, this is an HTML entity being used to open and close tags. This needs to be escaped into &lt; to preserve the meaning of the text.

The protection that escaping output provides lies in preventing the attacker from changing the intent or the input's purpose when it is parsed by the interpreter. This stops the malicious actor from trying to execute scripts within the HTML context.

The following table displays the most common HTML entities and their encoded counterparts. This is by no means a complete list:

Table 1.1 – HTML entities

Table 1.1 – HTML entities

In this recipe, you will learn how to use HtmlEncoder to escape output in HTML.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder...

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