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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

Fixing XXE injection with XmlTextReader

Similar to XmlDocument, another fast, non-cached, forward-only parser to XML option is XmlTextReader. A major drawback of this high-performance parser is its lack of data validation. XmlTextReader also allows you to process DTDs by default, which can be a concern if your XML sources are untrusted.

This recipe will show you how to disable DTD processing with XmlTextReader.

Getting ready

Using Visual Studio Code, open the sample Online Banking app folder at \Chapter05\xxe-injection02\before\OnlineBankingApp\.

How to do it…

Let's take a look at the steps for this recipe:

  1. From the starting exercise folder, launch Visual Studio Code by typing the following command:
    code .
  2. Open the Services\KnowledgebaseService.cs file. This version of the OnlineBankingApp sample solution is using XmlTextReader to parse the Knowledgebase.xml file:
    XmlTextReader xmlReader = new XmlTextReader(file);
    xmlReader.DtdProcessing = DtdProcessing...
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