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Kali Linux Web Penetration Testing Cookbook

You're reading from   Kali Linux Web Penetration Testing Cookbook Over 80 recipes on how to identify, exploit, and test web application security with Kali Linux 2

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Product type Paperback
Published in Feb 2016
Publisher
ISBN-13 9781784392918
Length 296 pages
Edition 1st Edition
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Author (1):
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Gilberto Najera-Gutierrez Gilberto Najera-Gutierrez
Author Profile Icon Gilberto Najera-Gutierrez
Gilberto Najera-Gutierrez
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Toc

Table of Contents (12) Chapters Close

Preface 1. Setting Up Kali Linux FREE CHAPTER 2. Reconnaissance 3. Crawlers and Spiders 4. Finding Vulnerabilities 5. Automated Scanners 6. Exploitation – Low Hanging Fruits 7. Advanced Exploitation 8. Man in the Middle Attacks 9. Client-Side Attacks and Social Engineering 10. Mitigation of OWASP Top 10 Index

A3 – Preventing cross-site scripting


Cross-site scripting, as seen previously, happens when the data shown to the user is not correctly encoded and the browser interprets it as a script code and executes it. This also has an input validation factor, as a malicious code is usually inserted through input variables.

In this recipe, we will cover the input validation and output encoding required for developers to prevent XSS vulnerabilities in their applications.

How to do it...

  1. The first sign of an application being vulnerable to XSS is that in the page it reflects the exact input given by the user. So, try not to use user-given information to build output text.

  2. When you need to put user-provided data in the output page, validate such data to prevent the insertion of any type of code. We already saw how to do that in the A1 – Preventing injection attacks recipe.

  3. If, for some reason, the user is allowed to input special characters or code fragments, sanitize or properly encode the text before inserting...

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