Book Image

Web Penetration Testing with Kali Linux - Third Edition

By : Gilberto Najera-Gutierrez, Juned Ahmed Ansari
Book Image

Web Penetration Testing with Kali Linux - Third Edition

By: Gilberto Najera-Gutierrez, Juned Ahmed Ansari

Overview of this book

Web Penetration Testing with Kali Linux - Third Edition shows you how to set up a lab, helps you understand the nature and mechanics of attacking websites, and explains classical attacks in great depth. This edition is heavily updated for the latest Kali Linux changes and the most recent attacks. Kali Linux shines when it comes to client-side attacks and fuzzing in particular. From the start of the book, you'll be given a thorough grounding in the concepts of hacking and penetration testing, and you'll see the tools used in Kali Linux that relate to web application hacking. You'll gain a deep understanding of classicalSQL, command-injection flaws, and the many ways to exploit these flaws. Web penetration testing also needs a general overview of client-side attacks, which is rounded out by a long discussion of scripting and input validation flaws. There is also an important chapter on cryptographic implementation flaws, where we discuss the most recent problems with cryptographic layers in the networking stack. The importance of these attacks cannot be overstated, and defending against them is relevant to most internet users and, of course, penetration testers. At the end of the book, you'll use an automated technique called fuzzing to identify flaws in a web application. Finally, you'll gain an understanding of web application vulnerabilities and the ways they can be exploited using the tools in Kali Linux.
Table of Contents (19 chapters)
Title Page
Copyright and Credits
Packt Upsell

XML injection

This section will cover two different perspectives on the use of XML in web applications:

  • When the application performs searches in an XML file or XML database
  • When the user submits XML formatted information to be parsed by the application


XPath injection

XPath is a query language for selecting nodes from an XML document. The following is the basic XML structure:


An XPath search for element can be represented as follows:


More complex expressions can be made, for example, an XPath query for a login page may look like the following:

//Employee[UserName/text()='myuser' And Password/text()='mypassword'] 

As with SQL, if the input from the user is taken as is and concatenated to a query string, such input may be interpreted as code instead of data parameters.

For example, let's look at bWapp's XML/XPath Injection (Search) exercise. It shows a drop box, where you...