Book Image

Kali Linux Web Penetration Testing Cookbook

By : Gilberto Najera-Gutierrez
Book Image

Kali Linux Web Penetration Testing Cookbook

By: Gilberto Najera-Gutierrez

Overview of this book

Web applications are a huge point of attack for malicious hackers and a critical area for security professionals and penetration testers to lock down and secure. Kali Linux is a Linux-based penetration testing platform and operating system that provides a huge array of testing tools, many of which can be used specifically to execute web penetration testing. This book will teach you, in the form step-by-step recipes, how to detect a wide array of vulnerabilities, exploit them to analyze their consequences, and ultimately buffer attackable surfaces so applications are more secure, for you and your users. Starting from the setup of a testing laboratory, this book will give you the skills you need to cover every stage of a penetration test: from gathering information about the system and the application to identifying vulnerabilities through manual testing and the use of vulnerability scanners to both basic and advanced exploitation techniques that may lead to a full system compromise. Finally, we will put this into the context of OWASP and the top 10 web application vulnerabilities you are most likely to encounter, equipping you with the ability to combat them effectively. By the end of the book, you will have the required skills to identify, exploit, and prevent web application vulnerabilities.
Table of Contents (17 chapters)
Kali Linux Web Penetration Testing Cookbook
Credits
About the Author
About the Reviewers
www.PacktPub.com
Preface
Index

Modifying data between the server and the client


When performing a MITM attack, we are able not only to listen to everything being sent between the victim systems but also to modify requests and responses and, thus, make them behave as we want.

In this recipe, we will use Ettercap filters to detect whether or not a packet contains the information we are interested in and to trigger the change operations.

Getting ready

We need to have MITM working before starting this recipe.

How to do it...

  1. Our first step is to create a filter file. Save the following code in a text file (we will call it regex-replace-filter.filter) as is shown here:

    # If the packet goes to vulnerable_vm on TCP port 80 (HTTP)
    if (ip.dst == '192.168.56.102'&& tcp.dst == 80) {
        # if the packet's data contains a login page
        if (search(DATA.data, "POST")){
            msg("POST request");
            if (search(DATA.data, "login.php") ){
                msg("Call to login page");
                # Will change content's length to prevent...