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

Exploiting OS Command Injections


In the previous recipe, we have seen how PHP's system() can be used to execute OS commands in the server; sometimes developers use instructions similar to that or with the same functionality to perform some tasks and sometimes they use invalidated user inputs as parameters for the execution of commands.

In this recipe, we will exploit a Command Injection vulnerability and extract important information from the server.

How to do it...

  1. Log into the Damn Vulnerable Web Application (DVWA) and go to Command Execution.

  2. We will see a Ping for FREE form, let's try it. Ping to 192.168.56.1 (our Kali Linux machine's IP in the host-only network):

    That output looks like it was taken directly from the ping command's output. This suggests that the server is using an OS command to execute the ping, so it may be possible to inject OS commands.

  3. Let's try to inject a very simple command, submit the following: 192.168.56.1;uname -a.

    We can see the uname command's output just after...