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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

Executing commands with Shellshock


Shellshock (also called Bashdoor) is a bug that was discovered in the Bash shell in September 2014, allowing the execution of commands through functions stored in the values of environment variables.

Shellshock is relevant to us as web penetration testers because developers sometimes use calls to system commands in PHP and CGI scripts—more commonly in CGI—and these scripts may make use of system environment variables.

In this recipe, we will exploit a Shellshock vulnerability in the Bee-box-vulnerable virtual machine to gain command of execution on the server.

How to do it...

  1. Log into http://192.168.56.103/bWAPP/.

  2. In the Choose your bug: drop-down box, select Shellshock Vulnerability (CGI) and then click on Hack:

    In the text, we can see something interesting: Current user: www-data. This may mean that the page is using system calls to get the username. It also gives us a hint: Attack the referrer.

  3. Let's see what is happening behind the curtains and use BurpSuite...

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