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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

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...

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