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Kali Linux - An Ethical Hacker's Cookbook

Kali Linux - An Ethical Hacker's Cookbook

By : Himanshu Sharma
3.8 (20)
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Kali Linux - An Ethical Hacker's Cookbook

Kali Linux - An Ethical Hacker's Cookbook

3.8 (20)
By: Himanshu Sharma

Overview of this book

With the current rate of hacking, it is very important to pentest your environment in order to ensure advanced-level security. This book is packed with practical recipes that will quickly get you started with Kali Linux (version 2016.2) according to your needs, and move on to core functionalities. This book will start with the installation and configuration of Kali Linux so that you can perform your tests. You will learn how to plan attack strategies and perform web application exploitation using tools such as Burp, and Jexboss. You will also learn how to perform network exploitation using Metasploit, Sparta, and Wireshark. Next, you will perform wireless and password attacks using tools such as Patator, John the Ripper, and airoscript-ng. Lastly, you will learn how to create an optimum quality pentest report! By the end of this book, you will know how to conduct advanced penetration testing thanks to the book’s crisp and task-oriented recipes.
Table of Contents (13 chapters)
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6
Wireless Attacks – Getting Past Aircrack-ng

Bypassing firewalls with Nmap


Most of the time during a pentest, we will come across systems protected by firewalls or Intrusion Detection Systems (IDS). The Nmap provides different ways to bypass these IDS/firewalls to perform port scans on a network. In this recipe, we will learn some of the ways we can bypass firewalls.

TCP ACK scan

The ACK scan (-sA) sends acknowledgment packets instead of SYN packets, and the firewall does not create logs of ACK packets as it will treat ACK packets as responses to SYN packets. It is mostly used to map the type of firewall being used.

How to do it...

The ACK scan was made to show unfiltered and filtered ports instead of open ones.

The command for ACK scan is:

nmap -sA x.x.x.x

Let's look at the comparison of how a normal scan differs from an ACK scan:

 

Here we see the difference between a normal scan and an ACK scan:

How it works...

The scan results of filtered and unfiltered ports depends on whether a firewall being used is stateful or stateless. A stateful firewall...

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