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Nmap 6: Network Exploration and Security Auditing Cookbook

Nmap 6: Network Exploration and Security Auditing Cookbook

4.7 (9)
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Nmap 6: Network Exploration and Security Auditing Cookbook

Nmap 6: Network Exploration and Security Auditing Cookbook

4.7 (9)

Overview of this book

Nmap is a well known security tool used by penetration testers and system administrators. The Nmap Scripting Engine (NSE) has added the possibility to perform additional tasks using the collected host information. Tasks like advanced fingerprinting and service discovery, information gathering, and detection of security vulnerabilities."Nmap 6: Network exploration and security auditing cookbook" will help you master Nmap and its scripting engine. You will learn how to use this tool to do a wide variety of practical tasks for pentesting and network monitoring. Finally, after harvesting the power of NSE, you will also learn how to write your own NSE scripts."Nmap 6: Network exploration and security auditing cookbook" is a book full of practical knowledge for every security consultant, administrator or enthusiast looking to master Nmap. The book overviews the most important port scanning and host discovery techniques supported by Nmap. You will learn how to detect mis-configurations in web, mail and database servers and also how to implement your own monitoring system. The book also covers tasks for reporting, scanning numerous hosts, vulnerability detection and exploitation, and its strongest aspect; information gathering.
Table of Contents (18 chapters)
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Nmap 6: Network Exploration and Security Auditing Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
References
Index

Discovering stateful firewalls by using a TCP ACK scan


The TCP ACK scanning technique uses packets with the flag ACK on to try to determine if a port is filtered. This technique comes handy when checking if the firewall protecting a host is stateful or stateless.

This recipe shows how to perform TCP ACK port scanning by using Nmap.

How to do it...

Open your terminal and type the following command:

#nmap -sA <target>

The output follows the standard port format:

# nmap -sA 192.168.1.254


Nmap scan report for 192.168.1.254
Host is up (0.024s latency).
All 1000 scanned ports on 192.168.1.254 are unfiltered
MAC Address: 5C:4C:A9:F2:DC:7C (Huawei Device Co.)

How it works...

The argument -sA tells Nmap to launch a TCP ACK port scan against the target host. The TCP ACK port scanning technique works in the following way:

  1. A packet with the flag ACK is sent to each selected port.

  2. If the port is open or closed, a RST packet is sent by the target machine. This response also indicates that the target host...

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