Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By : Paulino Calderon
Book Image

Nmap: Network Exploration and Security Auditing Cookbook - Second Edition

By: Paulino Calderon

Overview of this book

This is the second edition of ‘Nmap 6: Network Exploration and Security Auditing Cookbook’. A book aimed for anyone who wants to master Nmap and its scripting engine through practical tasks for system administrators and penetration testers. Besides introducing the most powerful features of Nmap and related tools, common security auditing tasks for local and remote networks, web applications, databases, mail servers, Microsoft Windows machines and even ICS SCADA systems are explained step by step with exact commands and argument explanations. The book starts with the basic usage of Nmap and related tools like Ncat, Ncrack, Ndiff and Zenmap. The Nmap Scripting Engine is thoroughly covered through security checks used commonly in real-life scenarios applied for different types of systems. New chapters for Microsoft Windows and ICS SCADA systems were added and every recipe was revised. This edition reflects the latest updates and hottest additions to the Nmap project to date. The book will also introduce you to Lua programming and NSE script development allowing you to extend further the power of Nmap.
Table of Contents (25 chapters)
Title Page
About the Author
About the Reviewer
Customer Feedback
Brute Force Password Auditing Options
References and Additional Reading

Detecting web servers vulnerable to slowloris denial of service attacks

Nmap can also be used to identify web servers vulnerable to the denial of service attack known as slowloris. The slowloris denial of service technique is presumed to have been discovered by Adrian Ilarion Ciobanu back in 2007, but Rsnake released the first tool in DEFCON 17 proving that it affects several products, including Apache 1.x, Apache 2.x, dhttpd, and possibly many other web servers.

This recipe shows how to detect if a web server is vulnerable to slowloris DoS attacks with Nmap.

How to do it...

To launch a slowloris attack against a remote web server with Nmap, use the following command:

$nmap -p80 --script http-slowloris --max-parallelism 400 <target>

By default, the script will run for 30 minutes if the server keeps responding. If the server goes down, some statistics are returned:

   80/tcp open   http  syn-ack 
   | http-slowloris: 
   |   Vulnerable: 
   |   theDoS attack...