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Nmap: Network Exploration and Security Auditing Cookbook

You're reading from Nmap: Network Exploration and Security Auditing Cookbook Network discovery and security scanning at your fingertips

Product type Paperback

Published in May 2017

Publisher

ISBN-13 9781786467454

Length 416 pages

Edition 2nd Edition

Languages

Lua

Tools

Nmap

Concepts

Penetration Testing

Author (1):

Paulino Calderon

View More author details

Table of Contents (18) Chapters

Preface

1. Nmap Fundamentals

2. Network Exploration FREE CHAPTER

3. Reconnaissance Tasks

4. Scanning Web Servers

5. Scanning Databases

6. Scanning Mail Servers

7. Scanning Windows Systems

8. Scanning ICS SCADA Systems

9. Optimizing Scans

10. Generating Scan Reports

11. Writing Your Own NSE Scripts

12. HTTP, HTTP Pipelining, and Web Crawling Configuration Options

13. Brute Force Password Auditing Options

Brute modes

14. NSE Debugging

15. Additional Output Options

16. Introduction to Lua

17. 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:

   PORT   STATE SERVICE REASON 
   80/tcp open   http  syn-ack 
   | http-slowloris: 
   |   Vulnerable: 
   |   theDoS attack...

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Authors (1)

Paulino Calderon

Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.

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