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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

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Product type Paperback
Published in May 2017
Publisher
ISBN-13 9781786467454
Length 416 pages
Edition 2nd Edition
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Author (1):
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Paulino Calderon Paulino Calderon
Author Profile Icon Paulino Calderon
Paulino Calderon
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Table of Contents (18) Chapters Close

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 14. NSE Debugging 15. Additional Output Options 16. Introduction to Lua 17. References and Additional Reading

Detecting web application firewalls


Web servers are often protected by packet filtering systems that drop or redirect suspected malicious packets. Web penetration testers benefit from knowing that there is a traffic filtering system between them and the target application. If that is the case, they can try more rare or stealthy techniques to try to bypass the Web Application Firewall (WAF) or Intrusion Prevention System (IPS).

This recipe demonstrates how to use Nmap to detect packet filtering systems, such as a WAF or an IPS in front of a web application.

How to do it...

  1. To detect WAF or IPS use the following command:
$ nmap -p80 --script http-waf-detect,http-waf-fingerprint <target>
  1. The script http-waf-detect will let you know if a packet filtering system was detected:
   PORT   STATE SERVICE 
   80/tcp open  http 
   |_http-waf-detect: IDS/IPS/WAF detected 
  1. The script http-waf-fingerprint will return the product name if identified:
   PORT   STATE SERVICE REASON 
   80/tcp open  http  ...
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