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
Credits
About the Author
Acknowledgments
About the Reviewer
www.PacktPub.com
Customer Feedback
Preface
13
Brute Force Password Auditing Options
17
References and Additional Reading

Collecting valid e-mail accounts and IP addresses from web servers


Valid e-mail accounts are useful in penetration testing engagements because they can be used for exploiting trust relationships in phishing attacks, password auditing of mail servers, and as usernames in many IT systems including Active Directory services.

This recipe illustrates how to get a list of valid public e-mail accounts with Nmap.

How to do it...

Open your terminal and enter the following command:

# nmap -p <Port> --script http-grep <target>

 

Nmap will crawl the web application and return any interesting information found, as follows:

# nmap -p443 --script http-grep nmap.org  
   Nmap scan report for nmap.org (45.33.49.119) 
   Host is up, received syn-ack (0.072s latency). 
   Other addresses for nmap.org (not scanned):     
   2600:3c01::f03c:91ff:fe98:ff4e 
   rDNS record for 45.33.49.119: ack.nmap.org 
   Scanned at 2016-08-22 10:44:08 CDT for 9s 
   PORT    STATE SERVICE REASON 
   443/tcp open  https...