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 (18 chapters)
13
Brute Force Password Auditing Options
17
References and Additional Reading

Brute forcing POP3 passwords


Mail servers often store very sensitive information. It is critical that organizations use strong password policies, so penetration testers need to perform brute force password auditing against them to check for weak passwords.

This recipe will show you how to launch dictionary attacks against POP3 servers with Nmap.

How to do it...

To launch a dictionary attack against POP3 with Nmap, enter the following command:

$ nmap -p110 --script pop3-brute <target>

Any valid accounts will be listed under the script output section:

   PORT    STATE SERVICE 
   110/tcp open  pop3 
   | pop3-brute: webmaster : abc123 
   |_acc1 : password 

How it works...

The pop3-brute script was submitted by Philip Pickering, and it performs brute force password auditing against POP3 servers. By default, this script uses the word lists /nselib/data/usernames.lst and /nselib/data/passwords.lst, but you can change this by configuring the brute library.

The arguments -p110 --script pop3-brute...