Book Image

Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition

By : Paulino Calderon
Book Image

Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition

By: Paulino Calderon

Overview of this book

Nmap is one of the most powerful tools for network discovery and security auditing used by millions of IT professionals, from system administrators to cybersecurity specialists. This third edition of the Nmap: Network Exploration and Security Auditing Cookbook introduces Nmap and its family - Ncat, Ncrack, Ndiff, Zenmap, and the Nmap Scripting Engine (NSE) - and guides you through numerous tasks that are relevant to security engineers in today’s technology ecosystems. The book discusses some of the most common and useful tasks for scanning hosts, networks, applications, mainframes, Unix and Windows environments, and ICS/SCADA systems. Advanced Nmap users can benefit from this book by exploring the hidden functionalities within Nmap and its scripts as well as advanced workflows and configurations to fine-tune their scans. Seasoned users will find new applications and third-party tools that can help them manage scans and even start developing their own NSE scripts. Practical examples featured in a cookbook format make this book perfect for quickly remembering Nmap options, scripts and arguments, and more. By the end of this Nmap book, you will be able to successfully scan numerous hosts, exploit vulnerable areas, and gather valuable information.
Table of Contents (22 chapters)
Appendix A: HTTP, HTTP Pipelining, and Web Crawling Configuration Options
Appendix Β: Brute-Force Password Auditing Options
Appendix F: References and Additional Reading

Discovering hostnames pointing to the same IP address

Web servers return different content depending on the hostname used in the HTTP request host header. By discovering new hostnames, penetration testers can access new target web applications that were inaccessible using the server's IP, thus expanding the attack surface.

This recipe shows how to discover new hostnames pointing to the same IP address.

How to do it...

  1. To discover hostnames pointing to the same IP address, use the following Nmap command:
    $nmap -sn --script hostmap-* <target>
  2. The hostmap-crtsh script returns all records that match the given IP address by querying an external service from https://crt.sh. There were other hostmap scripts that at the moment are broken because of changes in the API, but are expected to work again in the future. If there are records on the public database, they will be included in the results:
    Host script results:
    | hostmap-crtsh: 
    |   subdomains...