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

Detecting whether encryption is enforced in SMB servers

SMB2/3 servers support different features, and we can list those capabilities to check some aspects of their configuration security. Encryption is supported in SMB3 connections, but not everyone uses encryption as it slows down traffic.

This recipe shows how to detect whether encryption is enabled in SMB servers with Nmap.

How to do it...

Open your terminal and enter the following Nmap command:

$ nmap -p445 --script smb2-capabilities <target>

The scan results will include the detected features in the response:

| smb2-capabilities:
|   3.1.1:
|     Distributed File System
|     Leasing
|     Multi-credit operations
|     Encryption

How it works...

The script reads the response to the SMB SMB2_COM_NEGOTIATE command and parses the field describing the server capabilities. This technique...