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

Enumerating z/OS TSO user IDs

In IBM mainframes (z/OS), the TSO login panel reveals information about authorized users through error messages. Attackers can leverage this information to enumerate valid user IDs of the system.

This recipe demonstrates how to enumerate z/OS TSO User IDs with Nmap.

How to do it...

To enumerate z/OS TSO user IDs with Nmap, enter the following command:

$ nmap -sV --script tso-enum <target>

Any valid users will be listed in the script output:

PORT   STATE SERVICE VERSION
23/tcp open  tn3270  IBM Telnet TN3270
| tso-enum:
|   TSO User ID:
|     TSO User:PETE -  Valid User ID
|     TSO User:YOLI -  Valid User ID
|     TSO User:PABLO -  Valid User ID
|_  Statistics: Performed 6 guesses in 3 seconds, average tps: 2

The script emulates a TN3270 screen. Next, we will learn...