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You're reading from  Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition

Product typeBook
Published inSep 2021
PublisherPackt
ISBN-139781838649357
Edition3rd Edition
Tools
Nmap
Concepts
Network Security
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Author (1)
Paulino Calderon
Paulino Calderon
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Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.
Read more about Paulino Calderon

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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...

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Nmap Network Exploration and Security Auditing Cookbook, Third Edition - Third Edition
Published in: Sep 2021Publisher: PacktISBN-13: 9781838649357
© 2021 Packt Publishing Limited All Rights Reserved

Author (1)

author image
Paulino Calderon

Paulino Calderon (@calderpwn on Twitter) is the cofounder of Websec, a company offering information security consulting services based in Mexico and Canada. When he is not traveling to a security conference or conducting on-site consulting for Fortune 500 companies, he spends peaceful days in Cozumel, a beautiful small island in the Caribbean, learning new technologies, conducting big data experiments, developing new tools, and finding bugs in software. Paulino is active in the open source community, and his contributions are used by millions of people in the information security industry. In 2011, Paulino joined the Nmap team during the Google Summer of Code to work on the project as an NSE developer. He focused on improving the web scanning capabilities of Nmap, and he has kept contributing to the project since then. In addition, he has been a mentor for students who focused on vulnerability detection during the Google Summer of Code 2015 and 2017. He has published Nmap 6: Network Exploration and Security Auditing Cookbook and Mastering the Nmap Scripting Engine, which cover practical tasks with Nmap and NSE development in depth. He loves attending information security conferences, and he has given talks and participated in workshops in dozens of events in Canada, the United States, Mexico, Colombia, Peru, Bolivia, and Curacao.
Read more about Paulino Calderon

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