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Nmap 6: Network Exploration and Security Auditing Cookbook

Nmap 6: Network Exploration and Security Auditing Cookbook

4.7 (9)
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Nmap 6: Network Exploration and Security Auditing Cookbook

Nmap 6: Network Exploration and Security Auditing Cookbook

4.7 (9)

Overview of this book

Nmap is a well known security tool used by penetration testers and system administrators. The Nmap Scripting Engine (NSE) has added the possibility to perform additional tasks using the collected host information. Tasks like advanced fingerprinting and service discovery, information gathering, and detection of security vulnerabilities."Nmap 6: Network exploration and security auditing cookbook" will help you master Nmap and its scripting engine. You will learn how to use this tool to do a wide variety of practical tasks for pentesting and network monitoring. Finally, after harvesting the power of NSE, you will also learn how to write your own NSE scripts."Nmap 6: Network exploration and security auditing cookbook" is a book full of practical knowledge for every security consultant, administrator or enthusiast looking to master Nmap. The book overviews the most important port scanning and host discovery techniques supported by Nmap. You will learn how to detect mis-configurations in web, mail and database servers and also how to implement your own monitoring system. The book also covers tasks for reporting, scanning numerous hosts, vulnerability detection and exploitation, and its strongest aspect; information gathering.
Table of Contents (18 chapters)
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Nmap 6: Network Exploration and Security Auditing Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
References
Index

Enumerating users in an SMTP server


E-mail accounts used as usernames are very common in web applications, and finding them is a necessary task when auditing mail servers. Enumerating users via SMTP commands can obtain excellent results, and thanks to the Nmap Scripting Engine we can automate this task.

This recipe shows how to enumerate users on an SMTP server by using Nmap.

How to do it...

To enumerate users of an SMTP server by using Nmap, enter the following command:

$ nmap -p25 –script smtp-enum-users <target>

Any usernames found will be included in the script output section:

Host script results:
| smtp-enum-users:
|_  RCPT, webmaster

How it works...

The script smtp-enum-users was written by Duarte Silva, and it attempts to enumerate users in SMTP servers by using the SMTP commands RCPT, VRFY, and EXPN.

The SMTP commands RCPT, VRFY, and EXPN can be used to determine if an account exists or not on the mail server. Let's take a look at the VRFY command only, as they all work in a similar...

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