Book Image

Nmap 6: Network Exploration and Security Auditing Cookbook

Book Image

Nmap 6: Network Exploration and Security Auditing Cookbook

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)
Nmap 6: Network Exploration and Security Auditing Cookbook
Credits
About the Author
Acknowledgement
About the Reviewers
www.PacktPub.com
Preface
References
Index

Brute forcing DNS records


DNS records hold a surprising amount of host information. By brute forcing them we can reveal additional targets. Also, DNS entries often give away information, for example "mail" indicating that we are obviously dealing with the mail server, or Cloudflare's default DNS entry "direct" which most of the time will point to the IP that they are trying to protect.

This recipe shows how to brute force DNS records with Nmap.

How to do it...

Open your terminal and type:

#nmap --script dns-brute <target>

The results should include a list of DNS records found if successful:

# nmap --script dns-brute host.com

Nmap scan report for host.com (XXX.XXX.XXX.XXX)
Host is up (0.092s latency).
Other addresses for host.com (not scanned): YYY.YY.YYY.YY ZZ.ZZZ.ZZZ.ZZ
Not shown: 998 filtered ports
PORT    STATE SERVICE
80/tcp  open  http
443/tcp open  https

Host script results:
| dns-brute:
|   DNS Brute-force hostnames
|     www.host.com – AAA.AA.AAA.AAA
|     www.host.com – BB...