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

Sending UDP payloads by using NSE sockets


The Nmap Scripting Engine offers a robust library for handling networking I/O operations by providing an interface to Nsock. Nsock is Nmap's optimized parallel sockets library, and its flexibility allows developers to handle raw packets and decide whether to use blocking or non-blocking network I/O operations.

This recipe will go through the process of writing an NSE script that reads a payload from a file and sends a UDP packet to exploit a vulnerability in Huawei HG5xx routers.

How to do it...

Huawei HG5xx routers reveal sensitive information when they receive a special packet to UDP port 43690. This vulnerability caught my attention because this is a very popular device, works remotely, and obtains interesting information such as the PPPoE credentials, MAC address, and exact software/firmware version. Let's write a script to exploit these devices:

  1. To start, create the file huawei-hg5xx-udpinfo.nse and define the information tags:

    description=[[
    Tries...