Book Image

Securing Network Infrastructure

By : Sairam Jetty, Sagar Rahalkar
Book Image

Securing Network Infrastructure

By: Sairam Jetty, Sagar Rahalkar

Overview of this book

Digitization drives technology today, which is why it’s so important for organizations to design security mechanisms for their network infrastructures. Analyzing vulnerabilities is one of the best ways to secure your network infrastructure. This Learning Path begins by introducing you to the various concepts of network security assessment, workflows, and architectures. You will learn to employ open source tools to perform both active and passive network scanning and use these results to analyze and design a threat model for network security. With a firm understanding of the basics, you will then explore how to use Nessus and Nmap to scan your network for vulnerabilities and open ports and gain back door entry into a network. As you progress through the chapters, you will gain insights into how to carry out various key scanning tasks, including firewall detection, OS detection, and access management to detect vulnerabilities in your network. By the end of this Learning Path, you will be familiar with the tools you need for network scanning and techniques for vulnerability scanning and network protection. This Learning Path includes content from the following Packt books: •Network Scanning Cookbook by Sairam Jetty •Network Vulnerability Assessment by Sagar Rahalkar
Table of Contents (28 chapters)
Title Page
Copyright and Credits
About Packt
Contributors
Preface
Index

Understanding Nmap Script Engine and its customization


The Nmap Script Engine is used to run custom scripts written by users to automate network-level actions. Typically, Nmap scripts end with a .nse extension. These scripts are used to perform the following tasks:

  • Host and port discovery: The whole purpose of Nmap being so widely used is to perform simple tasks to check whether the remote host is live or non-live, along with the current status of the ports.
  • Version detection: Nmap has a database of a variety of application and service signatures which are checked against the responses received from the ports to identify the service running on the port and sometimes the specific version as well.
  • Affected vulnerabilities: Nmap Script Engine allows users to determine whether a particular port/service is vulnerable to a specific disclosed vulnerability. It depends on the script written by the user to query data from the service running and sends custom packets based on a response to determine...