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

How to perform a script and version scan


While performing penetration tests, reconnaissance is really important for informing the next steps of testing. Even though Nmap provides the open ports and the version of the service running on the port, you will need to know the exact version or the name of the service that is running to prepare further exploits or to gain further knowledge of the system.

The Nmap-service-probes database contains specific packet construction techniques to probe specific services and analyze the responses received from them. Nmap provides information about the service protocol, the application name, the version number, the hostname, the device type, and the OS family. It also sometimes determines whether the service is open to connections or if any default logins are available for the service:

  • -sV (version detection): This flag enables Nmap to perform version detection on the particular host. This flag has options that can be used in conjunction with it.
  • --allports...