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

Cracking passwords


Password is one of the basic mechanism used for authenticating a user into a system. During our information gathering and enumeration phase, we may come across various services running on the target which are password-protected such as SSH, FTP, and so on. In order to gain access to these services, we will want to crack passwords using some of the following techniques:

  • Dictionary attack: In a dictionary attack, we feed the password cracker a file with a large number of words. The password cracker then tries all the words from the supplied file as probable passwords on the target system. If matched, we are presented with the correct password. In Kali Linux, there are several word-lists which can be used for password cracking. These word-lists are located in /usr/share/wordlists as shown in the following image:

 

  • Brute-force attack: If password isn't any of the words from the word-list we provided, then we might have to launch a brute-force attack. In a brute-force attack,...