Book Image

Mastering Kali Linux for Advanced Penetration Testing - Third Edition

By : Vijay Kumar Velu, Robert Beggs
Book Image

Mastering Kali Linux for Advanced Penetration Testing - Third Edition

By: Vijay Kumar Velu, Robert Beggs

Overview of this book

This book takes you, as a tester or security practitioner, through the reconnaissance, vulnerability assessment, exploitation, privilege escalation, and post-exploitation activities used by pentesters. To start with, you'll use a laboratory environment to validate tools and techniques, along with an application that supports a collaborative approach for pentesting. You'll then progress to passive reconnaissance with open source intelligence and active reconnaissance of the external and internal infrastructure. You'll also focus on how to select, use, customize, and interpret the results from different vulnerability scanners, followed by examining specific routes to the target, which include bypassing physical security and the exfiltration of data using a variety of techniques. You'll discover concepts such as social engineering, attacking wireless networks, web services, and embedded devices. Once you are confident with these topics, you'll learn the practical aspects of attacking user client systems by backdooring with fileless techniques, followed by focusing on the most vulnerable part of the network – directly attacking the end user. By the end of this book, you'll have explored approaches for carrying out advanced pentesting in tightly secured environments, understood pentesting and hacking techniques employed on embedded peripheral devices.
Table of Contents (21 chapters)
Title Page
About Packt

Writing your own port scanner using netcat

While attackers utilize the proxying application and Tor network, it is also possible to write their own custom network port scanner. The following one-line command can be utilized during penetration testing to identify the list of open ports just by using netcat as shown in the following screenshot:

while read r; do nc -v -z $r 1-65535; done < iplist

The same script can be modified for more targeted attacks on a single IP, as follows:

while read r; do nc -v -z target $r; done < ports

The chances of getting alerted in any intrusion detection system using custom port scanners is high.

Fingerprinting the operating system

Determining the operating system of a remote system is conducted using two types of scans:

  • Active fingerprinting: The attacker sends normal and malformed packets to the target and records its response pattern, referred to as the fingerprint. By comparing the fingerprint to a local database, the operating system can be determined.
  • Passive...