Book Image

Metasploit Penetration Testing Cookbook - Third Edition

By : Daniel Teixeira, Abhinav Singh, Nipun Jaswal, Monika Agarwal
Book Image

Metasploit Penetration Testing Cookbook - Third Edition

By: Daniel Teixeira, Abhinav Singh, Nipun Jaswal, Monika Agarwal

Overview of this book

Metasploit is the world's leading penetration testing tool and helps security and IT professionals find, exploit, and validate vulnerabilities. Metasploit allows penetration testing automation, password auditing, web application scanning, social engineering, post exploitation, evidence collection, and reporting. Metasploit's integration with InsightVM (or Nexpose), Nessus, OpenVas, and other vulnerability scanners provides a validation solution that simplifies vulnerability prioritization and remediation reporting. Teams can collaborate in Metasploit and present their findings in consolidated reports. In this book, you will go through great recipes that will allow you to start using Metasploit effectively. With an ever increasing level of complexity, and covering everything from the fundamentals to more advanced features in Metasploit, this book is not just for beginners but also for professionals keen to master this awesome tool. You will begin by building your lab environment, setting up Metasploit, and learning how to perform intelligence gathering, threat modeling, vulnerability analysis, exploitation, and post exploitation—all inside Metasploit. You will learn how to create and customize payloads to evade anti-virus software and bypass an organization's defenses, exploit server vulnerabilities, attack client systems, compromise mobile phones, automate post exploitation, install backdoors, run keyloggers, highjack webcams, port public exploits to the framework, create your own modules, and much more.
Table of Contents (20 chapters)
Title Page
Copyright and Credits
Contributors
Packt Upsell
Preface
Index

Denial of Service


A Denial of Service (DoS) attack denies legitimate users access to computer services (or resources), usually by overloading the service with requests or by exploiting vulnerabilities, resulting in a degradation of performance, and possibly crashing the service or even the operating system.

Getting ready

SMBLoris is a remote and uncredentialed DoS attack against Microsoft Windows operating systems, caused by a 20+ year old vulnerability in the Server Message Block (SMB) network protocol implementation.

How to do it...

  1. Before using the SMBLoris NBSS Denial of Service auxiliary DoS module, we need to use the ulimit command to set the maximum number of open file descriptors to 65535, so we can handle simultaneous connections:
root@kali:~# ulimit -n 65535
root@kali:~# ulimit -n
65535
root@kali:~#
  1. Now that we have set the maximum number of simultaneous connections to 65535, we can use the SMBLoris NBSS Denial of Service auxiliary DoS module to attack our target, by simply setting the...