Book Image

Learn Ethical Hacking from Scratch

By : Zaid Sabih
5 (1)
Book Image

Learn Ethical Hacking from Scratch

5 (1)
By: Zaid Sabih

Overview of this book

This book starts with the basics of ethical hacking, how to practice hacking safely and legally, and how to install and interact with Kali Linux and the Linux terminal. You will explore network hacking, where you will see how to test the security of wired and wireless networks. You’ll also learn how to crack the password for any Wi-Fi network (whether it uses WEP, WPA, or WPA2) and spy on the connected devices. Moving on, you will discover how to gain access to remote computer systems using client-side and server-side attacks. You will also get the hang of post-exploitation techniques, including remotely controlling and interacting with the systems that you compromised. Towards the end of the book, you will be able to pick up web application hacking techniques. You'll see how to discover, exploit, and prevent a number of website vulnerabilities, such as XSS and SQL injections. The attacks covered are practical techniques that work against real systems and are purely for educational purposes. At the end of each section, you will learn how to detect, prevent, and secure systems from these attacks.
Table of Contents (24 chapters)
22
Discovering Vulnerabilities Automatically Using OWASP ZAP

Reading and writing files on the server

In this section, we will look at how we can use SQLi to read any file in the server. So, even if the file exists outside the /www directory, we'll be able to read it exactly as with a file-disclosure vulnerability, and we'll see how we can use it to write files and upload them to the system, just as with a file-upload vulnerability.

First, let's take a look at reading the file; we are going to set everything to null. So, our statement is going to be as follows:

union select null,load_file('/etc/passwd'),null,null,null

Instead of selecting a column or a table, we want to run a function called load_file(), and we are going to set the file that we want to load. We're going to use the same file that we had a look at in the file-inclusion vulnerability, which was /etc/passwd. The URL command is as follows:

index...