Book Image

CompTIA PenTest+ Study Guide

By : Mike Chapple, David Seidl
Book Image

CompTIA PenTest+ Study Guide

By: Mike Chapple, David Seidl

Overview of this book

The CompTIA PenTest+ Study Guide: Exam PT0-001 offers comprehensive preparation for the newest intermediate cybersecurity certification exam. With expert coverage of Exam PT0-001 objectives, this book is your ideal companion throughout all stages of study; whether you’re just embarking on your certification journey or finalizing preparations for the big day, this invaluable resource helps you solidify your understanding of essential skills and concepts. The book shows how to perform security assessments on desktops, mobile devices, cloud, IoT, as well as industrial and embedded systems. You'll learn how to identify security weaknesses and manage system vulnerabilities. As you progress, you'll learn methods to ensure that existing cybersecurity practices, configurations, and policies conform with current best practices. You'll assess your knowledge by simulating cyber attacks to pinpoint security weaknesses in operating systems, networks, and applications. By the end of the book, you'll have all the resources you need to prepare for the exam - identify what you already know, learn what you don’t know, and face the exam with full confidence.
Table of Contents (21 chapters)
Free Chapter
1
Acknowledgments
2
About the Authors
3
Introduction
4
Assessment Test
5
Answers to Assessment Test
18
Index
19
Advert
20
End User License Agreement

Error Handling

One of the most frequent ways a penetration tester (or attacker!) tries to exploit security flaws in software is by providing a program with unexpected input to induce an error condition. Developers should always use error-handling techniques to detect and mitigate these situations.

Most modern programming languages use a construct known as a try..catch clause to perform error handling. The try clause specifies command(s) to be executed and the catch clause executes if those commands generate any errors. The commands in the catch clause “catch” the errors and handle them appropriately. Here’s some pseudocode for a try..catch clause:

try {
     some commands
}
catch {
     other commands executed only if there is an error
}

Bash

Bash does not provide an explicit error-handling functionality. Instead of relying upon a nice try..catch function, developers who wish to implement error handling in Bash must write their own error-handling routines using...