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Learning Penetration Testing with Python

You're reading from   Learning Penetration Testing with Python Utilize Python scripting to execute effective and efficient penetration tests

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Product type Paperback
Published in Sep 2015
Publisher
ISBN-13 9781785282324
Length 314 pages
Edition 1st Edition
Languages
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Author (1):
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Christopher Duffy Christopher Duffy
Author Profile Icon Christopher Duffy
Christopher Duffy
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Table of Contents (19) Chapters Close

Learning Penetration Testing with Python
Credits
Disclaimer
About the Author
Acknowlegements
About the Reviewers
www.PacktPub.com
Preface
1. Understanding the Penetration Testing Methodology FREE CHAPTER 2. The Basics of Python Scripting 3. Identifying Targets with Nmap, Scapy, and Python 4. Executing Credential Attacks with Python 5. Exploiting Services with Python 6. Assessing Web Applications with Python 7. Cracking the Perimeter with Python 8. Exploit Development with Python, Metasploit, and Immunity 9. Automating Reports and Tasks with Python 10. Adding Permanency to Python Tools Index

Understanding the manipulation of the stack


To understand what we are trying to do with the writing of the exploit, you must understand what is happening in memory. We are going to inject data into an area of memory where there was no bound checking. This usually means that a variable was declared a specific size, and when data was copied into that variable there was no verification that the data would fit in it before copying.

This means that more data can be placed in a variable than what was intended. When that happens, the excess data spills into the stack and overwrites saved values. One of those saved values includes the EIP. The image below highlights how the injected data is pushed onto the stack and can move to overwrite the saved values.

We are going to flood the stack with a variety of characters to determine the area we need to overwrite. First, we will start with a large set of As, Bs, and Cs. The values we see while viewing our debugger data will tell us where on the stack we...

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