![]() To start OllyDbg on Windows XP/2003 or below, simply double click on the OllyDbg executable or shortcut, just as you would any other Windows application. Help in calculating relative address differencesīefore starting OllyDbg, you need to ensure that you are using an account that has the appropriate privileges, generally local Administrator equivalent.Methods for directing code execution in the debugger.We cover the following subjects in the second article: The 20 second guide to X86 Assembly language for exploit writers.Opening and Attaching to the debugging target application.This tutorial is broken up into two articles and the first article will cover the following subjects: You may want to familiarize yourself with how the vulnerability was discovered here: This can be downloaded from here:īefore beginning this tutorial, we will be referring to a vulnerability we discovered in an earlier exercise. You will also, obviously, need a copy of the OllyDbg debugger, version 1.10. You can run the scripts from another location if you wish, but you will need to modify some of the command line options accordingly. All of the commands in this tutorial referencing Perl scripts will be provided under the assumption that they are being run from the same system that is running OllyDbg. ActiveState has a free Perl distribution called ActivePerl you can use for this purpose. In addition, you should also install Perl on your Windows system, as this guide will make use of a number of Perl scripts in order to trigger certain actions within the debugger. Read the details provided at the download page for more information. When running this program, make sure that your firewall allows the necessary traffic, but ensure that you don’t grant access from untrusted networks like the Internet. You should obtain a copy of Vulnserver from the following link and extract the archive to your hard disk in order to follow along with the steps in this tutorial. This tutorial uses the deliberately vulnerable program Vulnserver as its debugging target. No previous debugger knowledge is required to follow along, but if you already have some skills with a debugger you can skip any areas with which you are already familiar. This tutorial is intended to build a foundation of the basic skills necessary before the more complex skills of exploit writing can be effectively taught. I found however, that this approach tended to take attention away from the main purpose of the article – to teach how to exploit software. In the past, my tendency has been to intersperse debugger usage tips into tutorials designed to teach exploitation skills. My intention with this tutorial is to provide a reference to those who want to learn how to use the OllyDbg debugger to facilitate the writing of basic to intermediate level software exploits.
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