Exploit Writing Tutorials (38)

Ho Ho Ho friends,

It has been a while since we posted something on the Corelan Team blog, I guess we all have been busy doing ... stuff and things, here and there.  Nevertheless, as the year is close Read more

I'm not going to spend a lot of words on this. Facts speak for themselves. 

A short while ago, I discovered this:

http://www.hackforums.net/showthread.php?tid=3031925

(you need to register to get access to the thread).  Screenshot :

idle-hands profile :

Reputation

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Recently I played with an older CVE (CVE-2008-0532, http://www.securityfocus.com/archive/1/489463, by FX) and I was having trouble debugging the CGI executable where the vulnerable function was located. Read more

A lot has been said and written already about heap spraying, but most of the existing documentation and whitepapers focus on IE7 or older versions. Although there are a number of public exploits available that target IE8, the exact technique to do so has not been really documented in detail. Of course, you can probably derive how it works by looking at those public exploits. With this tutorial, I'm going to provide you with a full and detailed overview on what heap spraying is, and how to use it on old and newer platforms. I'll start with some "ancient" techniques (or classic techniques if you will) that can be used on IE6 and IE7. We'll also look at heap spraying for non-browser applications. Next, we'll talk about precision heap spraying, which is a requirement to make DEP bypass exploits work on IE8. I'll finish this tutorial with sharing some of my own research on getting reliable heap spraying to work on IE9. Read more

Traditional Egghunter

An Egghunter is nothing more than an assembly routine to find shellcode somewhere in memory. We typically deploy an Egghunter when there is no more room in our buffer that we can use to initially redirect EIP Read more

This document describes the various commands, functionality and behaviour of mona.py. Released on june 16, this pycommand for Immunity Debugger replaces pvefindaddr, solving performance issues and offering numerous new features. pvefindaddr will still be available for download until all of its functionality has been ported over to mona. Read more

Over the last few weeks, there has been some commotion about a universal DEP/ASLR bypass routine using ROP gadgets from msvcr71.dll (written by Immunity Inc) and the fact that it might have been copied into an exploit submitted to Metasploit as part of the Metasploit bounty. I'm not going to make any statements about this, but the ROP routine itself looks pretty slick. Read more

FINALLY ! After spending almost 6 months of designing, developing and testing, and after 'surviving' 2 presentations (at AthCon and Hack In Paris), I am extremely excited and proud to present, on behalf of the entire Corelan Team, the general availability of mona.py. With this announcement, we also declare pvefindaddr officially dead from this point forward. (This doesn't mean pvefindaddr is now entirely worthless, because not all functions have been ported into mona yet, but we won't be releasing any updates to pvefindaddr anymore and the entire project page/download page will eventually disappear) Read more

Introduction

I think we all agree that bypassing DEP (and ASLR) is no longer a luxury today. As operating systems (such as Windows 7) continue to gain popularity, exploit developers are forced to deal with increasingly more memory protection Read more

Yesterday, sickn3ss (one of the frequent visitors of the #corelan channel on freenode IRC) posted a really interesting question.

The question

While testing ROP gadgets, as part of the process of building a DEP bypass exploit for WM Downloader, Read more