Reversing 101 – Solving a protection scheme
In this post, we’ll look at an application reversing challenge from HTS (hackthissite.org) resembling a real-life protection scheme.
Put simple, the program creates a key for your username, and compares it to the one you enter.
The goal of the HTS challenge is to create a key generator, but I just want to demonstrate how to retrieve the password.
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BlackHat EU 2012 – Day 3
Good morning, Since doing live-blogging seemed to work out pretty well yesterday, I’ll do the same thing again today. Please join in for day 3 at BlackHat Europe 2012, in a cloudy and rainy Amsterdam. The first talk I attended today was : “Secure Password Managers” and “Military Grade Encryption” on Smartphones Andrey Belenko and […]
BlackHat EU 2012 – Day 2
Welcome back friends, at day 2 of BlackHat Europe 2012, held in the Grand Hotel Krasnapolsky in the wonderful city of Amsterdam. Today, I’m going to do things slightly different. I will try to post write-ups immediately after a presentation (and I’ll add in pictures later). I will basically update this page all the […]
BlackHat EU 2012 – Day 1
Introduction – Back in Amsterdam ! After a 2 year detour in Barcelona, BlackHat Europe has returned to Amsterdam again this year. After spending a few hours on the train, checking in at The Grand Hotel Krasnapolsky, getting my ‘media’ badge (thank you BlackHat) & grabbing a delegate bag, and finally working my way […]
Debugging Fun – Putting a process to sleep()
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.
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Exploit writing tutorial part 11 : Heap Spraying Demystified
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.
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Many roads to IAT
A few days ago a friend approached me and asked how he could see the import address table under immunity debugger and if this could be done using the command line.
I figured this would be a good time to take a look at what the IAT is, how we can list the IAT and what common reversing hurdles could be with regards to the IAT.
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WoW64 Egghunter
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 to. If we are able to load our shellcode elsewhere in process memory, the Egghunter will […]
Corelan T-Shirt Contest – Derbycon 2011
September is going to be a busy month.
With Brucon approaching very fast and Derbycon on its way as well, it looks like I will be spending more time at cons than at work :)
I’ll have the pleasure to teach the Corelan Live Exploit Development Bootcamp trainings at Brucon and Derbycon. If you are a student, make sure to check the prerequisites so we’re all set to make the training a success for everyone.
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Metasploit Bounty – the Good, the Bad and the Ugly
On June 14, 2011 HD Moore announced the Metasploit Bounty contest, offering a cash incentive for specific vulnerabilities to be submitted as modules in the Metasploit Framework. Titled “30 exploits, $5000 in 5 weeks”, a post on the Rapid7 blog lists the 30 “bounties” selected by the MSF team, waiting for someone to claim and submit a working exploit module.
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