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Windows 10 x86/wow64 Userland heap

Introduction Hi all, Over the course of the past few weeks ago, I received a number of "emergency" calls from some relatives, asking me to look at their computer because "things were broken", "things looked different" and "I think my computer got hacked".  I quickly realized that their computers got upgraded to Windows 10. We […]

Root Cause Analysis – Integer Overflows

Foreword Over the past few years, Corelan Team has received many exploit related questions, including "I have found a bug and I don’t seem to control EIP, what can I do ?"; "Can you write a tutorial on heap overflows" or "what are Integer overflows". In this article, Corelan Team member Jason Kratzer (pyoor) tries […]

BlackHatEU2013 – Day2 – Advanced Heap Manipulation in Windows 8

Good afternoon everyone, The next talk I will be covering today is presented by Zhenhua ‘Eric’ Liu, Senior Security researcher at Fortinet. Why doing this type of research. Facts : Exploiting memory corruption vulnerabilities are more difficult today, because of OS security improvements and Sandboxing techniques implemented into various applications.   Bypassing sandboxes often rely […]

Black Hat Europe 2013 – Preview

  Hola dear friends, There’s only a few days left until Black Hat Europe 2013 opens its doors in the beautiful city of Amsterdam, the Netherlands.   Just like past years, I’ll be covering some of the briefings (semi) live on www.corelan.be.  I’ve you’re a speaker – I’ll be the dude in the front row, typing […]

Root Cause Analysis – Memory Corruption Vulnerabilities

Introduction For the past year or so I’ve spent a significant amount of time fuzzing various applications with the hopes of identifying exploitable crashes.  Early on in my research I quickly realized that building fuzzers and generating large quantities of crashes, even for heavily targeted applications, was easy.  However, determining the exploitability of these crashes, […]

DEPS – Precise Heap Spray on Firefox and IE10

Introduction Last week, while doing my bi-weekly courseware review and update, I discovered that my heap spray script for Firefox 9 no longer works on recent versions.  Looking back at the type of tricks I had to use to make a precise spray work under Firefox 9 and IE 9, and realizing that these changes […]

Heap Layout Visualization with mona.py and WinDBG

Introduction Time flies. Almost 3 weeks have passed since we announced the ability to run mona.py under WinDBG.  A lot of work has been done on mona.py in the meantime.  We improved stability and performance, updated to pykd.pyd and ported a few additional immlib methods to windbglib. I figured this would be a good […]

HITB2012AMS Day 2 – Ghost in the Allocator

Ghost in the Allocator – Abusing the Windows 7 / 8 Low Fragmentation Heap After introducing himself, Steven Seeley, Senior Penetration Tester and Security Researcher at Stratsec starts his presentation by sharing the talk agenda: Why target the heap manager Heap terms Some Windows 7 theory WIndows 7 exploitation Changes introduced in Windows 8 Heap Windows […]

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.
Continue reading

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.
Continue reading

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