Introduction

As the blog was a bit silent for quite some time, I figured it would be cool to put together a post ; so here it is folks, dig in!

The French company Quarkslab recently released a security challenge to win a free entrance to attend the upcoming HITBSecConf conference …

Introduction

A few months ago, I was writing a Linux kernel exploitation challenge on ARM in an attempt to learn about kernel exploitation and I thought I'd explore things a little. I chose the ARM architecture mainly because I thought it would be fun to look at. This article is …

Introduction

A year ago, I've written a Python script to leverage a bug in Python's virtual machine: the idea was to fully control the Python virtual processor and after that to instrument the VM to execute native codes. The python27_abuse_vm_to_execute_x86_code.py script wasn't really self-explanatory, so I believe only a …

Introduction

I am currently playing with pool-based memory corruption vulnerabilities. That’s why I wanted to program a PoC exploit for the vulnerability presented by Tarjei Mandt during his first talk “Kernel Pool Exploitation on Windows 7” [3]. I think it's a good exercise to start learning about pool overflows …

Introduction

The purpose of this little post is to create a piece of code able to monitor exceptions raised in a process (a bit like gynvael's ExcpHook but in userland), and to generate a report with information related to the exception. The other purpose is to have a look …

Introduction

Kryptonite was a proof-of-concept I built to obfuscate codes at the LLVM intermediate representation level. The idea was to use semantic-preserving transformations in order to not break the original program. One of the main idea was for example to build a home-made 32 bits adder to replace the add …

Introduction

Yesterday afternoon, I was peacefully coding some stuff you know but I couldn't make my code working. As usual, in those type of situations you fire up your debugger in order to understand what is going on under the hood. That was a bit weird, to give you a …

Introduction

Sometimes, when you are reverse-engineering binaries you need somehow to measure, or just to have an idea about how much "that" execution is covering the code of your target. It can be for fuzzing purpose, maybe you have a huge set of inputs (it can be files, network traffic …

Introduction

Some months ago I came across a strange couple of functions that was kind of playing with a finite-state automaton to validate an input. At first glance, I didn't really notice it was in fact a regex being processed, that's exactly why I spent quite some time to understand …