It's time to open Quarkslab internships season! This year, we offer new internships related to software and hardware security. Quarkslab team is always pleased to welcome new talents who want to work on complex security research subjects. If you want to face new challenges and work in a dynamic environment where curiosity and teamwork are at the heart of our way to do R&D, please apply!

This article is an introduction to Kubernetes security through the presentation of a new context discovery tool. It was built in reaction to the capture the flag challenge of the Europe 2021 KubeCon Cloud-Native Security Day CTF. We open-sourced the tool, named kdigger, on Github.

This blog post introduces QBDL (QuarkslaB Dynamic Loader) as well as a use case which runs NVIDIA NGX SDK under Linux. You can take a look at the project on Github: https://github.com/quarkslab/QBDL .

A step by step approach to reverse engineer Hyper-V and have a low level insight into Virtual Trust Levels.

How to perform snapshot-based coverage-guided fuzzing on Windows kernel components using Rewind, a tool we have just published on Github.

This article describes how Windows Defender implements its network inspection feature inside the kernel through the use of WFP (Windows Filtering Platform), how the device object’s security descriptor protects it from being exposed to potential vulnerabilities and details some bugs I found. As a complement to this post, a small utility is released to test the different bugs.

Tear-off techniques to the next level.

Oxen mandated Quarkslab to perform an audit of their instant messaging solution Session . This application, forked from Signal, aims to improve users privacy by using an onion routing mechanism . This mechanism differs from Tor's one by requiring a deposit in their own cryptocurrency to operate a Service Node (Snode ), the Oxen equivalent of a Tor Entry, Relay or Exit Node. While reviewing the architecture of this solution, we found some issues and provided recommendations to improve parts of the implementations.

This post is a quick vulnerability report summary for a vulnerability we found while fuzzing the TCP/IP stack CycloneTCP.

In this blog post we analyze a denial of service vulnerability affecting the IPv6 stack of Windows. This issue, whose root cause can be found in the mishandling of IPv6 fragments, was patched by Microsoft in their February 2021 security bulletin.