We discovered several vulnerabilities impacting the boot chain of several Samsung devices. Chained together, they allow us to execute code in the bootloader, get root access on Android with persistency, and finally leak anything from the Secure World's memory including the Android Keystore keys.

The following article explains how during an audit we took a look at Apache Superset and found bypasses (by reading the PostgreSQL documentation) for the security measures implemented.

The following article explains how during a Purple Team engagement we were able to identify a vulnerability in Microsoft Teams on macOS allowing us to access a user's camera and microphone.

Following a brief introduction to differential fuzzing, this blog post reviews the leading tools that leverage it for testing cryptographic primitives. In the second half, we present a method for creating a differential fuzzer along with the results we obtained.

In this blog post we present crypto-condor, an open-source test suite for compliance testing of implementations of cryptographic primitives.

The following blogpost explains how during a Red Team engagement we were able to identify several vulnerabilities including Remote Code Executions in the latest version of Chamilo.

Quarkslab was mandated by the Open Source Technology Improvement Fund, Inc. to proceed with the security assessment of the Operator Fabric project. The purpose of this assessment is to deliver an expert opinion of the security level reached by the application at a specific moment.

Drawing from our audit of Airswift's SCF, we discuss part of Soroban's security model and showcase common vulnerabilities. SCF, for "Supply Chain Financing", is the DeFi product developed by Airswift that "optimizes funds flow" between buyers and suppliers. It is developed on Stellar's smart contract platform: Soroban. Airswift mandated Quarkslab for an audit of their smart contracts, with support from the Stellar Development Foundation. In this blog post, we present the results of this audit, and share common pitfalls to avoid on Soroban.

We studied the most secure static encrypted nonce variant of "MIFARE Classic compatible" cards -- meant to resist all known card-only attacks -- and developed new attacks defeating it, uncovering a hardware backdoor in the process. And that's only the beginning...

This is a writeup of a heap pwn challenge at HitconCTF Qualifiers 2024, which explains some glibc malloc internals and some heap exploitation tricks that can be used for getting a shell!