in OpenHarmony v4.0.0 and prior versions allow a remote attacker arbitrary code execution in pre-installed apps through use after free.

This comprehensive set of reverse engineering tutorials covers x86, x64 as well as 32-bit ARM and 64-bit architectures. If you're a newbie looking to learn reversing, or just someone looking to revise on some concepts, you're at the right place. As a beginner, these tutorials will carry you from nothing upto the mid-basics of reverse engineering, a skill that everyone within the realm of cyber-security should possess. If you're here just to refresh some concepts, you can conveniently use the side bar to take a look at the sections that has been covered so far.

Penetration Testing and Red Teaming blogs, webcasts, and podcasts created by the pen testers and security analysts of Black Hills Information Security.

A tutorial website, we share Microsoft Windows Server, Linux Server, Firewalls, Cloud, Virtualization, and Networking related tutorials.

This is not a tutorial for absolute beginners on how to get started with programming assembly, or a “assembly for dummies” guide. Rather, it is a set of notes and observations I have made while on my own journey into the Microsoft x64 calling conventions that I hope will be useful to others who attempt the same path. Especially since there seems to a dearth of useful information out there regarding some of the stumbling blocks I've come across.

My name is Brandon Marshall (aka Marsh) I am currently working as an Offensive Security Researcher. A majority of my time is spent developing internal Red Team tooling, reverse engineering, and exploit creation.

Free Training Tutorials & Videos for IT Courses. provides a variety of resources that can be used to learn about vulnerability analysis, exploit development, software debugging, binary analysis, and general cyber security issues.

MakeUseOf was founded in 2006 and acquired and owned by Valnet Inc. since 2020., MUO is one of the largest online technology publications that millions of readers every turn to every month for expert tech guidance. We also have hundreds of thousands of fans across social media on Instagram, Facebook, X (Twitter), and Pinterest.

Security - Free source code and tutorials for Software developers and Architects."

Null Byte is a white hat hacker world for anyone interested in hacking, science, networking, social engineering, security, pen-testing, getting root, zero days, etc.

Your one-stop-shop to learn all about Blockchain development and Crypto Technologies.

Awesome write-ups from the world’s best hackers intopics ranging from bug bounties, CTFs, Hack the box walkthroughs, hardware challenges, and real-life encounters.

This repository is for the Offensive Security and Reverse Engineering Course. I used to teaching at Champlain College and currently sharing it for free online (check the YouTube channel for the recordings).