su1329/ctf-tasks

An archive of low-level CTF challenges developed over the years

CTF Challenges

This repository contains an archive of CTF challenges I developed in the last few years for various CTFs organized by my team – Dragon Sector. They are mostly software exploitation tasks with varying difficulty levels, for the x86/x64 architectures and Windows/Linux operating systems. Each subdirectory contains basic task information, original description, solution in the form of a short summary or a few slides from the post-CTF presentation, exploit code and optionally links to external solutions.

The challenges are as follows:

Name	Competition	Category	Platform	Arch.	Difficulty
Pipeline	Dragon CTF 2018	Exploitation / Programming	Linux	x64	Easy/medium
Production	Dragon CTF 2018 (Teaser)	Exploitation	Linux	x64	Easy/medium
Filesystem	CONFidence CTF 2017	Exploitation	Linux	x64	Medium
Fastcalc-hardened	CONFidence CTF 2017	Exploitation	Windows	x86	Hard
Fastcalc	CONFidence CTF 2017 (Teaser)	Exploitation	Windows	x86	Hard
Entree	CONFidence CTF 2016	Exploitation	Windows	x86	Medium
Antipasto	CONFidence CTF 2016	Exploitation	Linux	x86	Easy
Bubblegum	CONFidence CTF 2016 (Teaser)	Exploitation	Windows	x86	Hard
Night Sky	CONFidence CTF 2015	Exploitation	Linux	x64	Hard
Quarantine	CONFidence CTF 2015 (Teaser)	Exploitation	Linux	x64	Hard
Crypto Machine	CONFidence CTF 2014	Exploitation	Linux	x64	Medium
Memory	CONFidence CTF 2014	Reverse Engineering	Windows	x86	Easy
Multipurpose Calculation Machine	CONFidence CTF 2014 (Teaser)	Exploitation	Linux	x86	Medium

Running the tasks

For exploitation problems, if the program listens on a port by default, leave it running and connect to the port to interact with the task. If it reads and writes to/from stdin and stdout, you should bind it to a TCP port of your choice (e.g. with netcat or socat on Linux, and the enclosed AppJailLauncher.exe tool on Windows), and connect to it to exploit the vulnerabilities. The goal is to obtain the contents of the flag.txt (or similar) file in the task's current directory.

For reverse-engineering problems, the goal is to extract the flag from the provided executable file.

About Dragon Sector

Dragon Sector is a Polish security Capture The Flag team. It was created in February 2013 and currently has 17 active members. We frequently participate in both online and offline security Capture The Flag competitions, publish write-ups on CTF tasks, and sometimes even organize CTFs.

You can find us on CTFTime, our blog and Twitter.

Contact

Questions, comments? Let me know at [email protected].