DownUnderCTF 2021


CTF Archive.

Welcome to DownUnderCTF 2021

DownUnderCTF is the largest online Australian run Capture The Flag (CTF) competition with over 3000+ registered users and over 1400+ registered teams (2020). Its main goal is to try to up-skill the next generation of potential Cyber Security Professionals and increase the CTF community's size here in Australia. Prizes are only for Australian Secondary or Tertiary school students. However, our CTF is online and open for anyone to play worldwide.

Original Date: Fri, 24 Sept. 2021, 09:00 UTC — Sun, 26 Sept. 2021, 09:00 UTC
Original URL: https://play.duc.tf/
CTFtime Entry: DownUnderCTF 2021 (Online)
Organizing Team: DownUnderCTF
Original Source Repository: https://github.com/DownUnderCTF/Challenges_2021_Public?tab=readme-ov-file



Challenges

Not your typical shell game...

Admin note: the server runs in a restricted environment where some of your favourite files might not exist. If you need a file for your exploit, use a file you know definitely exists (the binary tells you of at least one!)

Author: grub

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

How the hell did they break into our firewalls? We had strong passwords and everything!

Author: nullableVoid*#7225

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

What more could you ask for than a program that loads the flag for you? Just answer a few simple questions and the flag is yours!

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

What more could you ask for than a program that checks the flag for you? Just guess and check and eventually the flag will be yours!

Use flagCheck to input the flag you get from the challenge to get the actual flag

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

AES encryption challenge.

Author: 2keebs

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

Just a simple substitution cipher to get started...

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

You and two friends have spent the past year playing an ARG that promises valuable treasures to the first team to find three secret shares scattered around the world. At long last, you have found all three and are ready to combine the shares to figure out where the treasure is. Of course, being the greedy individual you are, you plan to use your cryptography skills to deceive your friends into thinking that the treasure is in the middle of no where...

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

1337crypt is back. This time, with added complexity.

Use the python version of the challenge.

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

You know the drill. Forge a signature, get the flag.

Author: joseph#8210

Connect with SSH

Link your SSH key, then connect with: ssh [email protected]

30-Day Scoreboard:

This scoreboard reflects solves for challenges in this module after the module launched in this dojo.

7-Day | 30-Day | All-Time

Rank Hacker Badges Score