Why CTF

A recent blog post has been going around talking about the differences between competitions like CCDC (Collegiate Cyber Defense Competition) and CTFs (Capture the Flag). It’s a good read and I thought a lot of interesting points were brought up, and figured it could be beneficial to try to respond to them some place to encourage discussion (and besides, our blog needs any excuse it can get for new content). For what it’s worth, I didn’t watch Chris Eagle’s presentations, though I imagine I don’t agree with everything he said. Likewise, I don’t disagree with everything from Matt Weeks’ blog post. This post is mostly motivated by the fact that while a discussion on security competitions is going, it makes sense to talk about some related things I have been thinking about.

Codegate 2014: membership (800pt pwnable) write-up

This is a write-up for 800 point pwnable challenge called ‘membership’ from Codegate CTF 2014 Pre-qual round. PPP was the only solver for this challenge during the competition, so I have decided to do a write-up for the challenge. Enjoy.  (awesie and ricky solved it during the competition.)

GiTS 2014: gitsmsg

tl;drgitsmsg is a messaging server. A heap overflow led to arbitrary read / write and eventual code exec
after circumventing RELRO.

GiTS 2014: Gitzino

Gitzino was the 400-point crypto problem for Ghost in the Shellcode 2014. It looked like a standard
“predict-the-RNG” problem: there’s a PRNG, a card game, and hopefully the output it gives you
provides enough data about the internal state of the PRNG to predict the future and win the game
repeatedly.