This post is a writeup for a challenge I was working on during justCTF 2023. I didn’t solve it during the competition, unfortunately. But I decided to take a look at it afterwards, as it seemed interesting! (and I also needed some rev challenge for a class in the university :D)

Description

Some time ago I hosted a service that allowed me to do calculations on my computer. One day I noticed someone was executing the same code over and over again. After analyzing the network traffic, I noticed that only the initial packets change.

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The m0leCon CTF Teaser took place this weekend. We played only very lightly, as most of the team was busy organizing the HackTM CTF 2023 Finals in Timișoara. I solved this challenge only, while taking a break from exam preparation :P

Description

I wrote a simple website with some linux command examples, I hope you’ll like it!

Author: @Giotino

Approach

When first looking at a web challenge, I like to first explore its functionality without looking at the source code. Just to see what it does. And get some ideas what may be interesting to dig in further.

Kybersoutěž AKA Czech Cybersecurity Competition is a "CTF" for high school/university students in the Czech Republic. It consists of two rounds and finals. The first round is a survey covering basic CS terms and definitions. The second round, which is covered in the blog post, is more CTF-like. Both take place online. After them, if you qualify, you go to the final, which is an on-site one-day CTF. Individual phase in the morning followed by a team phase in the afternoon. If you do good in the finals, you enter a pool of participants from which you can qualify for the ECSC Czech Team for that year.