home

Posts tagged with "writeup"

UMass CTF 2021 Postmortem

April 19, 2021 ❖ Tags: writeup, capture-the-flag

This was the first year our capture-the-flag event, UMass CTF 2021, was open to the public. The competition started Friday, March 26th at 18:00 EDT, and ended Sunday, March 8th at the same time. By the end of the competition, we had 1991 registered users, belonging to 1160 registered teams. No teams were tied, we had just one unsolved challenge, and each of the "harder" challenges had just one or two solves.

read more →

UMass CTF 2020 - suckless Writeup

December 13, 2020 ❖ Tags: writeup, capture-the-flag, security, binary-exploitation, myrddin

Well, this is certainly overdue. It's the writeup for a challenge I authored for this year's UMass CTF, which ran from October 5th to October 12th. Yes, I'm late. But when you attend a university that tried very hard to squeeze the entire semester twelve weeks, you're going to deal with burnout and not nearly enough time to do things outside of your coursework. So I'm finally coming back to the challenge now that the semester's ended.

read more →

Investigating a Backdoor.SH.SHELLBOT.AA Infection

January 22, 2020 ❖ Tags: writeup, reverse-engineering, linux, security

It's typical for the younger sibling to look up to and mimic the older sibling, which is apparently what happened while I was away at school. I'm self-hosting a few services off of a Raspberry Pi B+ back at my parents' house, and when my brother got a Pi of his own, he decided that he also wanted to use it for self-hosting. Unfortunately, he doesn't know much about security, and unintentionally did me the favor of setting up a honeypot.

read more →

Browser Games Aren't an Easy Target

January 10, 2020 ❖ Tags: writeup, programming, reverse-engineering, video-games, game-hacking, javascript

If you're about my age and had a similarly dull upbringing, you probably also have memories of playing video games behind a teacher's back whenever class involved going to some sort of "computer lab." Flash games were the thing when I was in elementary school, and when I was in middle school, I'd bring Quake with me on a flash drive. By the time I was in high school, I'd realized that these opportunities were better spent getting a head start on homework for other classes, but I did have a few friends who still passed the time playing video games. Rather than Flash games or Quake, though, these were browser games using the new-fangled HTML5 canvas. I'd practically forgotten these games existed until someone from my capture-the-flag team mentioned "krunker.io". Apparently it's one of the more popular ones. It got me thinking about how I'd go about writing cheats for a game in the browser. Writing cheats for CS:GO was a breeze, so why would this be any harder? I had some time to spare over winter break, so I decided to give it a go and see what kind of damage I could do.

read more →

Writeups for Dennis Yurichev's Reverse Engineering Challenges (#36-#74)

December 29, 2019 ❖ Tags: writeup, reverse-engineering, x86

This is the fourth and final set of for my self-imposed challenge of completing at least fifty of the exercises on Dennis Yurichev's challenges.re by the end of the year. The previous set is available here.

read more →

Writeups for Dennis Yurichev's Reverse Engineering Challenges (#23-#35)

August 18, 2019 ❖ Tags: writeup, reverse-engineering, x86

This is the third set of solutions for my self-imposed challenge of completing at least fifty of the exercises on Dennis Yurichev's challenges.re by the end of the year. The previous set is available here.

read more →

Towards Guix for DevOps

July 13, 2019 ↻ Crosspost ❖ Tags: writeup, programming, functional-programming, linux, guix, lisp, scheme, guile

Hey, there! I'm Jakob, a Google Summer of Code intern and new contributor to Guix. Since May, I've been working on a DevOps automation tool for the Guix System, which we've been calling guix deploy.

read more →

Writeups for Dennis Yurichev's Reverse Engineering Challenges (#12-#22)

May 28, 2019 ❖ Tags: writeup, reverse-engineering, x86

This is the second set of solutions for my self-imposed challenge of completing at least fifty of the exercises on Dennis Yurichev's challenges.re by the end of the year. The first set is available here.

read more →

Transitioning to Haunt

May 04, 2019 ❖ Tags: writeup, programming, lisp, scheme, emacs, emacs-lisp

Rather than study for finals this week, I spent my time moving this blog over to Haunt. Previously, I was using Hugo, and while ox-hugo made the authoring workflow tolerable, doing anything on the rendering side of things was unsavory at best. I eventually had enough and decided to look for another solution, of which Haunt was the most enticing.

read more →

Writeups for PlaidCTF 2019

April 14, 2019 ❖ Tags: writeup, security, reverse-engineering, capture-the-flag, x86, c, python

My long-lived hiatus from capture-the-flag has come to an end, as I got off my ass this weekend to play in PlaidCTF 2019. Being a one-man team is pretty lonely, but my old team wasn't playing, and even if they were, I don't know if I would've wanted to make the commute just to play with them.

read more →