Jun 28, 2020
CSCG 2020: Xmas Shopping Site
Like a few other members of KITCTF I participated in the 2020 Cyber Security Challenge Germany Qualification. This is a writeup for “Xmas Shopping Site”, one of the three web challenges that were part of the CTF.
Aug 26, 2017
HITB GSEC 2017: babyqemu
This is a short writeup explaining how I solved the “babyqemu” challenge of HITB GSEC 2017. I greatly enjoyed solving the challenge since I had never before written any kind of hypervisor escape.
Jul 10, 2017
Polictf 2017 - pyzzeria
This is a writeup for a fun web(+pwn) challenge called ‘pyzzeria’ from this year’s Polictf.
Jun 19, 2017
Google CTF Quals 2017 - The X Sanitizer
We participated as Eat Sleep Pwn Repeat in the qualifications for Google CTF last weekend. As expected, the CTF contained some great challenges, one of them being The X Sanitizer, a medium web challenge.
May 1, 2017
DEF CON CTF Quals 2017: insanity insanity insanity insanity insanity insanity insanity insanity insane
DEF CON Quals were this weekend, and as always, they delivered some of the hardest pwning challenges we’ve seen this year. insanity was not even one of them, but we still spent several hours solving it, and had tons of fun. The concept is a classic: The program implements a custom VM with weird operations, and you have to reverse and exploit it…
Sep 5, 2016
Tokyo Westerns/MMA CTF: Hastur Writeup
hastur was a web/pwnable/forensics, but really actually pwnable challenge in Tokyo Westerns/MMA CTF 2016. It had three stages with three different flags, with a combined point value of 850.
May 31, 2016
HITB CTF 2016: 'Special Delivery' writeup
Just a small writeup for “Special Delivery” (network 300) from HITB CTF 2016.
Apr 28, 2016
CONFidence 2016 Teaser 'spkac' writeup
This is a writeup for the “spkac” challenge from the CONFidence 2016 Teaser CTF. It was a cryptography challenge worth 200 points.
Jan 3, 2016
32C3 CTF: Ranger writeup
ranger was a pwnable worth 400 points during 32C3 CTF 2015. This is just a brief writeup of my solution, mostly to document a few things (in particular seccomp, which I’ve wanted to document for some time now).
Jan 2, 2016
32C3 CTF: Docker writeup
docker was a pwnable worth 250 points during 32C3 CTF 2015. The goal was to escape from a (slightly non-standard) docker container configuration.
Sep 21, 2015
CSAW 2015 - 'memeshop' writeup
‘memeshop’ was a pwnable worth 400 points in the latest CSAW CTF.
Jun 20, 2015
DEFCON 2015 Qualifiers 'babyecho' writeup
This is my writeup for the “babyecho” challenge from the DEFCON 2015 Qualifiers. It was worth 1 Point. (That’s probably the reason for the name babyecho.) Anyway, since this was my first time exploiting a format string vulnerability, I wanted to make a writeup.
Apr 26, 2015
PlaidCTF 2015 - TP writeup
tp was an exploitation challenge consisting of two parts, in total woth 620 points. For PlaidCTF we (KITCTF) teamed up with StratumAuhuur as “Eat Sleep Pwn Repeat” and me and Stephen worked together to solve this challenge during the CTF.
Mar 30, 2015
Advanced Heap Exploitation: 0CTF 2015 'freenote' writeup
freenote was a pwnable worth 400 points during 0CTF 2015.
Mar 27, 2015
Boston Key Party 2015 'Wood Island' writeup
Originally, I wanted to write up the write-up for the airport challenge, but since Niklas has already done that, I’m doing the Wood Island challenge instead. It was worth 150 points on the Boston Key Party 2015.
Mar 16, 2015
Smashing the Potato: Codegate 2015 'mashed_potato' writeup
mashed_potato was a pwnable worth 600 points during Codegate CTF 2015.
Mar 2, 2015
Boston Key Party 2015 'Sullivan Square' writeup
Sullivan Square was a reversing challenge worth 350 points at the Boston Key Party CTF 2015.
Mar 1, 2015
Boston Key Party 2015 'Airport' writeup
Airport was a cryptography challenge worth 500 points at the Boston Key Party CTF 2015.
Jan 19, 2015
GITS 2015 CTF 'aart' writeup
aart was a web challenge worth 200 points at the 2015 GITS CTF. There were several ways to solve it, three of which will be described here.
Jan 18, 2015
GITS 2015 CTF 'giggles' writeup
giggles was an exploitation challenge worth 300 points at the “Ghost in the Shellcode” CTF 2015.
Jan 12, 2015
InsomniHack Teaser - elysium writeup
Just a quick writeup for the elysium (200pts) challenge from the InsomniHack Teaser CTF 2015. We ended up making the 6th place during the CTF :)
Jan 9, 2015
31C3 CTF 'saas' writeup
saas was an exploitation challenge worth 50 points at the 31C3 CTF.
Dec 30, 2014
31C3 CTF 'mynx' writeup
tl;dr 1 byte overwrite => use after free condition => information leak through a format string. Combined again with the first two steps to gain code execution via a controlled call to system().
Dec 30, 2014
31C3 CTF 'devilish' writeup
devilish was a web challenge worth 30 points at the 31C3 CTF.
Dec 1, 2014
9447 CTF 2014 'europe' writeup
During 9447 CTF 2014, europe was a series of 3 exploitation challenges, all using the same binary. Each one would yield a different flag and in total those three flags where worth 700 points (200, 120, 380).