The Codegate CTF 2019 Preliminary (ctftime.org) ran from 26/01/2019, 00:00 UTC to 27/01/2019 00:00 UTC.
Within this article I want to share my quick writeup on the challenge KingMaker.
Continue reading “Codegate CTF 2019 Preliminary – KingMaker”
HACKvent18 writeup
For the sixth time in a row now hacking-lab.com carried out the annual HACKvent. Each day from the 1st of december until the 24th a new challenge is published. I would have loved to spend more time on it, but time is a rare resource especially on the days before christmas 😉 After all I managed to solve 21 of 24 tasks:
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Easy |
| Day 01: Just Another Bar Code Day 02: Me Day 03: Catch me Day 04: pirating like in the 90ies Day 05: OSINT 1 Day 06: Mondrian Day 07: flappy.pl |
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Medium |
| Day 08: Advent Snail Day 09: fake xmass balls Day 10: >_ Run, Node, Run Day 11: Crypt-o-Math 3.0 Day 12: SmartWishList Day 13: flappy’s revenge Day 14: power in the shell |
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Hard |
| Day 15: Watch Me Day 16: Pay 100 Bitcoins Day 17: Faster KEy Exchange Day 18: Be Evil Day 19: PromoCode Day 20: I want to play a game Day 21: muffinCTF (Day 1) Day 22: muffinCTF (Day 2) Day 23: muffinCTF (Day 3) |
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Final |
| Day 24: Take the red pill, take the blue pill | |
Heap Exploitation: Off-By-One / Poison Null Byte
The goal of this article is to explain in detail how an off-by-one vulnerability on the heap also known as poison null byte can be exploited. Although this technique does not work with the latest libc, I think it can be used very good in order to demonstrate how exploits based on heap-metadata corruption work (also check out shellphish’s how2heap).
In order to do this I created a vulnerable program, which we will use as an example to create such an exploit. If you like to, you can start by analyzing and exploiting the program on your own (at least check out Environment):
–> heap.zip
Though it is not required to the exploit the program, the source-code might be helpful:
–> heap.c
The article is divided into the following sections:
–> Environment
–> Vulnerable Program
–> Heap Basics
–> Libc-Leak
–> Control Instruction Pointer
–> One Gadget
–> Final Exploit
Continue reading “Heap Exploitation: Off-By-One / Poison Null Byte”
Meepwn CTF Quals 2018 – babysandbox
The Meepwn CTF Quals 2018 (ctftime.org) ran from 13/07/2018, 19:00 UTC to 15/07/2018 19:00 UTC.
There were a lot of interesting-looking challenges. As always, time was the limiting factor 😉 I managed to spend 2 hours on saturday morning solving the pwn challenge babysandbox.
Google CTF 2018 (Quals) – writeup JS safe 2.0
The qualifications for the Google Capture The Flag 2018 (ctftime.org) ran from 23/06/2018, 00:00 UTC to 24/06/2018 23:59 UTC.
The CTF was worked out very well. There have been plenty of interesting and creative challenges.
This time I decided to focus on the category web and managed to solve the challenge JS safe 2.0, which was the easiest one of the web-challenges based on the amount of solves. Nevertheless it really took my some time to dodge all the pitfalls I stumbled upon while solving the challenge.
Continue reading “Google CTF 2018 (Quals) – writeup JS safe 2.0”
Hacky Easter 2018 writeup
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As every year hacking-lab.com carried out the annual Hacky Easter event with 27 challenges. I could not spend as much time as I would have liked to on solving the challenges, but after all I managed to collect 25 of the 27 eggs and focused on this writeup. |
RCTF 2018 – writeup cpushop
The RCTF 2018 (ctftime.org) ran from 19/05/2018, 09:00 UTC to 21/05/2018 08:59 UTC.
I wrote the following writeup for the crypto challenge cpushop.
angstromCTF 2018 – writeup hellcode
The angstromCTF 2018 (ctftime.org) ran from 16/03/2018, 20:00 UTC to 23/03/2018 00:00 UTC.
As the description on ctftime.org states, the ctf is primarily geared towards high school students but with a very wide range of challenge difficulty.
There have been a lot of interesting challenges which have been fun to do. I decided to make a writeup for the pwn challenge hellcode.
RPISEC/MBE: writeup lab09 (C++)
In the last lab we focused on Misc and Stack Cookies. In this next to last lab some characteristics when dealing with C++ are introduced.
RPISEC/MBE: writeup lab08 (Misc and Stack Cookies)
While the last lab introduced the subject of Heap Exploitation, this lab focuses on Misc and Stack Cookies.
The lab contains three levels again ranging from C to A:
–> lab8C
–> lab8B
–> lab8A
Continue reading “RPISEC/MBE: writeup lab08 (Misc and Stack Cookies)”