hacking, software, it-security
HackyEaster was awesome again. From a technical point of view there weren’t too much new things, but the creativity of the provided challenges made it really fun. Including the little teaser challenge there were a total amount of 37 challenges. These challenges were divided into different levels. You could only proceed to the next level, if you have earned enough points in the current level. I really liked that new idea.
Continue reading “Hacky Easter 2021 writeup” |
This year’s HACKvent hosted on competition.hacking-lab.com has been as great as every year. There was a total amount of 28 awesome challenges with varying difficulties. |
The ALLES! CTF (ctftime.org) took place from 04/09/2020, 16:00 UTC to 06/09/2020, 19:00 UTC with a variety of interesting, creative challenges.
Within this article I want to share my writeup on the two challenges Actual ASLR 1 and 2, which were authored by LiveOverflow. What I especially liked about the challenge(s) is that you could make progression step by step even getting a first flag on the way to a full shell, which grants access to the second flag.
The article is divided into the following sections:
→Actual ASLR 1
– Binary
– Random Algorithm
– Reimplementation In Python
– First Flag
→Actual ASLR 2
– Custom Heap
– Vulnerability
– Heap Leak
– Image Base Leak
– Overwriting Function Pointer
– Final Exploit
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This year’s HACKvent was hosted on the brand new Hacking-Lab 2.0 plattform. Each day from the 1st of december until the 24th a new challenge is published raising in difficulty. The flag format changed from HV18-xxxx-xxxx-xxxx-xxxx-xxxx to HV19{...}. After all I managed to solve all 28 challenges 🙂 |
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Hidden |
| HV19.H1 Hidden One HV19.H2 Hidden Two HV19.H3 Hidden Three HV19.H4 Hidden Four |
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Easy |
| HV19.01 censored HV19.02 Triangulation HV19.03 Hodor, Hodor, Hodor HV19.04 password policy circumvention HV19.05 Santa Parcel Tracking HV19.06 bacon and eggs HV19.07 Santa Rider |
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Medium |
| HV19.08 SmileNcryptor 4.0 HV19.09 Santas Quick Response 3.0 HV19.10 Guess what HV19.11 Frolicsome Santa Jokes API HV19.12 back to basic HV19.13 TrieMe HV19.14 Achtung das Flag |
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Hard |
| HV19.15 Santa’s Workshop HV19.16 B0rked Calculator HV19.17 Unicode Portal HV19.18 Dance with me HV19.19 U+1F385 HV19.20 i want to play a game HV19.21 Happy Christmas 256 |
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Leet |
| HV19.22 The command … is lost HV19.23 Internet Data Archive HV19.24 ham radio |
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This years online qualification for the Google Capture The Flag finals (ctftime.org) ran from 22/06/2019, 00:01 UTC to 23/06/2019 23:59 UTC.
As last year, there were plenty of diversified challenges, which were worked out very well.
I tried to take at least a look at as much challenges as possible and solved the challenge Quantum Key Distribution, which was relatively easy based on the amounts of solves. Within this article I want to share my writeup on this challenge.
The writeup is divided into the following sections:
Continue reading “Google CTF 2019 (Quals) – Quantum Key Distribution” |
As every year hacking-lab.com carried out the annual Hacky Easter event with 27 challenges. As usual the variety of the challenges was awesome. I actually got full score this year 🙂 Many thanks to daubsi, who gave me a nudge once in a while on the last challenges (you can find his writeup here). |
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Easy |
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01 Twisted 02 Just Watch 03 Sloppy Encryption 04 Disco 2 05 Call for Papers 06 Dots 07 Shell we Argument 08 Modern Art 09 rorriM rorriM |
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Medium |
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10 Stackunderflow 11 Memeory 2.0 12 Decrypt0r 13 Symphony in HEX 14 White Box 15 Seen in Steem 16 Every-Thing 17 New Egg Design 18 Egg Storage |
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Hard |
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19 CoUmpact DiAsc 20 Scrambled Egg 21 The Hunt: Misty Jungle 22 The Hunt: Muddy Quagmire 23 The Maze 24 CAPTEG |
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Hidden |
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25 Hidden Egg #1 26 Hidden Egg #2 27 Hidden Egg #3 |
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The VolgaCTF 2019 Qualifier (ctftime.org) took place from 29/03/2019, 15:00 UTC to 31/03/2019 15:00 UTC.
There has been a really interesting RSA crypto challenge called Blind, which I would like to share with you in this writeup.
The article is divided into the following sections:
→ Challenge description
→ What does the script do?
→ Blind RSA Signature
→ Retrieving the Flag
The nullcon HackIM 2019 CTF (ctftime.org) ran from 01/02/2019, 16:30 UTC to 03/02/2019 04:30 UTC.
I did the pwn challenge babypwn, which was really fun to do. The following article contains my writeup being divided into the following sections:
→ Challenge description
→ Security mechanisms and disassembly
→ Signedness vulnerabilitiy
→ Format string vulnerabilitiy
→ Final exploit
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 | |
