This is a write-up from the 36th Chaos Communication Congress, 2019. It has been my fourth Congress. Timed shortly after Christmas, it feels like meeting a second kind of family after the holidays. Hackers from all over the world gather in Leipzig to celebrate the weirdness of our community, break technology, learn new things, and… Continue reading The 36C3 Telnet Challenge (a.k.a. Cat CTF)
HackTheBox Obscurity Write-up
Obscurity is a medium-difficulty box. It was super fun to solve because it involved great excuses for me to write some neat little helper scripts and find a vulnerability in Python code. Something you don't do too often in these challenges. Let's dive right in with a nmap scan: $ nmap -sS -sC -oN obscurity.nmap… Continue reading HackTheBox Obscurity Write-up
HackTheBox OpenAdmin Write-up
OpenAdmin is yet another medium-difficulty machine, which was a blast to hack on! It involved dealing with various stack components, such as interacting directly with a MySQL database. Furthermore, hopping across multiple users through different escalation vectors was very satisfying. Let's see how it is done! Our first nmap scan does not yield any exciting… Continue reading HackTheBox OpenAdmin Write-up
HackTheBox Traverxec Write-up
Traverxec is an interesting box, mainly because the HackTheBox team rated it as easy while the community disagreed and voted it to medium difficulty. It involved a funky privilege escalation that I had not seen before. Let's see how it's done! Our first nmap scan does not return exciting results: $ nmap -sS -sC -oN… Continue reading HackTheBox Traverxec Write-up
HackTheBox Wall Write-up
Wall was as much a fun and educational box as it was frustrating and stretching my patience. It felt like the system was updated by the creator to have some features in place meant to annoy people trying to break in. Nevertheless, there are some nice WAF evasion techniques to consider here, as well as… Continue reading HackTheBox Wall Write-up
Dear Medium,
My blogging journey has taken me far. I started writing articles about six years ago. Things got serious after I started studying Computer Science. Among the students of my class there was a lot of chatter. The tendency was that who was unable to communicate would soon start failing exams and eventually quit. In this… Continue reading Dear Medium,
The DEFCON 27 Packet Hacking Village Honeypot Challenge
This year marks the first time I got to attend DEFCON Las Vegas — one of the largest hacker conferences in the world. There are a plethora of things to discover and try out. The talks can be streamed later, but the workshops and spontaneous gatherings? A challenge that caught my eye was the honeypot challenge in… Continue reading The DEFCON 27 Packet Hacking Village Honeypot Challenge
A Code Review Story
This is the first post of a sporadic series where we will dive into the weeds of more complex Python code review samples. I will take (slightly modified) real-world code samples, explain some common mistakes that have been made, and how we can improve things. Let’s jump right in! In this scenario, we have a… Continue reading A Code Review Story
HackTheBox fs0sciety Write-up
fs0ciety is yet another low-hanging fruit among the HackTheBox challenges. It's great for beginners who want to test their process for cracking password-protected zip files and recognition of various encodings. For that, we will use fcrackzip - simply for the reason that it has been around for ages and ships with Kali by default. I… Continue reading HackTheBox fs0sciety Write-up
Explain like I’m five: Cryptographic Hashing
tl;dr Just check out the image and read the details below it if you want to know even more. 🙂 A few days back I read an article by Yunyun Chen explaining Hashing in an infographic. I enjoyed it and read some comments, which pointed out a couple of weak spots that result from common misconceptions… Continue reading Explain like I’m five: Cryptographic Hashing
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