HackTheBox Mango Write-up

Mango was an interesting box when it comes to enumeration. It taught me to look more closely and not brush off anything just because I have seen it before. The box is also a prime lesson to aggregate your recon info in a structured manner so it’s easier to apply it at other points when you hit a dead end somewhere. There were also some nice opportunities for small, specialised attack scripts, which I particularly enjoyed!

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HackTheBox Postman Write-up

Postman was an easy-going box. It required careful enumeration and beyond that did not have too much resistance in privilege escalation. This makes it a prime example for real-world M&M security where the initial foothold is hard, but there is few resistance on the inside.

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The Web3 API has come to Python!

Last week I received an email in my inbox about a hackathon hosted by the awesome folks over at Amberdata. They are a provider for on-chain data and cover a large variety of blockchains – including Ethereum, Bitcoin, and Stellar. I have met the developers in the team in late 2018 when I was looking […]

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The 36C3 Telnet Challenge (a.k.a. Cat CTF)

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 […]

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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 the lesson to never give up on enumeration.

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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 setting, I started writing technical articles, first on an intranet website. Later GitHub gists. Finally I made the step to host my own blog.

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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 the packet hacking village. The setting is simple: You gain access to an SSH honeypot. In there you find challenges to solve and gather the credentials to the next one. The goal was to escalate through five machines and gain the secret passphrase.

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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!

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