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 have caffeine-fuelled fun. On my initial recon walk with friends … Continue reading The 36C3 Telnet Challenge (a.k.a. Cat CTF)

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 results: On port 80, we see the default Ubuntu Apache … 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: On port 80, we see a portfolio website. Nothing exciting seems to be hidden here. … Continue reading HackTheBox Traverxec Write-up