https://syedzubyl.space Hey, I'm Syed Zubyl N! Aspiring Software Engineer with a solid foundation in Java, Spring Boot, RESTful APIs, MySQL, and object-oriented programming. Zola en Wed, 12 Mar 2025 00:00:00 +0000 Wed, 12 Mar 2025 00:00:00 +0000 Syed Zubyl N https://syedzubyl.space/blog/kalmarctf-writeup-nix-build-as-a-service/ https://syedzubyl.space/blog/kalmarctf-writeup-nix-build-as-a-service/ <p>This is a write-up of the “nix-build as a service” challenge from KalmarCTF 2025, a sequel to last year’s <a href="/blog/kalmarctf-writeup-reproducible-pwning">“Reproducible Pwning”</a> challenge. To get to the solution, we will take a peek behind the curtain into how Nix derivations work internally.</p> Tue, 19 Mar 2024 00:00:00 +0000 Syed Zubyl N https://syedzubyl.space/blog/kalmarctf-writeup-reproducible-pwning/ https://syedzubyl.space/blog/kalmarctf-writeup-reproducible-pwning/ <p>This is a write-up of the “Reproducible Pwning” challenge from KalmarCTF 2024. This challenge takes us through the inner workings of Nix and a very interesting privilege escalation that has made me change my own NixOS configuration.</p>