Writeup
0xFun CTF | OSINT Challenges Writeup
Feb 15, 2026OSINTMedium
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I’m Ahmed (aka Pizza Steve), a pizza-fueled CTF player. I turn the challenges I crack into writeups you can actually follow and reproduce.
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A walkthrough of the Hackfinity Battle Encore challenges I solved, starting with the OSINT tasks and the lessons behind each pivot.
A web challenge write-up that chains ZIP validation weaknesses, a TOCTOU bug, and Zip Slip into remote code execution.