I solved all web and the OSINT miscs with CTF.SG. Great easy-intermediate ctf overall, had fun with the high school members on our team.

Only managed to jump in for 3 hours as I had to prepare and play in Japan Rapid Chess Grand Prix. I realised I haven't written a deserialization post so here's one! Only solved part of sparta and maniac's game. Took a look at some other webs but the source wasn't included so didn't try.

Solved a couple of challenges and was leading in the first place until the admins decided to give out hints for the challenges we solved, while not giving hints for the challenges we did not. They also increased the points of some challenges manually, which happened to be the ones we didn't solve. There was also rampant flag/solution sharing in the official Discord.

Wrote one simple challenge for our first CTF - here's the writeup!

I was playing with my pet home router, when I noticed that a parameter seemed to be executed by some form of system(). I tried to escape it and got my first CVE!

Played with some members of TFNS as Team IPhone XS and it was fun! We finished 5th. Some of the challs had too much guess in them though.