SekaiCTF 2023 Writeup

CTFTime event link: https://ctftime.org/event/1923

Writeups

• Web:
  1. Scanner Service

Background

• Starts: 26 August 2023, 00:00 UTC
• Ends: 28 August 2023, 00:00 UTC

SekaiCTF is back for its second iteration! This year’s competition takes place over 48 hours, featuring various categories designed to test participants’ skills and incentivize learning. Our CTF is catered towards intermediate players, but we also have beginner-friendly challenges alongside extremely difficult ones for more advanced competitors.

Categories:

• Miscellaneous
• Crypto
• Forensics
• Reverse
• Pwn
• Programming (PPC)
• Web

Overview

• Team: Maltese Prison Escapees (AKA the meger team “if this doesn’t work we’ll get more for next year”)
• Team Solves: 35/42
• Individual Solves: 0/42
• Score: 10417
• Rank: 1/981
• Overall Difficulty To Me: ★★★★★★★★★☆

What I’ve learned in this CTF

• Web:
  1. Exploiting arugment injection (Scanner Service)