LakeCTF Quals 23 Writeup

CTFTime event link: https://ctftime.org/event/2069

Writeups

• web:
  1. GeoGuessy

Background

• Starts: 04 November 2023, 18:00 UTC
• Ends: 05 November 2023, 18:00 UTC

LakeCTF is a jeopardy-style security hacking contest organized by the polygl0ts CTF team (plus some friends!) and the EPFL School of Computer and Communication Sciences (IC).

Participants first compete in an online qualification round, and the qualified teams will physically compete in the finals in Lausanne. The top teams will have the unique chance to meet the top members of the EPFL research community.

We wish you the best of luck !

Categories:

• misc
• web
• crypto
• pwn
• rev

Overview

• Team: SBG can’t LCG (ARESx (Academic team))
• Team Solves: 15/18
• Individual Solves: 1/18
• Score: 2167/3489
• Global Rank: 14/213
• Academic Rank: 9/108
• Overall Difficulty To Me: ★★★★★★★★★★

What I’ve learned in this CTF

• web:
  1. Geolocating via stored XSS (GeoGuessy)