Aperi’CTF 2019 - Émoji 🥳
Challenge details
| Event | Challenge | Category | Points | Solves |
|---|---|---|---|---|
| Aperi’CTF 2019 | Émoji 🥳 | MISC | 50 | 24 |
Comptez le nombre d’emoji demandé par le serveur. Vous avez 3 secondes.
https://emoji.aperictf.fr
TL;DR
It was a programming challenge. We were given a website with a random list of emoji and we had to count the number of a given emoji.
Methodology
The web page ask us to count the number of emoji for 2 given (random) emoji and post the result in less than 3 seconds.
For this I made a python script:
import requests
import time
url = "http://emoji.aperictf.fr/"
s = requests.session()
r = s.get(url).text
recherche = r.split("nombre de ")[1]
r1,r2 = recherche.split(" et de ")
nb1 = r.count(r1) - 2
nb2 = r.count(r2[0]) - 2
r = s.post(url,data={"nb1":nb1,"nb2":nb2}).text
print(r)
Output:
<!doctype html>
<html>
<head>
<meta charset="UTF-8" />
<link href="https://fonts.googleapis.com/css?family=Raleway" rel="stylesheet">
<link rel="stylesheet" href="files/style.css"/>
<link rel="shortcut icon" href="files/logo.png">
</head>
<body>
<form action="/" method="post"><div id="form">
APRK{Aimemoj1} </div></form>
<script src="files/jquery-3.4.0.min.js"></script>
<script src="files/js.js"></script>
</body>
</html>
Flag
APRK{Aimemoj1}