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pentesting-web/postmessage-vulnerabilities.md
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@ -68,6 +68,10 @@ In order to **find event listeners** in the current page you can:
![](../.gitbook/assets/image%20%28616%29.png)
* **Go to** _Elements --> Event Listeners_ in the developer tools of the browser
![](../.gitbook/assets/image%20%28617%29.png)
* Use a **browser extension** like [**https://github.com/benso-io/posta**](https://github.com/benso-io/posta) or [https://github.com/fransr/postMessage-tracker](https://github.com/fransr/postMessage-tracker). This browser extensions will **intercept all the messages** and show them to you.
### addEventListener check origin bypasses
@ -89,6 +93,18 @@ result.message; // "'"<b>\"
`File` object is perfect for this exploit as it has a read-only `name` property which is used by our template and will bypass `escapeHtml` function.
### X-Frame-Header bypass
In order to perform these attacks ideally you will be able to **put the victim web page** inside an `iframe`. But some headers like `X-Frame-Header` can **prevent** that **behaviour**.
In those scenarios you can still use a less stealthy attack. You can open a new tab to the vulnerable web application and communicate with it:
```markup
<script>
var w=window.open("<url>")
setTimeout(function(){w.postMessage('text here','*');}, 2000);
</script>
```
### postMessage to Prototype Pollution and/or XSS
In scenarios where the data sent through `postMessage` is executed by JS, you can **iframe** the **page** and **exploit** the **prototype pollution/XSS** sending the exploit via `postMessage`.
@ -122,4 +138,5 @@ For **more information**:
## References
* [https://jlajara.gitlab.io/web/2020/07/17/Dom\_XSS\_PostMessage\_2.html](https://jlajara.gitlab.io/web/2020/07/17/Dom_XSS_PostMessage_2.html)
* [https://dev.to/karanbamal/how-to-spot-and-exploit-postmessage-vulnerablities-36cd](https://dev.to/karanbamal/how-to-spot-and-exploit-postmessage-vulnerablities-36cd)