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Example from [https://speakerdeck.com/masatokinugawa/electron-abusing-the-lack-of-context-isolation-curecon-en?slide=30](https://speakerdeck.com/masatokinugawa/electron-abusing-the-lack-of-context-isolation-curecon-en?slide=30)
This code open http(s) links with default browser:
![](<../../../.gitbook/assets/image(375).png>)
Something like `file:///C:/Windows/systemd32/calc.exe` could be used to execute a calc, the `SAFE_PROTOCOLS.indexOf` is preventing it.
Therefore, an attacker could inject this JS code via the XSS or arbitrary page navigation:
```html
<script>
Array.prototype.indexOf = function(){
return 1337;
}
</script>
```
As the call to `SAFE_PROTOCOLS.indexOf` will return 1337 always, the attacker can bypass the protection and execute the calc. Final exploit:
Example from [https://mksben.l0.cm/2020/10/discord-desktop-rce.html?m=1](https://mksben.l0.cm/2020/10/discord-desktop-rce.html?m=1)
When checking the preload scripts, I found that Discord exposes the function, which allows some allowed modules to be called via `DiscordNative.nativeModules.requireModule('MODULE-NAME')`, into the web page.\
Here, I couldn't use modules that can be used for RCE directly, such as _child\_process_ module, but I **found a code where RCE can be achieved by overriding the JavaScript built-in methods** and interfering with the execution of the exposed module.
The following is the PoC. I was able to confirm that the **calc** application is **popped** up when I c**all the `getGPUDriverVersions` function** which is defined in the module called "_discord\_utils_" from devTools, while **overriding the `RegExp.prototype.test` and `Array.prototype.join`**.
Usually the _execa_ tries to execute "_nvidia-smi.exe_", which is specified in the `nvidiaSmiPath` variable, however, due to the overridden `RegExp.prototype.test` and `Array.prototype.join`, **the argument is replaced to "**_**calc**_**" in the **_**execa**_**'s internal processing**.
Specifically, the argument is replaced by changing the following two parts.
<details><summary><strong>Support HackTricks and get benefits!</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 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** [**🐦**](https://github.com/carlospolop/hacktricks/tree/7af18b62b3bdc423e11444677a6a73d4043511e9/\[https:/emojipedia.org/bird/README.md)[**@carlospolopm**](https://twitter.com/carlospolopm)**.** **Share your hacking tricks submitting PRs to the** [**hacktricks github repo**](https://github.com/carlospolop/hacktricks)**.** </details>