A JavaScript-based attack called FROST enables websites to track which other tabs and applications a user has open by measuring SSD timing delays; the attack uses private site storage to continuously read a hidden file and detect tiny slowdowns, which a machine learning model then correlates with specific websites and apps, allowing cross-browser tracking through shared hardware.
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How Websites Spy on You by Timing Your SSD ActivityAdded:
One website can infer which other tabs and apps you have open just by timing your solid state drive. Researchers call the attack Frost. You only have to open the page, no clicks and no extra permission. It's JavaScript uses private site storage to measure your drive in the background. It keeps reading a huge hidden file and tracks tiny slowdowns.
Those delays show when the drive is busy with something else. A trained machine learning model can link that timing pattern to likely sites and apps. So, this is not just web tracking. It can reach across tabs and even across different browsers by watching the hardware they all share. Your browsers are separate. Your drive is one shared leak.
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