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A comment on Vulnerability allows cross-browser tracking in Chrome, Firefox, Safari, and Tor. Parent comment

Re:Vulnerability allows cross-browser tracking in Chrome, Fi... by jszymborski on Thursday May 13, 2021 @07:14PM (#27148672)
It looks like a mitigation might be that in the event you do not have the application installed, to return a "denied" status and send a prompt to the user like "Unknown application protocol".

Something like that could still would be susceptible to a timing attack though.

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Re:Vulnerability allows cross-browser tracking in Chrome, Fi... by Haemm0r on Friday May 14, 2021 @08:17AM (#27153406)
always show the popup, but populate it "later" could work too.
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Re:Vulnerability allows cross-browser tracking in Chrome, Fi... by dathinab on Friday May 14, 2021 @08:25PM (#27161108)
Yes I believe the proper fix would be to always behave as if a popup is showing, independent of weather or not it actually shows.

Through it's maybe slightly more complex as you might need to behave as if the user clicked cancel in a way where a attacker can not easily differentiate it from an actual user clicking cancel.

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