[tbb-bugs] #10286 [Applications/Tor Browser]: Touch events leak absolute screen coordinates

Tor Bug Tracker & Wiki blackhole at torproject.org
Thu Mar 9 16:41:49 UTC 2017

#10286: Touch events leak absolute screen coordinates
 Reporter:  mikeperry                            |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:
                                                 |  assigned
 Priority:  High                                 |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-resolution,       |  Actual Points:
  ff52-esr, tbb-testcase, tbb-firefox-patch,     |
  tbb-7.0-must, TorBrowserTeam201703             |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
                                                 |  Sponsor4

Comment (by mcs):

 The Touch objects that are accessible from the TouchEvents also contain
 "area" information including things like the radius of the area that was
 touched. I think that could be used for browser fingerprinting based on
 the size of the user's finger, how firm the touches are, etc.
 See: https://developer.mozilla.org/en-US/docs/Web/API/Touch

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10286#comment:16>
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