[tbb-bugs] #13875 [Tor Browser]: Tor Browser DPI spoofing is broken if the user changes zoom level

Tor Bug Tracker & Wiki blackhole at torproject.org
Wed Dec 3 03:50:57 UTC 2014


#13875: Tor Browser DPI spoofing is broken if the user changes zoom level
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     Reporter:  isis         |      Owner:  tbb-team
         Type:  defect       |     Status:  new
     Priority:  normal       |  Milestone:
    Component:  Tor Browser  |    Version:
   Resolution:               |   Keywords:  tbb-fingerprinting
Actual Points:               |  Parent ID:
       Points:               |
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Comment (by mikeperry):

 Apparently this may also be an issue if the user tweaks some Windows DPI
 scaling option? Unclear what that is or what that means.
 https://twitter.com/0xPoly/status/539593347078164480

 I'm less concerned about zoom being detectable, especially since the
 process of zooming will cause all sorts of CSS reflows that will likely be
 detectable no matter what, at least with how zoom is currently
 implemented.

 There's also #4316 though, which is perhaps more concerning. I wonder if
 #4316 is still even an issue though. That sure is an old ticket.

--
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13875#comment:2>
Tor Bug Tracker & Wiki <https://trac.torproject.org/>
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