[tbb-bugs] #13018 [Applications/Tor Browser]: Math routines are OS fingerprintable

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Apr 22 08:08:42 UTC 2019

#13018: Math routines are OS fingerprintable
 Reporter:  mikeperry                            |          Owner:  tbb-
                                                 |  team
     Type:  defect                               |         Status:  new
 Priority:  Medium                               |      Milestone:
Component:  Applications/Tor Browser             |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  tbb-fingerprinting-os-version,       |  Actual Points:
  ff31-esr                                       |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:

Comment (by Thorin):

 Replying to [comment:31 cypherpunks]:
 > Why isn't https://bugzilla.mozilla.org/show_bug.cgi?id=531915 added to

 Alrighty! I've been trying to re-find that ticket for quite a few weeks.
 Used it many months ago and promptly lost it. Thanks. I will pass on the
 ticket number to the Tor Uplift guys

 > it's possible to detect some distros such way

 Comment 18 was 5 years ago. So far, and my resources are limited (and as
 an upstream problem means more than Tor Browser, which already changes
 their math FP), I have found nothing so far that leaks anything more than
 major platform (win/linux/mac) and in some instances 32/64 bit builds or
 OS architecture (some by default: eg a 64 bit build must be on a 64bit

 I wanted to get a ticket at bugzilla opened. I have no idea how much work
 or complexity and potential issues lie with using the same libraries over
 all platforms (which is what Chrome seems to be doing: they have the same
 FP regardless of anything I test on).

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/13018#comment:32>
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