[tbb-bugs] #16926 [Tor Browser]: Multiple OS: Tor Browser leaks domains to system DNS management.

[Tor Bug Tracker & Wiki]

#16926: Multiple OS: Tor Browser leaks domains to system DNS management.
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     Reporter:  DrMikeTwiddle  |      Owner:  tbb-team
         Type:  defect         |     Status:  new
     Priority:  critical       |  Milestone:
    Component:  Tor Browser    |    Version:  Tor: unspecified
   Resolution:                 |   Keywords:
Actual Points:                 |  Parent ID:
       Points:                 |
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Comment (by someone_else):

 The application using Tor needs to avoid doing DNS queries. TBBs Firefox
 has the setting 'Remote DNS' enabled. Firefox has a DNS manager built in
 that is at least theoretically used for all DNS queries.

 If 'Remote DNS' is enabled, that DNS manager will not do any DNS queries.
 Firefox will not do any DNS at all, it will just hand the host names to
 the socks proxy (Tor). The Tor client itself will not use DNS either, the
 exit node will resolve the host name.

 Most applications don't properly handle socks and perform local DNS
 lookups when configured to use socks - Firefox is an exception.

 Your network monitoring application may very well trigger DNS lookups.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16926#comment:2>
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