[tor-bugs] #10419 [Firefox Patch Issues]: Can requests to 127.0.0.1 be used to fingerprint the browser?

Tue Dec 17 01:38:30 UTC 2013

#10419: Can requests to 127.0.0.1 be used to fingerprint the browser?
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 Reporter:  mikeperry             |          Owner:  mikeperry
     Type:  task                  |         Status:  new
 Priority:  major                 |      Milestone:
Component:  Firefox Patch Issues  |        Version:
 Keywords:  tbb-fingerprinting    |  Actual Points:
Parent ID:                        |         Points:
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 If a site makes connection attempts or element loads sourced for
 127.0.0.1, can it build a list of open local TCP ports for fingerprinting
 purposes? Open ports may yield different error conditions than closed
 ports for certain request types and elements..

 There may be other vectors to to this through DNS rebinding too, but I
 believe in those cases the hostname should always be provided to the SOCKS
 port, and such connections will happen to the exit, which should block
 them.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/10419>
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