[tor-bugs] #7277 [Tor]: timestamp leaked in TLS client hello

Tor Bug Tracker & Wiki blackhole at torproject.org
Tue Jul 30 00:01:05 UTC 2013

#7277: timestamp leaked in TLS client hello
 Reporter:  proper      |          Owner:                    
     Type:  defect      |         Status:  new               
 Priority:  normal      |      Milestone:  Tor: 0.2.5.x-final
Component:  Tor         |        Version:                    
 Keywords:  tor-client  |         Parent:                    
   Points:              |   Actualpoints:                    

Comment(by arma):

 Hey, isn't the timestamp in the clienthello (and serverhello), and thus
 visible to external observers too?

 So a) a passive adversary of the client can do this tracking too, not just
 the guard

 and b) if we stop putting (something similar to) the time there, we have
 introduced an "is it tor tls or other tls" identifier.

Ticket URL: <https://trac.torproject.org/projects/tor/ticket/7277#comment:9>
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