[tor-bugs] #6710 [Tor Relay]: Tor Relays accept arbitrary destination address and port and leak information about reachability

[Tor Bug Tracker & Wiki]

#6710: Tor Relays accept arbitrary destination address and port and leak
information about reachability
-----------------------+----------------------------------------------------
 Reporter:  thejh      |          Owner:                    
     Type:  defect     |         Status:  needs_review      
 Priority:  major      |      Milestone:  Tor: 0.2.3.x-final
Component:  Tor Relay  |        Version:  Tor: unspecified  
 Keywords:             |         Parent:                    
   Points:             |   Actualpoints:                    
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Changes (by nickm):

  * priority:  normal => major
  * status:  new => needs_review
  * milestone:  Tor: unspecified => Tor: 0.2.3.x-final


Comment:

 The best/easiest fix for the worst part of this is probably just to reject
 EXTEND cells to private addresses.  The rest of this (where you probe a
 router's TCP state or firewall cfg by asking it to extend different
 places) is probably no so easy, or *as* critical.

 I've got a patch in branch bug6710_023 in my public repository that should
 go into 0.2.3.x after review.  We should consider a backport to 0.2.2.

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6710#comment:1>
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