[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
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 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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Comment(by rransom):

 Replying to [comment:1 nickm]:
 > 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.

 Looks good.

 > We should consider a backport to 0.2.2.

 This should be backported.  0.2.2.x is still in TBB, and TBB users can
 still turn their Tor clients into relays (and bridges).

-- 
Ticket URL: <https://trac.torproject.org/projects/tor/ticket/6710#comment:3>
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