[tor-bugs] #15515 [Tor]: Don't allow multiple INTRODUCE1s on the same circuit

[Tor Bug Tracker & Wiki]

#15515: Don't allow multiple INTRODUCE1s on the same circuit
-------------------------+-------------------------------------------------
     Reporter:  asn      |      Owner:
         Type:  defect   |     Status:  needs_review
     Priority:  normal   |  Milestone:  Tor: 0.2.6.x-final
    Component:  Tor      |    Version:
   Resolution:           |   Keywords:  026-backport 025-backport
Actual Points:           |  024-backport
       Points:           |  Parent ID:  #15463
-------------------------+-------------------------------------------------
Changes (by yawning):

 * keywords:  026-backport 025-backport => 026-backport 025-backport
     024-backport


Comment:

 This needs a spec change to document the new behavior for implementations.

 Given that a large fraction of the network is still running 0.2.4.x, IMO
 this should be backported to maint-0.2.4, otherwise there's a good chance
 that HSes will pick IPs that are running unpatched versions, and will
 still be easily DoSable.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/15515#comment:6>
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