[tor-bugs] #22961 [Core Tor/Tor]: Should tor-spec say that nodes MUST NOT use TLS compression?

Tor Bug Tracker & Wiki blackhole at torproject.org
Mon Jul 17 23:28:48 UTC 2017


#22961: Should tor-spec say that nodes MUST NOT use TLS compression?
------------------------------+--------------------------------
     Reporter:  teor          |      Owner:
         Type:  defect        |     Status:  new
     Priority:  Medium        |  Milestone:  Tor: 0.3.2.x-final
    Component:  Core Tor/Tor  |    Version:
     Severity:  Normal        |   Keywords:  tor-spec security
Actual Points:                |  Parent ID:  #18856
       Points:                |   Reviewer:
      Sponsor:                |
------------------------------+--------------------------------
 In general, it's unsafe to compress attacker-controlled data and secret
 data together in the same blocks, because attackers can use compressed
 data size to discover the secret (as in the CRIME attack).

 Discovered as part of #22948.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/22961>
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