[tor-bugs] #12836 [Obfsproxy]: scramblesuit: 'State' object has no attribute 'closingThreshold'

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#12836: scramblesuit: 'State' object has no attribute 'closingThreshold'
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     Reporter:  asn        |      Owner:  asn
         Type:  defect     |     Status:  new
     Priority:  normal     |  Milestone:
    Component:  Obfsproxy  |    Version:
   Resolution:             |   Keywords:
Actual Points:             |  Parent ID:
       Points:             |
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Comment (by yawning):

 I believe this is a problem that occurs when a bridge is upgraded.  The
 state object (`scramblesuit/state.py`) uses pickling and currently does
 not have code generate the parameter in question when a pre-existing state
 object is loaded from disk.  It is relatively simple to add the
 appropriate code to `load()`.

 FWIW, the exception is triggered after a handshake has no possible hope of
 succeeding (and this only affects pre-existing bridges that upgrade) so
 it's probably not a huge priority, though bridges that display this error
 will be somewhat more vulnerable to active attacks (The point where the
 bridge gives up being static is a distinguishes of sorts).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/12836#comment:1>
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