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  • #6252
Closed (moved) (moved)
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Issue created Jun 28, 2012 by Roger Dingledine@arma

We obey sendme cells even when we shouldn't get them

A client can send sendme cells preemptively to the exit relay, allowing:

  • cheating on her flow/congestion control, to get her bytes faster

  • DoS on the network, by adding way more cells into the network than she was supposed to.

  • perhaps a memory DoS on the entry relay, if she stops reading from the TLS connection but keeps up the blitz of sendme cells.

I believe the fix is to tear down the circuit when we get a sendme we should not have gotten.

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