PuTTY wish ssh2-sequence-wrap

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summary: SSH-2 replay attacks should be avoided
class: wish: This is a request for an enhancement.
difficulty: tricky: Needs many tuits.
priority: low: We aren't sure whether to fix this or not.
present-in: 2005-01-17
fixed-in: 2005-01-29 (0.58) (0.59) (0.60)

Bellare et al note that if the sequence number for SSH-2 MACs repeats itself without an intervening rekey, all sorts of attacks become possible. If PuTTY were particularly paranoid, it could force a re-key before this happens, and even kill the connection if the sequence number did wrap around. More polite would probably be a note in the documentation that turning off traffic-based re-keying is a very bad idea and to accept the worse-than-it-could-be security of connections to servers that can't re-key.

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(last revision of this bug record was at 2005-03-10 16:36:42 +0000)