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SSH protects the world’s most sensitive networks. It just got a lot weaker (arstechnica.com)

submitted 11 months ago by [email protected] to c/[email protected]

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[–] [email protected] 0 points 11 months ago* (last edited 11 months ago) (1 children)

It doesn't look that simple to me. From the Terrapin paper:

Although we suggest backward-compatible countermea- sures to stop our attacks, we note that the security of the SSH protocol would benefit from a redesign from scratch. This redesign should be guided by all findings and insights from both practical and theoretical security analysis, in a similar manner as was done for TLS 1.3.

It seems the protocol itself needs a revision and implementation-specific patches are easier and less-than-ideal solutions.

One could argue that even these solutions they provide are already changes to the protocol, and not just fixes to implementation bugs. Both the Sequence Number Reset and Full Transcript Hash add or change functionality at the communication protocol level, rather than simply covering corner cases.

[–] [email protected] 0 points 11 months ago (1 children)

Whole system rewrites are almost never a good idea

[–] [email protected] 0 points 11 months ago (1 children)

they are when fundamental assumptions change