Hello gophers,

Version v0.0.0-20200220183623-bac4c82f6975 of golang.org/x/crypto fixes a
vulnerability in the golang.org/x/crypto/ssh package which allowed peers to
cause a panic in SSH servers that accept public keys and in any SSH client.

An attacker can craft an ssh-ed25519 or sk-ssh-ed25...@openssh.com public
key, such that the library will panic when trying to verify a signature
with it. Clients can deliver such a public key and signature to any
golang.org/x/crypto/ssh server with a PublicKeyCallback, and servers can
deliver them to any golang.org/x/crypto/ssh client.

This issue was discovered and reported by Alex Gaynor, Fish in a Barrel,
and is tracked as CVE-2020-9283.

Cheers,
Filippo for the Go team

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