Openssh 7.9p1 Exploit -

Or, how I learned to stop worrying and love the changelog.

for user in root admin ubuntu; do ssh -o PreferredAuthentications=none $user@target "2>&1" | grep "Permission denied (publickey)"; done

Force the server to use SHA-1 signatures. ssh -o KexAlgorithms=diffie-hellman-group14-sha1 -o HostKeyAlgorithms=ssh-rsa user@target (Spoiler: 7.9p1 still allows some weak algorithms by default. Cry about it.)

OpenSSH 7.9p1 is not a house of cards waiting for a single \x90\x90\x90 to collapse. It is a rusty lock on a wooden door. It won't break from a magic skeleton key, but it will shatter under a well-aimed shoulder barge.