I'm using my raspberry pi as a home web server and, whilst I know it's never going to offer up enterprise level security, I would like to make it as secure as possible.
scanmyserver.com has indicated that the current version of OpenSSH included in
6.7p1 is insecure and the minimum version that should be used is version 7.
The full detail of the detected problems with this version is:
The kbdint_next_device function in auth2-chall.c in sshd in OpenSSH through 6.9 does not properly restrict the processing of keyboard-interactive devices within a single connection, which makes it easier for remote attackers to conduct brute-force attacks or cause a denial of service (CPU consumption) via a long and duplicative list in the ssh -oKbdInteractiveDevices option, as demonstrated by a modified client that provides a different password for each pam element on this list.
Is there any way to upgrade to this?