itwbennett writes: OpenSSH servers with keyboard-interactive authentication enabled, which is the default setting on many systems, including FreeBSD ones, can be tricked to allow many authentication retries over a single connection, according to a security researcher who uses the online alias Kingcope, who disclosed the issue on his blog last week. According to a discussion on Reddit, setting PasswordAuthentication to 'no' in the OpenSSH configuration and using public-key authentication does not prevent this attack, because keyboard-interactive authentication is a different subsystem that also relies on passwords.
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