I have the real way to prevent #openssh backdoors. Never enable sshd on a system and instead go back to the old tried and true method of communicating remotely over physical RS-232 instead.
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Lasse Colin posted an update on the #xz #openssh backdoor situation. It doesn't give a lot of details, but still useful as a primary source of information.
TL;DR: Damage control is underway in the project, but it's been somewhat inhibited by #Github taking it down and suspending Lasse's account.
https://tukaani.org/xz-backdoor/