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WARNING: Malicious code in current pre-release & testing versions/variants: F40 and rawhide affected - users of F40/rawhide need to respond
(discussion.fedoraproject.org)
this post was submitted on 29 Mar 2024
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why would the backdoor do that? It would immediately expose itself because every ssh client on the planet warns about changed host keys when connecting.
Perhaps it was a poorly worded way of suggesting that invalidating host keys would invalidate all client keys it could potentially generate? Either way it's a lot of speculation.
Resetting the keys and SSH config on any potentially compromised host is probably not a terrible idea