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Basically, if you have a patched SSH client with the right ED448 key you can have the gigged sshd on the other side run whatever commands you want. The demo just does id > /tmp/.xz but it could be whatever command you want.
Somebody wrote a PoC for it: https://github.com/amlweems/xzbot#backdoor-demo
Basically, if you have a patched SSH client with the right ED448 key you can have the gigged sshd on the other side run whatever commands you want. The demo just does
id > /tmp/.xz
but it could be whatever command you want.