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(OT kinda I guess) Booting kernels



I am trying to lockdown a system, at least slightly, relating to the 
kernel.  I did 'chflags schg /bsd' and 'chflags schg /sbin/init' also am 
running in securelevel 2 to make this difficult to remove.

Assuming the attack has no physical access at all, so they are doing this 
entirely remotely, is there anyway they could upload a new kernel like 
bsd1 and reboot the system, and have it look for bsd1 as default?