Security in Ubuntu

Hi,

I installed edubuntu fiesty, and later on forgot the password.  In a guess,
i tried in recovery mode, and i got the shell prompt.  I attempted to edit
the passwd and shadow file, and to my surprise i was able to update it.
Then later on i rebooted and logged in normal way.

now i am wondering, that the security of the system would be compromised.

is ubuntu devised in such a way?  Or is there any other way to protect the
system?

Regards,
Senthil Raja
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