Passwd file – Corrupt

I have a problem. One of my lower admins messed with the etc/passwd file. In doing so the added the line “/sbin/” after roots login shell. Now we can’t use the root account. Bad you have to be root to modify /etc/passwd. But since root is unuasable at the time, I am unable to modify it back. Is there a quick fix out there? Is their a way to ovveride the /etc/passwd file?

Thanks in advance!

-Damon