etc/passd file without shell entries

I am looking at the /etc/passwd file for Solaris 9, and noticed the following enrties:

daemon:x:1:31::/:

sys:x:2:3::/:

Daemon and sys have no shell entries, as indicatd by the colon delimiter at the end. If these 2 accounts do not have shell entries, what can they do? Is this a security exposure?

Thanks.

[336 byte] By [my_cousin_vinny] at [2007-11-26 6:40:58]