please help for solving security hole

[Ferdinand Fuchs]

hello,

I used the app "macanalysis" to check a new configured mac os x 10.2.4 server.

this app found 2 minor and this "major" security hole:

Bind:53 is active (Risk: Very High)
Resume: This server respond to an IQUERY and NXT request, this 
vulnerability can be exploited to gain root compromise.
Fix: Restrict access to 53/tcp to local clients and nameservers.

unfortunately I don't know how to close this security hole, so I 
would like to ask, if anybody can help me - many thanks in advance!

yours sincerely

ferdinand