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DNS Servers
From: Mikey van der Worp <mvdworp () utelisys com>
Date: Fri, 17 May 2013 13:29:15 +0200

Hi there,

Does somebody have a proper rule for DNS Server Detections.

We don't want users to run DNS Servers on their computer/router..
Im currently using the following rule, which i have created;

var DNS_SERVERS [_OUR_DNS_SERVERS_]
var HOME_NETWORK [_NETWORK_WHICH_SHOULD_NOT_USE_DNS_]

alert udp $HOME_NETWORK,!$DNS_SERVERS 53 -> !$DNS_SERVERS any (msg: " IP running an DNS Server."; priority:3; 
sid:10000000002;)
alert tcp $HOME_NETWORK,!$DNS_SERVERS 53 -> !$DNS_SERVERS any (msg: " IP running an DNS Server."; priority:3; 
sid:10000000003;)

The problem with these rules is that they detect every DNS Server. Even when they reply back to the "client" -> 
REFUSED. So our Threat Management System blocks the user.
Maybe somebody with any ideas?

What it needs to do is basiclly grep all the users, those who have a dns server running : and is listening to the World.

--
Mikey

Utelisys Communications B.V.
Tel: +31 (0) 20 561 8010
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