Signature of IPS 4003/0 - NMAP UDP from the outside W2K3 DNS server

I've read around a bit and all I can find on this tip of signature on Linux hosts. In my case, this sig is shot as Atacker = W2K3 DNS server in my DMZ. This is our external DNS (SOA) server. Until now - I can't find any reason to NOT worry - there are false positives that could be the cause?

Hello

According to the details of the benign trigger for 4003-0:

'Tools of networking, such as clear view HPs, provide mapping network capabilities. This may include a mapping of the network services available, so the scans to UDP port that can come from these systems.

Servers Active Direcory (Port 88), LDAP (Port 389) and DNS (Port 53) showed that cause false alarms positive when the answers to many questions from the same host.

The nature without State of UDP traffic, this signature can be triggered on any application that makes multiple requests for the same UDP service on another system. Because often, the application uses a different source for each port, the service responses can be confused with a port scan by the sensor. So when considering alarms for this signature, it is established that a known network service is the source for this alarm port, a filter will eliminate false alarms postive. »

In addition, from the filters section has suggested:

"Exclude as sources and destinations network management stations. Exclude the DNS / LDAP / Active Directory servers as sources. »

If the signature has recently started shooting for this DNS server, then you might want to read http://isc.sans.org/diary.html?storyid=5713 that may apply.

Tags: Cisco Security

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