RE: Securing a Win2k DNS server outside firewall...

["Bermingham, Bob" <Bob.Bermingham () idc-mcs com>]

I'm pretty sure that if you unbind File and Print sharing and client for
Microsoft Networks from the network adapter, it will stop responding to
RPC requests. If you're only using the boxes for DNS, it shouldn't cause
any problems.

-----Original Message-----
From: VNV Jeep [mailto:vnvjeep () hotmail com] 
Sent: Friday, June 06, 2003 10:05 AM
To: security-basics () securityfocus com
Subject: Securing a Win2k DNS server outside firewall...

Hi All...

I have 2 Windows 2000 DNS servers sitting on the outside of our
firewall.  
They're vanilla installs of Win2k server, both running as member
servers, 
locked down as much as possible, running a primary & secondary DNS 
configuration.  When running a port scan against these servers, one of
the 
only things that tends to worry me is that they both answer to port 135
RPC. 
  I've tried to figure out a way to prevent that port from being
available, 
but all I could find as far as answers go is that I'd need to run a
firewall 
to block it.  I did try running a small firewall on the servers, but ran

into issues since DNS tends to use a myriad of dynamic ports when
answering 
queries... Does anyone have any good ideas on how to lock down a Win2k 
server like this so that the only thing available as far as services go
is 
DNS, and the replication thereof?

Thanks in advance for your advice...

Take care,
Mike

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Bermingham, Bob - Bob.Bermingham () idc-mcs com

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