Security Basics mailing list archives

RE: an error in the NMAP docs?


From: "Michael Herz" <mherz () uwaterloo ca>
Date: Thu, 7 Apr 2005 16:15:14 -0400


-----Original Message-----
From: David Gillett [mailto:gillettdavid () fhda edu] 

  The *purpose* of the exception is NOT "to allow the machine to act 
as a DNS server".  Its purpose is to allow the client to 
receive DNS results even when these are returned using TCP 
instead of UDP.

This is exactly what I'm saying too. Right from the beginning I belive ;-)

  The NMAP docs describe exploiting a FIREWALL configuration 
intended to allow machines to act as DNS and FTP CLIENTS.

And this is what I disagree with. To me, the phrase "allow DNS (53) or
FTP-DATA (20) packets to come  through" implies a server service (ie.
requests are coming in to my DNS server on port 53).

Sorry for turning this into so many words :-(


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