At 07:45 16-12-1999 -0500, you wrote:
>Is there any book, white paper, etc., that details each port, such as their
>functions, problems, vulnerabilities, etc? I would like to know by open the
>POP3 port 110 what security problems do I open my network up to and so
>on....
To know more about some of the most commonly used ports try, for instance,
"Building Internet Firewalls", from Brent Chapman and Elisabeth Zwicky.
Opening access to the POP3 port has two security problems:
(1) the server may me compromised if it has some bug (it should be as
secure as possible);
(2) if you don't use APOP or Kerberos authentication, the user passwords
will go in clear text so they can be captured, and normaly the users e-mail
have the name of his account (same password also).
I hope this will help,
Nuno
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