Re: [fw-wiz] Auditing a firewall rulebase



2008/5/14 arvind doraiswamy <arvind.doraiswamy@xxxxxxxxx>:
Hey Guys,
What parameters would you look for if you audited a large rulebase for
an enterprise firewall? These are a few I could think of. Anything
else that you guys consistently look at when managing/auditing your
firewalls? Do take note that I'm talking just singularly about the
rule-base and not other configuration information i.e: I'm not looking
at things like -- Low console session timeout OR Telnet admin
interface open etc. I'm looking at just the rulebase this time around.
Here are my parameters:

Rules which have "any" or an equivalent keyword in them
Rules where an entire subnet has been granted access to a resource
Rules where a range of IP addresses has been granted access to a resource
Rules where a large range of ports has been opened to an IP Address / Addresses
Rules where there are design issues in the protocol itself
eg. Unencrypted traffic
Rules which are redundant and can be removed from the rulebase

Thanks
Arvind
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I always spend a decent amount of time making sure that rules are in
the correct order, so a more general deny rule doesnt end up blocking
access to a specific resource just because it was higher on the list,
or vice versa

also comments, any rule with out a comment gets deleted, if it wasnt
important enough to have a comment, its not important enough to still
be here.

high use rules at the top of the list

other than that just what you already said

hope that helps

Lawrence


--
-Lawrence
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