Hi MTK,
Two possible scenarios:
1) Pix is an IPsec end-point.
In this scenarios pix will reply only if "isakmp enable interface-name" is
set.
2) Pix is forwarding isakmp UDP500 to an internal IPsec end-point.
In this scenario behavior may vary if the forwarded system has isakmp up and
running or not.
My guess is that your pix is forwarding ISAKMP to an internal host (a VPN
server probably), that would explain those different scan results.
Try looking on the config for a static mapping like this:
static (inside,outside) udp interface 500 internal_host 500 netmask
255.255.255.255 0 0
Cheers,
Arley
-----Original Message-----
From: mtk@mrc.dk [mailto:mtk@mrc.dk]
Sent: segunda-feira, 27 de Março de 2006 8:45
To: pen-test@securityfocus.com
Subject: Security test of firewall dose not show UDP port 500 is open
Hi all,
We have been using Nessus for security scanning the Cisco Pix firewalls we
install for our custemers. I have one "old" repport showing ISAKMP UDM port 500
is open. The firewall isn't updated but now the port has disapeard fro the new
rapport?
We have asked Cisco if the securiyt scanner is supposed to find UDP port 500 (I
don't think so) and a CCIE from Cisco have told us "no the port is hidden."
I wonder how the port can be in the old repport?
If any one has any input please let me know.
Best regards,
MTK
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