Re: Nmap Scan Output - PIX firewall shows ports open even when disabled?

["erisk" <erisk () iinet net au>]

It opens connection then drops after 30 seconds..

Microsoft Windows 2000 [Version 5.00.2195]
(C) Copyright 1985-2000 Microsoft Corp.

C:\Documents and Settings\Administrator>netstat

Active Connections

  Proto  Local Address          Foreign Address        State
  TCP    BI-ACH:1029            XXX.XXX.XXX.:ldap       ESTABLISHED


----- Original Message ----- 
From: "Francisco Andrades" <fandrades () nextj com>
To: <security-basics () securityfocus com>
Sent: Tuesday, October 28, 2003 5:09 AM
Subject: Re: Nmap Scan Output - PIX firewall shows ports open even when
disabled?


> What does telnet to those ports report?
>
> erisk wrote:
> > Hi all,
> >
> > I have had this on a few instances and I was wondring if anyone can
verify
> > if this is something other people have found when scanning PIX's or web
> > servers in the DMZ..
> >
> > Firstly I scanned using the normal sS routine and ports were found
closed.
> > Following that I preceded to scan without pinging the host and the
output is
> > below:
> >
> > nmap -P0 XXX.XXX.XXX.XX
> >
> > Starting nmap V. 3.00 ( www.insecure.org/nmap/ )
> > Interesting ports on XXXX (X.X.X.X):
> > (The 1596 ports scanned but not shown below are in state: filtered)
> > Port       State       Service
> > 389/tcp    open        ldap
> > 1002/tcp   open        unknown
> > 1720/tcp   open        H.323/Q.931
> >
> > I have confirmed with the rulebase and the none of the ports that are
open
> > are defined in the rule base and everything elese is still explictly
denied
> > (even though PIX does it by default) by a deny IP rule. Also the
majority of
> > fixup protocols have been disbaled (except HTTP, SMTP).
> >
> > Also when I scan web servers behind the firewall with this option it
still
> > has the same ports open + HTTP and HTTPS...
> >
> > This is the third time I have had this output when using this no ping
host
> > option, so has anyone found the similar outputs? Could this be a common
way
> > to commonly identify PIX firewalls? Is there an advisory for this? And
are
> > there any workarounds so these ports are not shown on the no ping scan?
> >
> > Regards,
> > Trev
>
> -- 
> Francisco Andrades Grassi
> www.nextj.com
> Tlf: +58-414-125-7415
>
>
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The Presidio integrates PGP data encryption and XML Web Services security to 
simplify the management and deployment of PGP and reduce overall PGP costs 
by up to 80%.
FREE WHITEPAPER & 30 Day Trial - 
http://www.securityfocus.com/sponsor/ForumSystems_security-basics_031027 
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