RE: Port Scanners
- From: Jim Harrison <jim@xxxxxxxxxxxx>
- To: "[ISAserver.org Discussion List]" <isalist@xxxxxxxxxxxxx>
- Date: Wed, 29 Oct 2003 06:13:32 -0800
<soapbox>
GRC.com?
Sorry William, but I wouldn't trust Steve Gibson to shave in the morning.
He's the one with primary responsibility for "stealth" and "open a port" in the
public mind.
His tools are crap. "LeakTest, for instance raises a BRF (big red flag) if you
allow FTP through the firewall. Unfortunately, most folks DO allow FTP
outbound. his "theories" are crap (remember the "raw IP in Windows" panic he
raised a couple of years ago?) and his web site is little more than a
panic-driving web-tabloid.
</soapbox>
Also, bear in mind that online scanning, no matter how well written, is only as
accurate as the traffic policies in the devices between you and the scanning
app. For instance, an ICMP unreachable response to the scanner's request may
flag as "ok", but not if it came from an intermediate device. I'll bet may of
the public scanning sites don't even validate this small, but important point.
My fav's:
- online - www.qualys.com. They are fast, accurate and don't use "pop
networking" terminology or recent events to create a demand for their serviceor
products.
- offline - scanline from www.foundstone.com. You place it on a host just
outside your ISA and let 'er rip. You compare the scanline eport with your ISA
logs and YOU KNOW the state of your firewall policies.
http://www.foundstone.com/index.htm?subnav=resources/navigation.htm&subcontent=/resources/proddesc/scanline.htm
Jim Harrison
MCP(NT4, W2K), A+, Network+, PCG
http://isaserver.org/Jim_Harrison/
http://isatools.org
Read the help / books / articles!
On Wed, 29 Oct 2003 07:59:31 +0200
"William Robertson" <robertson.william@xxxxxxxxxxxxxx> wrote:
http://www.ISAserver.org
ShieldsUP (My favourite) - https://grc.com/x/ne.dll?bh0bkyd2
Outbound - http://www.hackbusters.net/ob.html
LeakTest (More for personal firewalls, but interesting nonetheless) -
http://grc.com/lt/leaktest.htm
Internet Storm Center (Just general interest regarding ports being used in
the WWW) - http://isc.incidents.org/
FireHole (Just for Interest's sake) - http://keir.net/firehole.html
BackStealth (Also more for outbound communication) -
http://edu.supereva.it/piorio/backstealth.htm?p
FoundStone (If you're concerned about ports etc, then it's always good to
know what these guys are doing) - http://www.foundstone.com/
Cheers
William R.
-----Original Message-----
From: Johnson, Richard (NY Int) [mailto:rjohnson@xxxxxxxxxxxxxxxx]
Sent: 28 October 2003 19:06 PM
To: [ISAserver.org Discussion List]
Subject: [isalist] Port Scanners
http://www.ISAserver.org
Can anyone recommend some port scanning sites that will tell me every single
port open on a server?
Thanks,
Rich
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