From: Andrew Court (andrew.court@bt.com)
Date: Mon Sep 03 2007 - 08:21:23 EDT
Sup,
Maybe an easier method would be to confuse any would be atacker by
changing banner information to different versions and architectures. For
example, if this is a linux box with apache, put IIS style error
pages(403, 404 etc), and replace the banner information with what you
would find on an IIS server. If I was doing an NMAP scan and it said
Linux, but the banner information was that of a Windows Machine, I would
be a bit confused, and may assume Nmap is lying(it does happen). You
could move enable port knockng so the ssh port does not get found in the
initial scans. Any further attempts at correctly identify the OS of the
server, should be noisy enough for your IDS to pick it up.
Regards,
Andrew Court
IT Security Specialist | BT Retail - Ireland |
E:Andrew.Court@bt.com |Mobile: +353 86 1720 692 | Fax: +353 1 432 5899|
www.btireland.com
-----Original Message-----
From: Jonathan Yu [mailto:jonathan.i.yu@gmail.com]
Sent: 01 September 2007 13:32
To: Gadi Evron
Cc: Attari Attari; pen-test@securityfocus.com;
pen-test-return-1078485025@securityfocus.com
Subject: Re: Block OS Detection
Hi there,
I am by no means an expert, but I believe that each TCP stack produces a
"unique" signature. Each operating system's stack behaves a certain way
and there are quirks based on the implementation, so I think that you
will still be able to fingerprint the operating system based on those
unless you do some sort of scrubbing (which would be pretty difficult).
Perhaps replacing the entire stack with something used by a lot of
people on different systems would give you the protection you require?
Jonathan Yu
On 9/1/07, Gadi Evron <ge@linuxbox.org> wrote:
> Not everything is good, but you can overwrite different packet values
> using.. a firewall for example.
>
> Just one thingie.
>
>
> On Fri, 31 Aug 2007, Attari Attari wrote:
>
> > Hello All:
> >
> > Is there a PRACTICAL solution from PRODUCTION
> > environments that can be used to block OS detection
> > from tools like NMAP? I googled and read some notes
> > but couldn't find a real world solution to blocking
> > Windows & Linux OS detection.
> >
> > I'm quite sure I'll get the right inputs here.
> >
> > Thank you.
> >
> > Attari
> >
> >
> > Unlimited freedom, unlimited storage. Get it now, on
> > http://help.yahoo.com/l/in/yahoo/mail/yahoomail/tools/tools-08.html/
> >
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