You obviously haven't looked into the technology and don't understand basic
concepts of authentication.
Lets review - Authentication - proving you are who you say your are.
1)Something you know - password, pin number, sequence of agreed upon ports to
knock before a separate service starts to listen to furter authenicate or
authorize access to server.
2)Something you are - fingerprint, retina scan, DNA.
3)Something you have - keyfob, certificate.
Like any technique, it is merely 1 layer of the defense. It can be implemented
in a weak way that provides little to no defense or more complex way
effectively adding to the layers of defense.
I know you will respond to this please keep it to under 3 pages. You aren't
going to change my mind or understanding of basic security concepts. I posted
this for the benefit of those on the list that are truly trying to learn
security basics.
Jay
----- Original Message -----
From: Craig Wright [mailto:Craig.Wright@bdo.com.au]
To: tomc@targetbilling.com,kappaalphapieta@hotmail.com
Cc: security-basics@securityfocus.com
Sent: Sat, 29 Dec 2007 06:48:50 +1100
Subject: RE: Port-Knocking vulnerabilities?
Port Knocking is obfuscation and not a security technique. It was and is
designed not as a security function, but as a channel to hide communications on
compromised hosts.
It is a hacker toy and not a security tool. It is as effective as turning on
the ?IP Security? flags in a packet (just use hping and away you go).
Regards,
Dr Craig Wright (GSE-Compliance)
Craig Wright
Manager of Information Systems
Direct : +61 2 9286 5497
Craig.Wright@bdo.com.au
+61 417 683 914
BDO Kendalls (NSW)
Level 19, 2 Market Street Sydney NSW 2000
GPO BOX 2551 Sydney NSW 2001
Fax +61 2 9993 9497
www.bdo.com.au
Liability limited by a scheme approved under Professional Standards Legislation
in respect of matters arising within those States and Territories of Australia
where such legislation exists.
The information in this email and any attachments is confidential. If you are
not the named addressee you must not read, print, copy, distribute, or use in
any way this transmission or any information it contains. If you have received
this message in error, please notify the sender by return email, destroy all
copies and delete it from your system.
Any views expressed in this message are those of the individual sender and not
necessarily endorsed by BDO Kendalls. You may not rely on this message as
advice unless subsequently confirmed by fax or letter signed by a Partner or
Director of BDO Kendalls. It is your responsibility to scan this communication
and any files attached for computer viruses and other defects. BDO Kendalls
does not accept liability for any loss or damage however caused which may
result from this communication or any files attached. A full version of the
BDO Kendalls disclaimer, and our Privacy statement, can be found on the BDO
Kendalls website at http://www.bdo.com.au or by emailing
administrator@bdo.com.au.
BDO Kendalls is a national association of separate partnerships and entities.
________________________________________
From: listbounce@securityfocus.com [listbounce@securityfocus.com] On Behalf Of
Tom Corelis [tomc@targetbilling.com]
Sent: Saturday, 29 December 2007 5:20 AM
To: Kappa Alpha Pi Eta
Cc: security-basics@securityfocus.com
Subject: RE: Port-Knocking vulnerabilities?
I suppose you could do two successive port scans and hope the second
completes before the port-knockers' threshold.....
--
Tom Corelis
TBC IT
-----Original Message-----
From: listbounce@securityfocus.com [mailto:listbounce@securityfocus.com]
On Behalf Of Kappa Alpha Pi Eta
Sent: Friday, December 28, 2007 7:12 AM
To: security-basics@securityfocus.com
Subject: Port-Knocking vulnerabilities?
Hi listers.
so I read this thread about port-knocking (altough called "reflexsive
firewalls"). I'd never heard of that and found that to be an very
interesting mechanism. Now I just keep wondering, what an attacker could
possibly do to intrude system secured in such a way. So there are no
open ports at all, also, there's no way the attacker could access the
computer physically or via social engineering. The attacker knows that a
knock-server is running and that there's some daemon waiting to become
accessible (what ever that may be).
What could a attacker do to somehow get access to that machine? And how
can I secure that machine from that kind of attacks.
Thanks in advance,
Kajin
_________________________________________________________________
Express yourself instantly with MSN Messenger! Download today it's FREE!
http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
