Great Circle Associates Firewalls
(May 1993)
 

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Subject: Re: New file transfer protocol: FSP
From: Rens Troost <rens @ stimpys . IMSI . COM>
Date: Thu, 13 May 1993 18:07:05 -0400
To: vince @ dsi . unimi . it (David Vincenzetti)
Cc: Firewalls @ GreatCircle . COM
In-reply-to: Your message of "Thu, 13 May 1993 22:10:42 -0000." <9305132010 . AA09368 @ pluto . sm . dsi . unimi . it>
Reply-to: rens @ imsi . com

>>>>> On Thu, 13 May 1993 22:10:42 +0000, vince @
 dsi .
 unimi .
 it (David Vincenzetti) said:


  vince> What do you mean by ``cloaking version of FSP''? Do you think
  vince> it is possible to fool up a firewall by just changing a port
  vince> number? If so then any nasty hacker just have to set up a
  vince> non-standard telnet daemon which binds to port 37672 and you
  vince> won't notice he's accessing your system.

Exactly, assuming you are not filtering incoming SYN packets (in which
case, say goodbye to FTP.) The bottom line - anyone on the inside will
be able to compromise your most elaborate security measures.

In security, there are no technical solutions to personnel problems.

-Rens
--
  o===============================================================o
  | J. Laurens Troost - UNIX Systems  | At Work: rens @
 imsi .
 com    |
  | Investment Management Svcs, Inc.  | At Play: rens @
 century .
 com |
  | 12 East 49th Street,  35th floor  |   Phone: (212) 339-2823   |
  | New York, New York         10017  |     Fax: (212) 444-1980   |
  o===============================================================o
     -- IMS is unlikely to share any of the above opinions --



References:
Indexed By Date Previous: Re: New file transfer protocol: FSP
From: avalon @ coombs . anu . edu . au (Darren Reed)
Next: Re: New file transfer protocol: FSP
From: vince @ dsi . unimi . it (David Vincenzetti)
Indexed By Thread Previous: Re: New file transfer protocol: FSP
From: vince @ dsi . unimi . it (David Vincenzetti)
Next: Re: New file transfer protocol: FSP
From: Marcus J Ranum <mjr @ TIS . COM>

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