Great Circle Associates Firewalls
(July 1994)
 

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Subject: Re: Security of Appletalk and Dial back modems
From: Perry The Cynic <perry @ sutr . cynic . org>
Date: Thu, 21 Jul 94 10:09:25 PDT
To: "Daniel O'Callaghan" <danny @ austin . unimelb . edu . au>
Cc: firewalls @ GreatCircle . COM
In-reply-to: Your message of Thu, 21 Jul 94 16:14:56 +1000. <Pine . 3 . 89 . 9407211648 . A14781-0100000 @ pet3 . austin . unimelb . edu . au>

> I just thought of a way to potentially subvert a firewall using appletalk.
> I'm going to have to review the Appletalk situation here... :-(
> 
> 1.  Find a poorly configured Mac which allows file-sharing to its 
>     System Folder.
> 2.  Write an ethernet-sniffing INIT and drop it into the System Folder.
> 3.  Wait for the Mac to be rebooted and collect the traffic.
> 4.  Read the results, and hope that some useful info is there.
> 
> I'm not saying the above is easy, but I think the theory looks right.

Your theory is sound, and not hard to implement.

Principle: ANY system (no matter what make/OS) on an Ethernet must be
secured in order for the network to be secure. If it's not BEHIND
a firewall, then it IS a firewall. Even if it's a Mac with an ARA modem.

Leaving an externally accessible Mac with shared-writable system folder
is the Mac equivalent of NFS-sharing a UNIX root file system with world-
writable privileges. "Dear Hacker, we have a special this week..."
  -- perry
---------------------------------------------------------------------------
Perry The Cynic                                             perry @
 cynic .
 org
To a blind optimist, an optimistic realist must seem like an Accursed Cynic.
---------------------------------------------------------------------------


References:
Indexed By Date Previous: UDP thru Firewall (Was: Prospero protocol and filters)
From: plarkin @ iphase . com (Patrick Larkin Jr)
Next: Re: UDP thru Firewall (Was: Prospero protocol and filters)
From: Brent Chapman <brent @ mycroft . GreatCircle . COM>
Indexed By Thread Previous: Re: Security of Appletalk and Dial back modems
From: "Daniel O'Callaghan" <danny @ austin . unimelb . edu . au>
Next: RE: Security of Appletalk and Dial back modems
From: Greg Merrell <GREG @ mail . msm . com>

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