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RE: Vulnerability testing in analog modem
From: jfvanmeter () comcast net
Date: Tue, 30 Oct 2007 07:10:26 +0000

Hello Craig, A "fax machine" usually consists of an image scanner, a modem, and a printer combined into a single 
package. 

I seam to remember back in the late 90s, there was a way to gain tech support remote access to the modem via the Hayes 
Modem AT strings. It was something similar to the &T command. Maybe it twas &T2

&Tn - Test and diagnostics; 0=End current test; 1=Start local analog loop back test; 2=Unknown; 3=Start local digital 
loop back test 4=Grant remote request for remote digital loop back test; 5=Deny remote request for remote digital loop 
back test; 6=Start remote digital loop back test; 7=Start remote digital loop back test with self-test; 8=Start local 
analog loop back test with self-test.

Take Care and Have Fun --John


 -------------- Original message ----------------------
From: "Craig Wright" <Craig.Wright () bdo com au>
As for point 1 - what is there to try. A fax is not a modem. There is no
known (even in theory) attack against a fax to gain access.

Regards,
Craig Wright (GSE-Compliance)



Craig Wright
Manager of Information Systems

Direct : +61 2 9286 5497
Craig.Wright () bdo com au
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www.bdo.com.au

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-----Original Message-----

From: listbounce () securityfocus com [mailto:listbounce () securityfocus com]
On Behalf Of jfvanmeter () comcast net
Sent: Tuesday, 30 October 2007 3:21 AM
To: rohnskii () gmail com; security-basics () securityfocus com
Subject: Re: Vulnerability testing in analog modem

I had a similar pen test, it was on a xerox docucentra, I had several
concerns with the multifunction printer

1. there was/is no auditing of the fax connection, so I could try and
try and no one would never know about the attack.
2. the printer also had a web server, so I copied some test file to the
hd and set up my very own web site.

i believe it is possible to break out of the modem connection, via some
type of diagnotic route and get access to the network.

I recommend that to my client that they configure the phone jack for
outgoing calls only., turn off the web server, set passwords, etc. 

I would be interested in hearing anyones thoughts about this. I have a
test coming up for a client on a multi function printer

Take Care and Have Fun --John

 -------------- Original message ----------------------
From: rohnskii () gmail com
I don't know about connecting through the fax to the network but there
is 
another security concern to think about.


Fax machines, and printers, that have an internal HD for document
storage can be 
a security concern.  When the machine is sent out for servicing or
retired there 
may be retrievable document images with confidential information on
them.


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