RE: fax software in the domain

["Henry, Christopher M." <chenry () radiologycorp com>]

I have been reading through all these posts and I am wondering if this
is not a bit of over kill. I have 3 computers on my network that require
the use of a modem. The only steps I took were 

        1. make sure the app or the PC does not answer calls
        2. In my PBX I only allow out going calls over this line

It would be a pain in ass to try to maintain a second security policy
for these PC and really I don't want to deal with it.  Also to the
outside the modems are invisible so there is really no way for an
attacker to dial in.  Even if you don't have a PBX, as long as nothing
answers the modem line everything be fine, after all what are they going
to do ring your modem to death?




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-----Original Message-----
From: Philip Wagenaar [mailto:p.wagenaar () accon nl] 
Sent: Tuesday, July 27, 2004 3:15 AM
To: security-basics () securityfocus com
Subject: Betr.: RE: fax software in the domain

Hi,

Usually the phone numbers of a company are in the same range, the same
way usually as they IP addressed that they get assigned from their ISP.

An attacker might look up your company's phonenumber and try to dial the
numbers below and above it.

Ie. your company's phonenumber is 555-2345. An attacker might try all
the numbers in the 555-234x range.

You could add an extra layer of security by changing by connecting the
fax to a phoneline with a phonenumber that is not 'near' your company's
phonenumber(s).

So if your company's phonenumber is 555-2345, the faxline would have a
totally diffrent number like 555-8896.



Met vriendelijke groet,

Philip Wagenaar
Junior Projectleider ICT

AccoN Accountants & Adviseurs
ICT Project Bureau
Postbus 5090
6802 EB Arnhem
The Netherlands

tel. +31 (0)26-3842384
fax. +31 (0)26-3630222
mobile: +31 (0)6-25388935
MSN/E-mail: p.wagenaar () accon nl
Yahoo: philip_wagenaar
http://www.accon.nl


> > > "Depp, Dennis M." <deppdm () ornl gov> 26-07-04 19:50 >>>
Ensure the modem is not configured to accept incoming calls.  Also don't
allow bridging or connection sharing on this pc.  I don't know if its
possible to restrict access to ISPs or not.

Dennis


-----Original Message-----
From: Juan B [mailto:juanbabi () yahoo com]
Sent: Saturday, July 24, 2004 6:06 AM
To: security-basics () securityfocus com
Subject: fax software in the domain

Hi,

Im my domain we have w2k servers and the workstations we use xp pro.

On the station of one employee he must use also a fax with a modem
connected to the telefhone line.

I think that this is a security problem.

I cant remove the fax from his pc .my question is what are the steps to
protect this pc from being a security problem to all the network ?

thanks !!




                
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