IT Baseline Protection Manual - The Information Warfare Site

Threats Catalogue Deliberate Acts Remarks
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T 5.34 Deliberate re-programming of the destination
keys on fax machines
To avoid the repetetive input of recurring fax numbers, some fax machines are
equipped with programmable destination keys. During the transmission of fax
messages to such recipients, the stored destination number is usually not
checked. If unauthorised persons are able to re-program the destination keys
and promptly forward the fax messages arriving at the new destination to the
correct recipient, all fax traffic along this route can be monitored easily,
perhaps without ever being detected.
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IT-Baseline Protection Manual: Oktober 2000