IT Baseline Protection Manual - The Information Warfare Site

Threats Catalogue Deliberate Acts Remarks
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T 5.63 Manipulation via the ISDN D-channel
The sum of all physical links between a subscriber and a digital exchange
assigned to that subscriber is termed connection network. Such a connection
network contains numerous distributors and transfer points, some of which are
freely accessible and unprotected to a large extent (e.g. cable distributors). In
the simplest case, communications with the connection network can be
disrupted by mechanical damage to a connection line.
Furthermore, an ISDN protocol analyser allows communicated messages to be
recorded and evaluated. If a protocol analyser is looped into the
communications circuit, it also allows the manipulation of control information
on the D-channel of the ISDN network. The communications components of
the affected subscriber (i.e. ISDN cards, ISDN routers, telecommunications
facilities, etc) might thus respond in a manner which impairs their operation or
the integrity of the stored data.
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IT-Baseline Protection Manual: Oktober 2000