IT Baseline Protection Manual - The Information Warfare Site

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Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... - identification and authentication of the operator; - disconnection in case of critical security incidents; - automatic call back; and - logging of all activities. In addition, other functions can be implemented as well: - Activation of a time lock on invalid access attempts. - De-activation of remote maintenance during normal operation and explicit release for a clearly defined period of time. This is an expedient measure which, in an emergency, will enable the manufacturer or another service contractor to intervene. - Restrictions on the rights of maintenance staff. By means of additional software installed on the service PC, the users' scope for action can be restricted in order to achieve gradation of the administration of rights. - "Forced log-out" in case of line interruption. If the connection between the remote-maintenance unit and the PC gateway is interrupted in any way, access to the system must be stopped by a "forced log-out". Physical de-activation of the remote-maintenance ports If remote maintenance is normally not required and is to be provided only if required, physical shut-off of the port is recommended. If required, it can be re-activated at short notice, possibly after consultation over the telephone with the manufacturer or the service contractor. Closed User Group (CUG) It is possible to create a CUG in public ISDN and X.25 networks. Here, the network operator provides the user with a virtual "network within a network". The closed user groups can be obtained from the network operator against the appropriate fee. Alternatively, it can be considered realising the closed user groups by using the ISDN Calling Line Identification and Presentation (CLIP) and Connected Line Identification and Presentation (COLP). If possible, this can also be done by appropriately configuring the PBX system or the PC gateway. Avoiding or controlling direct dial-in Direct dial-in, e.g. from other networks by suffix dialling in dual tone multifrequency signalling, into the PBX system should be disabled, if possible. This is often used for access to server services. If it is not possible to prevent direct dial-in, it is recommended to activate all available protective mechanisms and regular controls to detect possible abuse. ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
Safeguard Catalogue - Communications Remarks ____________________________________________________________________ ......................................... Additional controls: - Is remote maintenance normally physically de-activated? - From where can remote maintenance be performed? - Is a call-back procedure installed? - Has a PC gateway been implemented? - Are the inputs made via remote maintenance logged? - Is access to the protocol files provided for remote maintenance? - Is it possible to de-activate the logging printer through remote maintenance? - Are invalid log-in attempts logged? - Is the connection terminated after such attempts? - Is an automatic log-out effected on line interruption? ____________________________________________________________________ ......................................... IT-Baseline Protection Manual: Oktober 2000
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