Cisco Systems Dial NMS Instructions d'exploitation télécharger pdf (Page 21)

Overview of Basic SNMP Building Blocks

About SNMP Security

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Basic Dial NMS Implementation Guide

About SNMP Security

SNMP lacks authentication capabilities, which results in a variety of security threats:

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Masquerading

—An unauthorized entity attempting to perform management operations by

assuming the identity of an authorized management entity.

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Modification of information

—An unauthorized entity attempting to alter a message generated by

an authorized entity, so the message results in unauthorized accounting management or

configuration management operations.

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Message sequence and timing modifications

—Occurs when an unauthorized entity reorders,

delays, or copies and later replays a message generated by an authorized entity.

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Disclosure

—Results when an unauthorized entity extracts values stored in managed objects.

The entity can also learn of notifiable events by monitoring exchanges between managers and

agents.

Note

Because SNMP does not implement authentication, many vendors do not implement

Set

operations, which reduce SNMP to a monitoring facility.

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Cisco Systems Dial NMS Instructions d'exploitation Page 21