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Additional info for Cisco Security Intrusion Detection Systems (CSIDS) Student Guide V4.1

Example text

1 Copyright 2004, Cisco Systems, Inc. Management Protocols and Functions The protocols used to manage your network can become a source of vulnerability. This topic examines common management protocols and how they can be exploited. Configuration Management • Configuration management protocols include SSH, SSL, and Telnet. • Telnet issues include the following: – The data within a Telnet session is sent as clear text and may be intercepted by anyone with a packet sniffer located along the data path between the device and the management server.

If hackers cannot mask their identities, they might not attack. Anti-DoS features—Proper configuration of anti-DoS features on routers, firewalls, and IDSs can help limit the effectiveness of an attack. These features often involve limits on the amount of half-open connections that a system allows at any given time. Traffic rate limiting—An organization can implement traffic rate limiting with its ISP. This type of filtering limits the amount of nonessential traffic that crosses network segments at a certain rate.

1—2-52 Regardless of whether SSH, SSL, or Telnet is used for remote access to the managed device, access control lists (ACLs) should be configured to allow only management servers to connect to the device. All attempts from other IP addresses should be denied and logged. RFC 2827 filtering at the ingress router should also be implemented to reduce the chance of an attacker from outside the network spoofing the addresses of the management hosts. 1 Copyright 2004, Cisco Systems, Inc. Management Protocols The following are management protocols that that can be compromised: • SNMP—The community string information for simple authentication is sent in clear text.

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Cisco Security Intrusion Detection Systems (CSIDS) Student Guide V4.1


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