Detections
Analytics

1.9 CISC-RT-000180

Information

The Cisco switch must be configured to have Internet Control Message Protocol (ICMP) mask reply messages disabled on all external interfaces.

GROUP ID: V-221001
RULE ID: SV-221001r856406

The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Switches automatically send ICMP messages under a wide variety of conditions. Mask Reply ICMP messages are commonly used by attackers for network mapping and diagnosis.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Disable ip mask-reply on all external interfaces as shown below:

SW1(config)#int g0/1
SW1(config-if)#no ip mask-reply

See Also

https://workbench.cisecurity.org/benchmarks/26260

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-221001r856406_rule, STIG-ID|CISC-RT-000180, Vuln-ID|V-221001

Plugin: Cisco

Control ID: 5b34df4de7546e0358703e6af268c5cbcfc01624e027b822bd09e9dab0365b86