Detections
Analytics

1.9 CISC-RT-000180

Information

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

GROUP ID: V-216656
RULE ID: SV-216656r855817

The ICMP supports IP traffic by relaying information about paths, routes, and network conditions. Routers 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:

R4(config)#int g0/1
R4(config-if)#no ip mask-reply

See Also

https://workbench.cisecurity.org/benchmarks/26261

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-216656r855817_rule, STIG-ID|CISC-RT-000180, Vuln-ID|V-216656

Plugin: Cisco

Control ID: 048f152d4dc66c3f86ee2376938fc93fdc76ee732281f7d206f97328dbaa702d