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-216747RULE ID: SV-216747r856438

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 ipv4 mask-reply on all external interfaces as shown below.

RP/0/0/CPU0:R3(config)#int g0/0/0/1RP/0/0/CPU0:R3(config-if)#no ipv4 mask-reply

See Also

https://workbench.cisecurity.org/benchmarks/23599

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-5, CAT|II, CCI|CCI-002385, Rule-ID|SV-216747r856438_rule, STIG-ID|CISC-RT-000180, Vuln-ID|V-216747

Plugin: Cisco

Control ID: acfea69135e9c94f6c74eccf69d50fc3ce681822f5285e233722bf7574550f89