Rule ID
SV-266577r1040221_rule
Version
V1R2
CCIs
CCI-000381
It is detrimental for network elements to provide, or enable by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Network elements are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions and functions).
Verify the AOS configuration with the following command: show firewall-cp Verify that nonessential capabilities, functions, ports, protocols, and/or services are denied. If any nonessential capabilities, functions, ports, protocols, and/or services are allowed, this is a finding.
Configure AOS with the following commands: configure terminal firewall cp ipv4 deny any proto 6 ports 17 17 ipv4 deny any proto 6 ports 8080 8080 ipv4 deny any proto 6 ports 8081 8081 ipv4 deny any proto 6 ports 8082 8082 ipv4 deny any proto 6 ports 8088 8088 ipv6 deny any proto 6 ports 17 17 ipv6 deny any proto 6 ports 8080 8080 ipv6 deny any proto 6 ports 8081 8081 ipv6 deny any proto 6 ports 8082 8082 ipv6 deny any proto 6 ports 8088 8088 exit write memory Block any other ports as desired using the following example: <ipv4/ipv6> deny any proto <ftp, http, telnet, tftp, protocol #> ports <start port 0-65535> <end port 0-65535>