AOS must be configured to prohibit the use of all unnecessary and/or nonsecure functions, ports, protocols, and/or services.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
high	V-266928	SRG-APP-000142-NDM-000245	ARBA-ND-000245	SV-266928r1039805_rule	2024-10-29	1

Description
To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable unused or unnecessary physical and logical ports/protocols on information systems. Network devices 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. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the network device must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved. Some network devices have capabilities enabled by default; if these capabilities are not necessary, they must be disabled. If a particular capability is used, it must be documented and approved.

Description

To prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable unused or unnecessary physical and logical ports/protocols on information systems. Network devices 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. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., email and web services); however, doing so increases risk over limiting the services provided by any one component. To support the requirements and principles of least functionality, the network device must support the organizational requirements providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved. Some network devices have capabilities enabled by default; if these capabilities are not necessary, they must be disabled. If a particular capability is used, it must be documented and approved.

ℹ️ Check
Verify the AOS configuration with the following commands: show firewall-cp show running-config \| include ospf Verify that OSPF is not enabled and only unnecessary and/or nonsecure functions, ports, protocols, and/or services are denied. If OSPF is enabled or any unnecessary and/or nonsecure functions, ports, protocols, and/or services are allowed, this is a finding.

✔️ Fix
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 For any OSPF entries found: no router ospf no router ospf router-id <IP address> no router ospf redistribute vlan <#> no <any other ospf entries> write memory Block any other ports as desired using the following example: configure terminal firewall cp <ipv4/ipv6> deny any proto <ftp, http, telnet, tftp, protocol #> ports <start port 0-65535> <end port 0-65535> exit write memory

✔️ Fix

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 For any OSPF entries found: no router ospf no router ospf router-id <IP address> no router ospf redistribute vlan <#> no <any other ospf entries> write memory Block any other ports as desired using the following example: configure terminal firewall cp <ipv4/ipv6> deny any proto <ftp, http, telnet, tftp, protocol #> ports <start port 0-65535> <end port 0-65535> exit write memory