The Cisco router must be configured to be configured to prohibit the use of all unnecessary and nonsecure functions and services.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216529	CISC-ND-000470	SV-216529r531088_rule		High

Description
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, then it must be documented and approved.

Description

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, then it must be documented and approved.

STIG	Date
Cisco IOS XR Router NDM Security Technical Implementation Guide	2020-09-23

Details

Check Text ( C-17764r288273_chk )
Verify that the router does not have any unnecessary or non-secure ports, protocols and services enabled. For example, the following commands should not be in the configuration: service ipv4 tcp-small-servers max-servers 10 service ipv4 udp-small-servers max-servers 10 http client vrf xxxxx telnet vrf default ipv4 server max-servers 1 If any unnecessary or non-secure ports, protocols, or services are enabled, this is a finding.

Check Text ( C-17764r288273_chk )

Verify that the router does not have any unnecessary or non-secure ports, protocols and services enabled. For example, the following commands should not be in the configuration:

service ipv4 tcp-small-servers max-servers 10
service ipv4 udp-small-servers max-servers 10
http client vrf xxxxx
telnet vrf default ipv4 server max-servers 1

If any unnecessary or non-secure ports, protocols, or services are enabled, this is a finding.

Fix Text (F-17761r288274_fix)
Disable the following services if enabled as shown in the example below. RP/0/0/CPU0:R3(config)#no service ipv4 tcp-small-servers RP/0/0/CPU0:R3(config)#no service ipv4 udp-small-servers RP/0/0/CPU0:R3(config)#no http client vrf xxxxx RP/0/0/CPU0:R3(config)#no telnet ipv4 server