Title

The Cisco router must be configured to be configured to prohibit the use of all unnecessary and nonsecure functions and services. (Cat I impact)

Discussion

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.

Check Content

Verify that the router does not have any unnecessary or nonsecure 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 service call-home If any unnecessary or nonsecure ports, protocols, or services are enabled, this is a finding.

Fix Text

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 RP/0/0/CPU0:R3(config)#no service call-home

Additional Identifiers

Rule ID: SV-216529r960966_rule

Vulnerability ID: V-216529

Group Title: SRG-APP-000142-NDM-000245

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.