The Cisco IOS XE router must be configured to prohibit the use of all unnecessary or non-secure ports, protocols, or services.

From Cisco IOS XE Release 3 NDM Security Technical Implementation Guide

Part of SRG-APP-000142-NDM-000245

Associated with: CCI-000382

SV-88681r3_rule The Cisco IOS XE router must be configured to prohibit the use of all unnecessary or non-secure ports, protocols, or services.

Vulnerability discussion

In order 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, then it must be documented and approved.

Check content

Verify that the Cisco IOS XE 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: ip bootp server ip dns server ip finger ip http server ip identd ip rcmd rcp-enable ip rcmd rsh-enable service config service finger service tcp-small-servers service udp-small-servers service pad transport input telnet transport output telnet If any unnecessary or non-secure ports, protocols or services are enabled, this is a finding.

Fix text

Disable all unnecessary or non-secure ports, protocols, and services. If any of the following commands are in the configuration, remove them. ip bootp server ip dns server ip identd ip finger ip http-server ip rcmd rcp-enable ip rcmd rsh-enable service config service fingerDisable all unnecessary or non-secure ports, protocols and services. no ip bootp server no ip dns server no ip finger no ip http server no ip identd no ip rcmd rcp-enable no ip rcmd rsh-enable no service config no service udp-small-servers no service tcp-small-servers no service finger no service pad line vty 0 4 no transport input no transport output transport input ssh transport output ssh Note: transport input and output for telnet service can’t be disabled individually; hence, ssh must be reinserted for access to the line vty configuration. service tcp-small-servers service udp-small-servers service pad

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