The Cisco router must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216641	CISC-RT-000010	SV-216641r531086_rule		Medium

Description
Information flow control regulates where information is allowed to travel within a network and between interconnected networks. The flow of all network traffic must be monitored and controlled so it does not introduce any unacceptable risk to the network infrastructure or data. Information flow control policies and enforcement mechanisms are commonly employed by organizations to control the flow of information between designated sources and destinations (e.g., networks, individuals, and devices) within information systems. Enforcement occurs, for example, in boundary protection devices (e.g., gateways, routers, guards, encrypted tunnels, and firewalls) that employ rule sets or establish configuration settings that restrict information system services, provide a packet-filtering capability based on header information, or provide a message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics).

Description

Information flow control regulates where information is allowed to travel within a network and between interconnected networks. The flow of all network traffic must be monitored and controlled so it does not introduce any unacceptable risk to the network infrastructure or data. Information flow control policies and enforcement mechanisms are commonly employed by organizations to control the flow of information between designated sources and destinations (e.g., networks, individuals, and devices) within information systems. Enforcement occurs, for example, in boundary protection devices (e.g., gateways, routers, guards, encrypted tunnels, and firewalls) that employ rule sets or establish configuration settings that restrict information system services, provide a packet-filtering capability based on header information, or provide a message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics).

STIG	Date
Cisco IOS XE Router RTR Security Technical Implementation Guide	2021-09-16

Details

Check Text ( C-17874r287889_chk )
This requirement is not applicable for the DODIN Backbone. Review the router configuration to verify that Access Control Lists (ACLs) are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols. For example, the configuration below will allow only printer traffic into subnet 10.1.23.0/24 and SQL traffic into subnet 10.1.24.0/24. ICMP is allowed for troubleshooting and OSPF is the routing protocol used within the network. interface GigabitEthernet1/1 description link to core ip address 10.1.12.2 255.255.255.0 ip access-group FILTER_SERVER_TRAFFIC in … … … ip access-list extended FILTER_SERVER_TRAFFIC permit tcp any 10.1.23.0 0.0.0.255 eq lpd 631 9100 permit tcp any 10.1.24.0 0.0.0.255 eq 1433 1434 4022 permit icmp any any permit ospf any any deny ip any any If the router is not configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies, this is a finding.

Check Text ( C-17874r287889_chk )

This requirement is not applicable for the DODIN Backbone.

Review the router configuration to verify that Access Control Lists (ACLs) are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols. For example, the configuration below will allow only printer traffic into subnet 10.1.23.0/24 and SQL traffic into subnet 10.1.24.0/24. ICMP is allowed for troubleshooting and OSPF is the routing protocol used within the network.

interface GigabitEthernet1/1
description link to core
ip address 10.1.12.2 255.255.255.0
ip access-group FILTER_SERVER_TRAFFIC in
…
…
…
ip access-list extended FILTER_SERVER_TRAFFIC
permit tcp any 10.1.23.0 0.0.0.255 eq lpd 631 9100
permit tcp any 10.1.24.0 0.0.0.255 eq 1433 1434 4022
permit icmp any any
permit ospf any any
deny ip any any

If the router is not configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies, this is a finding.

Fix Text (F-17872r287890_fix)
This requirement is not applicable for the DODIN Backbone. Configure ACLs to allow or deny traffic for specific source and destination addresses as well as ports and protocols between various subnets as required. The commands used below were used to create the configuration as shown in the check content. R5(config)#ip access-list extended FILTER_SERVER_TRAFFIC R5(config-ext-nacl)#permit tcp any x101.23.0 0.0.0.255 eq 515 631 9100 R5(config-ext-nacl)#permit tcp any 10.1.24.0 0.0.0.255 eq 1433 1434 4022 R5(config-ext-nacl)#permit icmp any any R5(config-ext-nacl)#permit ospf any any R5(config-ext-nacl)#deny ip any any R5(config-ext-nacl)#exit R5(config)#interface GigabitEthernet1/1 R5(config-if)#ip access-group FILTER_SERVER_TRAFFIC in

Fix Text (F-17872r287890_fix)

This requirement is not applicable for the DODIN Backbone.

Configure ACLs to allow or deny traffic for specific source and destination addresses as well as ports and protocols between various subnets as required. The commands used below were used to create the configuration as shown in the check content.

R5(config)#ip access-list extended FILTER_SERVER_TRAFFIC
R5(config-ext-nacl)#permit tcp any x101.23.0 0.0.0.255 eq 515 631 9100
R5(config-ext-nacl)#permit tcp any 10.1.24.0 0.0.0.255 eq 1433 1434 4022
R5(config-ext-nacl)#permit icmp any any
R5(config-ext-nacl)#permit ospf any any
R5(config-ext-nacl)#deny ip any any
R5(config-ext-nacl)#exit
R5(config)#interface GigabitEthernet1/1
R5(config-if)#ip access-group FILTER_SERVER_TRAFFIC in