Cisco IOS XR Router RTR STIG Version Comparison

There are 3 differences between versions v2 r4 (Oct. 25, 2023) (the "left" version) and v3 r2 (Oct. 24, 2024) (the "right" version).

Check CISC-RT-000010 was changed between these two versions. Green, underlined text was added, red, struck-out text was removed.

The regular view of the left check and right check may be easier to read.

Title

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.

Check Content

This requirement is not applicable for the DODIN Backbone. Review Backbone. If Virtual Routing and Forwarding (VRF) is used to segment traffic and force traffic to traverse through next generation firewalls with ACLs, this requirement is not applicable. Review the router configuration to verify that 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 GigabitEthernet0/0/0/0 description link to core ipv4 address 10.1.12.2 255.255.255.0 ipv4 access-group FILTER_SERVER_TRAFFIC ingress … … … ipv4 access-list FILTER_SERVER_TRAFFIC 10 permit tcp any 10.1.23.0 0.0.0.255 eq lpd 20 permit tcp any 10.1.23.0 0.0.0.255 eq 631 30 permit tcp any 10.1.23.0 0.0.0.255 eq 9100 40 permit tcp any 10.1.24.0 0.0.0.255 eq 1433 50 permit tcp any 10.1.24.0 0.0.0.255 eq 1434 60 permit tcp any 10.1.24.0 0.0.0.255 eq 4022 70 permit icmp any any 80 permit ospf any any 90 deny ipv4 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.

Discussion

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).

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. RP/0/0/CPU0:R2(config)#ipv4 access-list FILTER_SERVER_TRAFFIC RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.23.0 0.0.0.255 eq lpd RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.23.0 0.0.0.255 eq 631 RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.23.0 0.0.0.255 eq 9100 RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.24.0 0.0.0.255 eq 1433 RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.24.0 0.0.0.255 eq 1434 RP/0/0/CPU0:R2(config-ipv4-acl)#permit tcp any 10.1.24.0 0.0.0.255 eq 4022 RP/0/0/CPU0:R2(config-ipv4-acl)#permit icmp any any RP/0/0/CPU0:R2(config-ipv4-acl)#permit ospf any any RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any any RP/0/0/CPU0:R2(config-ipv4-acl)# RP/0/0/CPU0:R2(config-ipv4-acl)#exit RP/0/0/CPU0:R2(config)#int g0/0/0/0 RP/0/0/CPU0:R2(config-if)#ipv4 access-group FILTER_SERVER_TRAFFIC