Rule ID
SV-273569r1110905_rule
Version
V1R1
CCIs
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 how 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).
This requirement is not applicable for the DODIN Backbone. Review the router configuration to verify that access control lists (ACLs) and filters are configured to allow or deny traffic for specific source and destination addresses as well as ports and protocols. In this example, SSL traffic is permitted to a specific internal host. interface ethernet 1/1/10 port-name Link_to_DISN ip address x.12.1.10 255.255.255.0 ip access-group Filter_Perimeter in ! ip access-list extended Filter_Perimeter sequence 10 permit tcp any any established sequence 20 permit tcp host x.12.1.9 host x.12.1.10 eq bgp sequence 30 permit tcp host x.12.1.9 eq bgp host x.12.1.10 sequence 40 permit icmp host x.12.1.9 host x.12.1.10 echo sequence 50 permit icmp host x.12.1.9 host x.12.1.10 echo-reply sequence 60 permit tcp any host x.12.1.22 eq ssl sequence 70 deny ip any any log 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.
This requirement is not applicable for the DODIN Backbone. Configure ACLs and filters to allow or deny traffic for specific source and destination addresses as well as ports and protocols. 1. Configure access-list filter to control flow of information between interconnected networks in accordance with appliable policy. In this example, SSL traffic is permitted to a specific internal host. ip access-list extended Filter_Perimeter sequence 10 permit tcp any any established sequence 20 permit tcp host x.12.1.9 host x.12.1.10 eq bgp sequence 30 permit tcp host x.12.1.9 eq bgp host x.12.1.10 sequence 40 permit icmp host x.12.1.9 host x.12.1.10 echo sequence 50 permit icmp host x.12.1.9 host x.12.1.10 echo-reply sequence 60 permit tcp any host x.12.1.22 eq ssl sequence 70 deny ip any any log 2. Apply access list to external interface. interface ethernet 1/1/10 port-name Link_to_DISN ip address x.12.1.10 255.255.255.0 ip access-group Filter_Perimeter in !