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CISC-RT-000010 – The Cisco switch must be configured to enforce approved authorizations for controlling the flow of information within the network based on organization-defined information flow control policies.

Details

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, switches, 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).

Solution

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.

SW1(config)#ip access-list extended FILTER_SERVER_TRAFFIC
SW1(config-ext-nacl)#permit tcp any 10.1.12.0 0.0.0.255 eq 515 631 9100
SW1(config-ext-nacl)#permit tcp any 10.1.13.0 0.0.0.255 eq 1433 1434 4022
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#permit ospf any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#interface g0/1
SW1(config-if)#ip access-group FILTER_SERVER_TRAFFIC in
SW1(config-if)#end

Alternate: Inter-VLAN routing

SW1(config)#ip access-list extended FILTER_PRINTER_VLAN
SW1(config-ext-nacl)#permit tcp any any eq lpd 631 9100
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#ip access-list extended FILTER_SQL_VLAN
SW1(config-ext-nacl)#permit tcp any any eq 1433 1434 4022
SW1(config-ext-nacl)#permit icmp any any
SW1(config-ext-nacl)#deny ip any any
SW1(config-ext-nacl)#exit
SW1(config)#interface vlan 12
SW1(config-if)#ip access-group FILTER_PRINTER_VLAN out
SW1(config-if)#exit
SW1(config)#interface vlan 13
SW1(config-if)#ip access-group FILTER_SQL_VLAN out
SW1(config-if)#end

Supportive Information

The following resource is also helpful.

This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Cisco.

References

Source

Updated on July 16, 2022
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