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.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-221071 | CISC-RT-000010 | SV-221071r622190_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, 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). |
| STIG | Date |
|---|---|
| Cisco NX-OS Switch RTR Security Technical Implementation Guide | 2021-03-29 |
Details
| Check Text ( C-22786r409702_chk ) |
|---|
| Review the switch 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 10.1.12.0/24 and SQL traffic into subnet 10.1.13.0/24. ICMP is allowed for troubleshooting and OSPF is the routing protocol used within the network. interface Ethernet2/3 no switchport ip access-group FILTER_SERVER_TRAFFIC in ip address 10.1.23.2/24 no shutdown … … … ip access-list FILTER_SERVER_TRAFFIC 10 permit tcp any 10.1.12.0/24 eq lpd 20 permit tcp any 10.1.12.0/24 eq 631 30 permit tcp any 10.1.12.0/24 eq 9100 40 permit tcp any 10.1.13.0/24 eq 1433 50 permit tcp any 10.1.13.0/24 eq 1434 60 permit tcp any 10.1.13.0/24 eq 4022 70 permit icmp any any 80 permit ospf any any 90 deny ip any any Alternate: Inter-VLAN routing interface Vlan12 ip address 10.1.12.1 255.255.255.0 ip access-group FILTER_PRINTER_VLAN out ! interface Vlan13 ip address 10.1.13.1 255.255.255.0 ip access-group FILTER_SQL_VLAN out … … … ip access-list FILTER_PRINTER_VLAN 10 permit tcp any any eq lpd 20 permit tcp any any eq 631 30 permit tcp any any eq 9100 40 permit icmp any any 50 deny ip any any ip access-list FILTER_SQL_VLAN 10 permit tcp any any eq 1433 20 permit tcp any any eq 1434 30 permit tcp any any eq 4033 40 permit icmp any any 50 deny ip any any If the switch 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-22775r409703_fix) |
|---|
| 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 FILTER_SERVER_TRAFFIC SW1(config-acl)# permit tcp any 10.1.12.0 0.0.0.255 eq lpd SW1(config-acl)# permit tcp any 10.1.12.0 0.0.0.255 eq 631 SW1(config-acl)# permit tcp any 10.1.12.0 0.0.0.255 eq 9100 SW1(config-acl)# permit tcp any 10.1.13.0 0.0.0.255 eq 1433 SW1(config-acl)# permit tcp any 10.1.13.0 0.0.0.255 eq 1434 SW1(config-acl)# permit tcp any 10.1.13.0 0.0.0.255 eq 4022 SW1(config-acl)# permit icmp any any SW1(config-acl)# permit ospf any any SW1(config-acl)# deny ip any any SW1(config-acl)# exit SW1(config)# int e2/3 SW1(config-if)# ip access-group FILTER_SERVER_TRAFFIC in SW1(config-if)# end Alternate: Inter-VLAN routing SW1(config)# ip access-list FILTER_PRINTER_VLAN SW1(config-acl)# permit tcp any any eq lpd SW1(config-acl)# permit tcp any any eq 631 SW1(config-acl)# permit tcp any any eq 9100 SW1(config-acl)# permit icmp any any SW1(config-acl)# deny ip any any SW1(config-acl)# exit SW1(config)# ip access-list FILTER_SQL_VLAN SW1(config-acl)# permit tcp any any eq 1433 SW1(config-acl)# permit tcp any any eq 1434 SW1(config-acl)# permit tcp any any eq 4033 SW1(config-acl)# permit icmp any any SW1(config-acl)# deny ip any any SW1(config-acl)# exit SW1(config)# int vlan 12 SW1(config-if)# ip access-group FILTER_PRINTER_VLAN out SW1(config-if)# exit SW1(config)# int vlan 13 SW1(config-if)# ip access-group FILTER_SQL_VLAN out SW1(config-if)# end |