The Cisco ISR 4000 Series router must enforce approved authorizations for controlling the flow of management information within the router based on information flow control policies.

From Cisco IOS XE Release 3 NDM Security Technical Implementation Guide

Part of SRG-APP-000038-NDM-000213

Associated with: CCI-001368

SV-88645r1_rule The Cisco ISR 4000 Series router must enforce approved authorizations for controlling the flow of management information within the router based on information flow control policies.

Vulnerability discussion

A mechanism to detect and prevent unauthorized communication flow must be configured or provided as part of the system design. If management information flow is not enforced based on approved authorizations, the network device may become compromised. Information flow control regulates where management information is allowed to travel within a network device. The flow of all management information must be monitored and controlled so it does not introduce any unacceptable risk to the network device or data. Application-specific examples of enforcement occur in systems that employ rule sets or establish configuration settings that restrict information system services or message-filtering capability based on message content (e.g., implementing key word searches or using document characteristics).Applications providing information flow control must be able to enforce approved authorizations for controlling the flow of management information within the system in accordance with applicable policy.

Check content

Verify that the Cisco ISR 4000 Series router has ACLs configured and apply to the appropriate interfaces to control the flow of traffic. The configuration should look similar to the example below: interface GigabitEthernet 0/0/1 description MGMT link ip address x.x.x.x 255.255.255.0 ip access-group Authorized_Sources_ACL in ... Extended IP access list Authorized_Source_ACL 10 permit 22 host 2.2.2.2 host 3.3.3.3 log 20 deny ip any any log If ACLs are not configured, this is a finding.

Fix text

Configure the Cisco ISR 4000 Series router with ACLs, applied to the appropriate interfaces to control the flow of management information. The configuration should look similar to the example below: interface GigabitEthernet 0/0/1 description MGMT link ip address x.x.x.x 255.255.255.0 ip access-group Authorized_Sources_ACL in ... Extended IP access list Authorized_Source_ACL 10 permit 22 host 2.2.2.2 host 3.3.3.3 log 20 deny ip any any log

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