The Cisco switch must be configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-220479 | CISC-ND-000140 | SV-220479r991956_rule | CCI-001368 | medium |
| Description | ||||
| 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. | ||||
| STIG | Date | |||
| Cisco NX OS Switch NDM Security Technical Implementation Guide | 2025-05-19 | |||
Details
Check Text (C-220479r991956_chk)
Review the Cisco switch configuration to verify that it is compliant with this requirement.
Step 1: Verify that the line vty has an ACL inbound applied as shown in the example below:
line vty
access-class MGMT_NET in
Step 2: Verify that the ACL permits only hosts from the management network to access the switch.
ip access-list MGMT_NET
10 permit ip 10.1.48.0/24 any
20 deny ip any any log
NX-OS v8 and later example:
Step 1: Verify that an ACL has been applied to the management interface inbound as shown in the example below:
interface mgmt0
ip access-group MGMT_NET in
Step 2: Verify that the ACL permits only hosts from the management network to access the switch.
ip access-list MGMT_NET
10 permit ip 10.1.48.0/24 any
20 deny ip any any log
If the Cisco switch is not configured to enforce approved authorizations for controlling the flow of management information within the device based on control policies, this is a finding.
Fix Text (F-22183r991955_fix)
Configure the Cisco switch to restrict management access to specific IP addresses as shown in the example below:
SW1(config)# ip access-list MGMT_NET
SW1(config-acl)# permit ip 10.1.48.0/24 any
SW1(config-acl)# deny ip any any log
SW1(config-acl)# exit
SW1(config)# line vty
SW1(config-line)# access-class MGMT_NET in
SW1(config-acl)# end
NX-OS v8 and later example:
SW1(config)# ip access-list MGMT_NET
SW1(config-acl)# permit ip 10.1.48.0/24 any
SW1(config-acl)# deny ip any any log
SW1(config-acl)# exit
SW1(config)# interface mgmt0
SW1(config-if)# ip access-group MGMT_NET in
SW1(config-acl)# end