Detections
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1.26 CISC-RT-000390

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Information

The Cisco perimeter switch must be configured to block all outbound management traffic.

GROUP ID: V-221099
RULE ID: SV-221099r999708

For in-band management, the management network must have its own subnet in order to enforce control and access boundaries provided by Layer 3 network nodes, such as switches and firewalls. Management traffic between the managed network elements and the management network is routed via the same links and nodes as that used for production or operational traffic. Safeguards must be implemented to ensure that the management traffic does not leak past the perimeter of the managed network.

NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.

Solution

Configure the perimeter switch of the managed network with an outbound ACL on the egress interface to block all management traffic.

Step 1 : Configure an ACL to block egress management traffic.

SW1(config)# ip access-list EXTERNAL_ACL_OUTBOUND
SW1(config-acl)# deny tcp any any eq tacacs log
SW1(config-acl)# deny tcp any any eq 22 log
SW1(config-acl)# deny udp any any eq snmp log
SW1(config-acl)# deny udp any any eq snmptrap log
SW1(config-acl)# deny udp any any eq syslog log
SW1(config-acl)# permit tcp any any eq www
SW1(config-acl)# deny ip any any log
SW1(config-acl)# exit

Note: Permit commands would be configured to allow applicable outbound traffic. The example above is allowing web traffic.

Step 2 : Configure the external interfaces with the outbound ACL.

SW1(config)#int e2/2
SW1(config-if)# ip access-group EXTERNAL_ACL_OUTBOUND out

See Also

https://workbench.cisecurity.org/benchmarks/22581

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7a., CAT|II, CSCv7|14.6, Rule-ID|SV-221099r999708_rule, STIG-ID|CISC-RT-000390, Vuln-ID|V-221099

Plugin: Cisco

Control ID: 7cfcbc43a6c94c998e9dfe3579ef0baf13e55c12b71e2139f6f1da6b19592310