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CISC-RT-000440 - The Cisco out-of-band management (OOBM) gateway router must be configured to block any traffic destined to itself that is not sourced from the OOBM network or the Network Operations Center (NOC).

Information

If the gateway router is not a dedicated device for the OOBM network, several safeguards must be implemented for containment of management and production traffic boundaries. It is imperative that hosts from the managed network are not able to access the OOBM gateway router.

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

Solution

This requirement is not applicable for the DODIN Backbone. It is only applicable if the OOBM gateway router is not a dedicated device to the OOBM backbone.

Step 1: Configure the ACL to only allow traffic to the route processor from the OOBM backbone and the NOC.

RP/0/0/CPU0:R2(config)#ipv4 access-list TRAFFIC_FROM_NOC
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.11.1.0 0.255.255.255 host 10.11.$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.12.1.0 0.255.255.255 host 10.11.$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.11.1.0 0.255.255.255 host 10.13.$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.12.1.0 0.255.255.255 host 10.13.$
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any host 10.11.1.8 log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any host 10.13.1.1 log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.11.1.0 0.0.0.255 10.13.1.0 0.0.0$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.12.1.0 0.0.0.255 10.13.1.0 0.0.0$
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any any log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#exit

Step 2: Configure the ACL to only allow traffic to the route processor from the OOBM LAN.

RP/0/0/CPU0:R2(config)#ipv4 access-list TRAFFIC_TO_NOC
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.13.1.0 0.255.255.255 host 10.13.$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.13.1.0 0.255.255.255 host 10.11.$
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any host 10.13.1.1 log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any host 10.11.1.8 log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.13.1.0 0.255.255.255 10.11.1.0 0$
RP/0/0/CPU0:R2(config-ipv4-acl)#permit ip 10.13.1.0 0.255.255.255 10.12.1.0 0$
RP/0/0/CPU0:R2(config-ipv4-acl)#deny ip any any log-input
RP/0/0/CPU0:R2(config-ipv4-acl)#exit

Step 3: Apply the ACLs configured above to the appropriate OOBM interfaces as shown in the example below.

RP/0/0/CPU0:R2(config)#int g0/0/0/2
RP/0/0/CPU0:R2(config-if)#ipv4 access-group TRAFFIC_FROM_NOC in
RP/0/0/CPU0:R2(config)#int g0/0/0/3
RP/0/0/CPU0:R2(config-if)#access-group TRAFFIC_TO_NOC in
RP/0/0/CPU0:R2(config-if)#end

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Cisco_NX-OS_Switch_Y24M10_STIG.zip

Item Details

Category: SYSTEM AND COMMUNICATIONS PROTECTION

References: 800-53|SC-7a., CAT|II, CCI|CCI-001097, Rule-ID|SV-216772r531087_rule, STIG-ID|CISC-RT-000440, STIG-Legacy|SV-105889, STIG-Legacy|V-96751, Vuln-ID|V-216772

Plugin: Cisco

Control ID: f657450be61dccabf2ef2bef84248c22f10c475e32a56688a723f31dac7b76d3