The Cisco out-of-band management (OOBM) gateway router must be configured to forward only authorized management traffic to the Network Operations Center (NOC).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216589	CISC-RT-000410	SV-216589r531085_rule		Medium

Description
The OOBM network is an IP network used exclusively for the transport of OAM&P data from the network being managed to the OSS components located at the NOC. Its design provides connectivity to each managed network device, enabling network management traffic to flow between the managed network elements and the NOC. This allows the use of paths separate from those used by the managed network.

STIG	Date
Cisco IOS Router RTR Security Technical Implementation Guide	2022-09-14

Details

Check Text ( C-17824r287145_chk )

This requirement is not applicable for the DODIN Backbone. Review the network topology diagram to determine connectivity between the managed network and the NOC. Review the OOBM gateway router configuration to validate the path that the management traffic traverses. Verify that only management traffic is forwarded through the OOBM interface or IPsec tunnel. If an OOBM link is used, verify that the only authorized management traffic is transported to the NOC by reviewing the outbound ACL applied to the OOBM interface as shown in the example below. Step 1: Note the outbound ACL applied to the OOBM interface. interface GigabitEthernet0/2 description OOB link to NOC ip address 10.11.1.8 255.255.255.0 ip access-group MGMT_TRAFFIC_ACL out Step 2: Review the outbound ACL and verify only management traffic is forwarded to the NOC. ip access-list extended MGMT_TRAFFIC_ACL permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq 22 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp-trap permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 deny ip any any log-input If an IPSec tunnel is used, verify that the only authorized management traffic is transported to the NOC. Step 1: Note the crypto map applied to the external interface. interface interface GigabitEthernet0/2 description link to DISN ip address x.1.24.4 255.255.255.0 crypto map IPSEC_MGMT_MAP Step 2: Review the crypto map that was bound to the external interface and note the ACL defined that identifies the interesting traffic for the IPsec tunnel. crypto map IPSEC_MGMT_MAP 10 ipsec-isakmp set peer x.1.12.1 set transform-set TRANS_SET match address MGMT_TRAFFIC_ACL Step 3: Review the ACL defined in the crypto map and verify only management traffic is forwarded to the NOC. ip access-list extended MGMT_TRAFFIC_ACL permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq 22 permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp-trap permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 Note: ICMP is permitted for troubleshooting purposes. The IPSec SA can only identify interesting traffic via address, protocol, and port; hence, the ICMP traffic cannot be qualified via type attribute. If traffic other than authorized management traffic is permitted through the OOBM interface or IPsec tunnel, this is a finding.

Fix Text (F-17820r287146_fix)

This requirement is not applicable for the DODIN Backbone. Configure ACLs to permit only authorized management traffic into IPsec tunnels or the OOBM interface used for forwarding management data as shown in the examples below. OOBM Link R4(config)#ip access-list extended MGMT_TRAFFIC_ACL R4(config-ext-nacl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs R4(config-ext-nacl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq 22 R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp-trap R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog R4(config-ext-nacl)#permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 echo R4(config-ext-nacl)#permit icmp 10.1.34.0 0.0.0.255 10.22.22.0 0.0.0.255 echo-reply R4(config-ext-nacl)#deny ip any any log-input R4(config-ext-nacl)#exit IPsec Tunnel R4(config)#ip access-list extended MGMT_TRAFFIC_ACL R4(config-ext-nacl)#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq tacacs R4(config-ext-nacl#permit tcp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq 22 R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq snmp-trap R4(config-ext-nacl)#permit udp 10.1.34.0 0.0.0.255 10.22.2.0 0.0.0.255 eq syslog R4(config-ext-nacl)#permit icmp 10.1.34.0 0.0.0.255 22.22.22.0 0.0.0.255 R4(config-ext-nacl)#exit