Check: CISC-RT-000391
Cisco IOS XE Router RTR STIG:
CISC-RT-000391
(in versions v2 r9 through v2 r2)
Title
The Cisco perimeter router must be configured to suppress Router Advertisements on all external IPv6-enabled interfaces. (Cat II impact)
Discussion
Many of the known attacks in stateless autoconfiguration are defined in RFC 3756 were present in IPv4 ARP attacks. To mitigate these vulnerabilities, links that have no hosts connected such as the interface connecting to external gateways must be configured to suppress router advertisements.
Check Content
This requirement is not applicable for the DoDIN Backbone. Review the router configuration to verify that Router Advertisements are suppressed on all external IPv6-enabled interfaces as shown in the example below. interface gigabitethernet1/0 ipv6 address 2001::1:0:22/64 ipv6 nd ra suppress If the router is not configured to suppress Router Advertisements on all external IPv6-enabled interfaces, this is a finding.
Fix Text
Configure the router to suppress Router Advertisements on all external IPv6-enabled interfaces as shown in the example below. R1(config)#int g1/0 R1(config-if)#ipv6 nd ra suppress R1(config-if)#end
Additional Identifiers
Rule ID: SV-230045r647430_rule
Vulnerability ID: V-230045
Group Title: SRG-NET-000512-RTR-000014
Expert Comments
CCIs
Number | Definition |
---|---|
CCI-000366 |
The organization implements the security configuration settings. |
Controls
Number | Title |
---|---|
CM-6 |
Configuration Settings |