Check: CISC-RT-000391
Cisco NX OS Switch RTR STIG:
CISC-RT-000391
(in versions v2 r3 through v2 r1)
Title
The Cisco perimeter switch 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
Review the switch configuration to verify that Router Advertisements are suppressed on all external IPv6-enabled interfaces as shown in the example below. interface Ethernet1/1 no switchport ipv6 address 2001::1:24:3/64 ipv6 nd suppress-ra no shutdown If the switch is not configured to suppress Router Advertisements on all external IPv6-enabled interfaces, this is a finding.
Fix Text
Configure the switch to suppress Router Advertisements on all external IPv6-enabled interfaces as shown in the example below. SW1(config)# interface e1/1 SW1(config-if-range)# ipv6 nd suppress-ra SW1(config-if-range)# end
Additional Identifiers
Rule ID: SV-237760r648795_rule
Vulnerability ID: V-237760
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 |