Network devices must be configured to restrict the acceptance of any IP packets from the unspecified address, (0:0:0:0:0:0:0:0 or ::/128).

From Perimeter L3 Switch Security Technical Implementation Guide

Part of IPv6 Unspecified ADDR is not blocked

Associated with IA controls: ECSC-1

SV-15404r2_rule Network devices must be configured to restrict the acceptance of any IP packets from the unspecified address, (0:0:0:0:0:0:0:0 or ::/128).

Vulnerability discussion

The address 0:0:0:0:0:0:0:0, also defined ::/128 is called the unspecified address. It must never be assigned to any node. It indicates the absence of an address. One example of its use is in the Source Address field of any IPv6 packets sent by an initializing host before it has learned its own address.The unspecified address must not be used as the destination address of IPv6 packets or in IPv6 Routing Headers. A router must never forward an IPv6 packet with a source address of unspecified.

Check content

Review the premise router configuration to ensure filters are in place to restrict the IP addresses explicitly, or implicitly. Verify that ingress and egress ACLs for IPv6 have been defined to deny the Unspecified Address and log all violations. If the appropriate filters are not configured and applied, this is a finding.

Fix text

The administrator will configure the router ACLs to restrict IP addresses that contain any Unspecified Address.

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