The network element 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).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-14696	NET-IPV6-028	SV-15405r1_rule		High

Description
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.

Description

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.

STIG	Date
Perimeter L3 Switch Security Technical Implementation Guide - Cisco	2017-12-07

Details

Check Text ( C-12871r4_chk )
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 (F-14161r2_fix)
The administrator will configure the router ACLs to restrict IP addresses that contain any Unspecified Address.