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V-30660

The administrator must ensure the 6-to-4 router is configured to drop any IPv4 packets with protocol 41 received from the internal network.

Finding ID
NET-IPV6-065
Rule ID
SV-40455r1_rule
Severity
Cat II
CCE
(None)
Group Title
The 6-to-4 router is not filtering protocol 41
CCI
(None)
Target Key
(None)
Documentable
No
Discussion

The 6to4 specific filters accomplish the role of endpoint verification and provide assurance that the tunnels are being used properly. This primary guidance assumes that only the designated 6to4 router is allowed to form tunnel packets. If they are being formed inside an enclave and passed to the 6to4 router, they are suspicious and must be dropped. In accordance with DoD IPv6 IA Guidance for MO3 (S5-C7-8), packets as such must be dropped and logged as a security event.

Fix Text

If the router is functioning as a 6to4 router, configure an egress filter (inbound on the internal-facing interface) to drop any outbound IPv4 packets that are tunneling IPv6 packets.

Check Content

Currently JUNOS does not support 6to4 automatic tunneling so this vulnerability is not applicable

Responsibility

Information Assurance Officer