Title

IPv6 6-to-4 addresses with a prefix of 2002::/16 must be filtered at the perimeter. (Cat II impact)

Discussion

"6-to-4" is a tunneling IPv6 transition mechanism [RFC 3056]. The guidance is the default case, which assumes that 6-to-4 is not being used as an IPv6 transition mechanism. If 6-to-4 is implemented, reference addition 6-to-4 guidance defined in the STIG. Drop all inbound IPv6 packets containing a source address of type 2002::/16. This assumes the 6-to-4 transition mechanism is not being used. Drop all inbound IPv6 packets containing a destination address of type 2002::/16. This assumes the 6-to-4 transition mechanism is not being used.

Check Content

Review the device 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 6-to-4 tunnel addresses and log all violations. source type: 2002::/16 If filters are not in place to deny 6-to-4 tunnel addresses, this is a finding.

Fix Text

Configure the device using filters to restrict IP addresses that contain any 6-to-4 addresses.

Additional Identifiers

Rule ID:

Vulnerability ID: V-18608

Group Title:

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.