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


Overview

Finding ID Version Rule ID IA Controls Severity
V-18608 NET-IPV6-024 SV-20160r2_rule ECSC-1 Medium
Description
"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.
STIG Date
Perimeter Router Security Technical Implementation Guide 2018-11-28

Details

Check Text ( C-22275r2_chk )
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 (F-19237r2_fix)
Configure the device using filters to restrict IP addresses that contain any 6-to-4 addresses.