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The SLES for vRealize must not have 6to4 enabled.


Finding ID Version Rule ID IA Controls Severity
V-240453 VRAU-SL-000660 SV-240453r671100_rule Medium
6to4 is an IPv6 transition mechanism that involves tunneling IPv6 packets encapsulated in IPv4 packets on an ad-hoc basis. This is not a preferred transition strategy and increases the attack surface of the system.
VMware vRealize Automation 7.x SLES Security Technical Implementation Guide 2023-09-22


Check Text ( C-43686r671098_chk )
Check the SLES for vRealize for any active "6to4" tunnels without specific remote addresses:

# ip tun list | grep "remote any" | grep "ipv6/ip"

If any results are returned the "tunnel" is the first field.

If any results are returned, this is a finding.
Fix Text (F-43645r671099_fix)
Disable the active 6to4 tunnel:

# ip link set down

Add this command to a startup script, or remove the configuration creating the tunnel.