The system must not have 6to4 enabled.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22545 | GEN007780 | SV-63423r1_rule | Medium |
| Description |
|---|
| 6to4 is an IPv6 transition mechanism involving 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. |
| STIG | Date |
|---|---|
| Oracle Linux 5 Security Technical Implementation Guide | 2020-02-25 |
Details
| Check Text ( C-52127r2_chk ) |
|---|
| Check the system 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-54029r2_fix) |
|---|
| Disable the active 6to4 tunnel. # ip link set Add this command to a startup script, or remove the configuration creating the tunnel. |