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The systems local IPv6 firewall must implement a deny-all, allow-by-exception policy for inbound packets.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-50521 | OL6-00-000523 | SV-64727r2_rule | Medium |
| Description |
|---|
| In "ip6tables" the default policy is applied only after all the applicable rules in the table are examined for a match. Setting the default policy to "DROP" implements proper design for a firewall, i.e., any packets which are not explicitly permitted should not be accepted. |
| STIG | Date |
|---|---|
| Oracle Linux 6 Security Technical Implementation Guide | 2020-05-15 |
Details
| Check Text ( C-53047r2_chk ) |
|---|
| If IPv6 is disabled, this is not applicable. Inspect the file "/etc/sysconfig/ip6tables" to determine the default policy for the INPUT chain. It should be set to DROP: # grep ":INPUT" /etc/sysconfig/ip6tables If the default policy for the INPUT chain is not set to DROP, this is a finding. |
| Fix Text (F-55319r2_fix) |
|---|
| To set the default policy to DROP (instead of ACCEPT) for the built-in INPUT chain which processes incoming packets, add or correct the following line in "/etc/sysconfig/ip6tables": :INPUT DROP [0:0] Restart the IPv6 firewall: # service ip6tables restart |