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Mail relaying must be restricted.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-50815 | OL6-00-000249 | SV-65021r2_rule | Medium |
| Description |
|---|
| This ensures "postfix" accepts mail messages (such as cron job reports) from the local system only, and not from the network, which protects it from network attack. |
| STIG | Date |
|---|---|
| Oracle Linux 6 Security Technical Implementation Guide | 2018-09-19 |
Details
| Check Text ( C-53287r2_chk ) |
|---|
| If the system is an authorized mail relay host, this is not applicable. Run the following command to ensure postfix accepts mail messages from only the local system: $ grep inet_interfaces /etc/postfix/main.cf If properly configured, the output should show only "localhost". If it does not, this is a finding. |
| Fix Text (F-55609r1_fix) |
|---|
| Edit the file "/etc/postfix/main.cf" to ensure that only the following "inet_interfaces" line appears: inet_interfaces = localhost |