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The Red Hat Enterprise Linux operating system must be configured to prevent unrestricted mail relaying.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-204619 | RHEL-07-040680 | SV-204619r603261_rule | Medium |
| Description |
|---|
| If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sending spam or other unauthorized activity. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 7 Security Technical Implementation Guide | 2021-03-01 |
Details
| Check Text ( C-4743r89049_chk ) |
|---|
| Verify the system is configured to prevent unrestricted mail relaying. Determine if "postfix" is installed with the following commands: # yum list installed postfix postfix-2.6.6-6.el7.x86_64.rpm If postfix is not installed, this is Not Applicable. If postfix is installed, determine if it is configured to reject connections from unknown or untrusted networks with the following command: # postconf -n smtpd_client_restrictions smtpd_client_restrictions = permit_mynetworks, reject If the "smtpd_client_restrictions" parameter contains any entries other than "permit_mynetworks" and "reject", this is a finding. |
| Fix Text (F-4743r89050_fix) |
|---|
| If "postfix" is installed, modify the "/etc/postfix/main.cf" file to restrict client connections to the local network with the following command: # postconf -e 'smtpd_client_restrictions = permit_mynetworks,reject' |