Detections
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RHEL-09-252050 - RHEL 9 must be configured to prevent unrestricted mail relaying.
Information
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.Solution
Modify the postfix configuration file to restrict client connections to the local network with the following command:$ sudo postconf -e 'smtpd_client_restrictions = permit_mynetworks,reject'
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_9_V2R8_STIG.zip
Item Details
Audit Name: DISA Red Hat Enterprise Linux 9 STIG v2r8
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257951r1014843_rule, STIG-ID|RHEL-09-252050, Vuln-ID|V-257951
Plugin: Unix
Control ID: e65c8d91ed36cb550b075aa760c30087363c3f6247c1a3d679d046bde52fe79f