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Mail relaying must be restricted.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-240432 | VRAU-SL-000555 | SV-240432r671037_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 |
|---|---|
| VMware vRealize Automation 7.x SLES Security Technical Implementation Guide | 2021-06-24 |
Details
| Check Text ( C-43665r671035_chk ) |
|---|
| Determine if Sendmail only binds to loopback addresses by examining the "DaemonPortOptions" configuration options. # grep -i "O DaemonPortOptions" /etc/sendmail.cf If there are uncommented DaemonPortOptions lines, and all such lines specify system loopback addresses, this is not a finding. Otherwise, determine if Sendmail is configured to allow open relay operation. # grep -i promiscuous_relay /etc/mail/sendmail.mc If the promiscuous relay feature is enabled, this is a finding. |
| Fix Text (F-43624r671036_fix) |
|---|
| If the SLES for vRealize does not need to receive mail from external hosts, add one or more "DaemonPortOptions" lines referencing system loopback addresses (such as "O DaemonPortOptions=Addr=127.0.0.1,Port=smtp,Name=MTA") and remove lines containing non-loopback addresses. # sed -i "s/O DaemonPortOptions=Name=MTA/O DaemonPortOptions=Addr=127.0.0.1,Port=smtp,Name=MTA/" /etc/sendmail.cf Restart the sendmail service: # service sendmail restart |