AlmaLinux OS 9 must have the postfix package installed.

STIG ID: ALMA-09-006845  |  SRG: SRG-OS-000304-GPOS-00121 |  Severity: medium |  CCI: CCI-000015 |  Vulnerability Id: V-272485

Vulnerability Discussion

Postfix is a free, open-source mail transfer agent (MTA) that sends and receives emails. It is a server-side application that can be used to set up a local mail server, create a null-client mail relay, use a Postfix server as a destination for multiple domains, or choose an LDAP directory instead of files for lookups. Postfix supports protocols like LDAP, SMTP AUTH (SASL), and TLS. It uses the Simple Mail Transfer Protocol (SMTP) to transfer emails between servers.

Satisfies: SRG-OS-000304-GPOS-00121, SRG-OS-000343-GPOS-00134, SRG-OS-000363-GPOS-00150, SRG-OS-000447-GPOS-00201

Check

Verify that AlmaLinux OS 9 has the postfix package installed with the following command:

$ dnf list --installed postfix

Example output:

postfix.x86_64 2:3.5.9-24.el9 @AppStream

If the "postfix" package is not installed, this is a finding.

Fix

Install the postfix package with the following command:

$ sudo dnf install postfix
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