STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 must forward mail from postmaster to the root account using a postfix alias.

DISA Rule

SV-257953r958424_rule

Vulnerability Number

V-257953

Group Title

SRG-OS-000046-GPOS-00022

Rule Version

RHEL-09-252060

Severity

CAT II

CCI(s)

• CCI-000139 - Alert organization-defined personnel or roles within an organization-defined time period in the event of an audit logging process failure.

Weight

10

Fix Recommendation

Configure a valid email address as an alias for the root account.

Append the following line to "/etc/aliases":

postmaster: root

Then, run the following command:

$ sudo newaliases

Check Contents

Verify that the administrators are notified in the event of an audit processing failure.

Check that the "/etc/aliases" file has a defined value for "root".

$ sudo grep "postmaster:\s*root$" /etc/aliases

If the command does not return a line, or the line is commented out, ask the system administrator to indicate how they and the information systems security officer (ISSO) are notified of an audit process failure. If there is no evidence of the proper personnel being notified of an audit processing failure, this is a finding.

Vulnerability Number

V-257953

Documentable

False

Rule Version

RHEL-09-252060

Severity Override Guidance

Verify that the administrators are notified in the event of an audit processing failure.

Check that the "/etc/aliases" file has a defined value for "root".

$ sudo grep "postmaster:\s*root$" /etc/aliases

If the command does not return a line, or the line is commented out, ask the system administrator to indicate how they and the information systems security officer (ISSO) are notified of an audit process failure. If there is no evidence of the proper personnel being notified of an audit processing failure, this is a finding.

Check Content Reference

M

Target Key

5551