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

RHEL 9 must be configured so that the rsyslog daemon does not accept log messages from other servers unless the server is being used for log aggregation.

DISA Rule

SV-258143r1184329_rule

Vulnerability Number

V-258143

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

RHEL-09-652025

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure RHEL 9 to not receive remote logs using rsyslog.

Remove the lines in /etc/rsyslog.conf and any files in the /etc/rsyslog.d directory that match any of the following:
InputTCPServerRun
UDPServerRun
RELPServerRun
module(load="imtcp")
module(load="imudp")
module(load="imrelp")
input(type="imudp" port="514")
input(type="imtcp" port="514")
input(type="imrelp" port="514")

The rsyslog daemon must be restarted for the changes to take effect:

$ sudo systemctl restart rsyslog.service

Check Contents

Note: If the system administrator (SA) can demonstrate that another tool (e.g., SPLUNK) is being used to manage log off-load and aggregation in lieu of rsyslog, this is not applicable.

Verify RHEL 9 is not configured to receive remote logs using rsyslog with the following command:

$ ss -tulnp | grep rsyslog

If no output is returned, rsyslog is not listening for remote messages and is compliant.

If output appears, check for configured ports (514 is the default for syslog).

Check for remote logging configuration in rsyslog by examining the rsyslog configuration files:

$ sudo grep -E 'InputTCPServerRun|UDPServerRun|RELPServerRun|imtcp|imudp|imrelp' /etc/rsyslog.conf /etc/rsyslog.d/*

If this command returns uncommented lines enabling network listeners, the system is accepting remote logs. If this system is not documented and authorized as a log aggregation server, this is a finding.

Vulnerability Number

V-258143

Documentable

False

Rule Version

RHEL-09-652025

Severity Override Guidance

Note: If the system administrator (SA) can demonstrate that another tool (e.g., SPLUNK) is being used to manage log off-load and aggregation in lieu of rsyslog, this is not applicable.

Verify RHEL 9 is not configured to receive remote logs using rsyslog with the following command:

$ ss -tulnp | grep rsyslog

If no output is returned, rsyslog is not listening for remote messages and is compliant.

If output appears, check for configured ports (514 is the default for syslog).

Check for remote logging configuration in rsyslog by examining the rsyslog configuration files:

$ sudo grep -E 'InputTCPServerRun|UDPServerRun|RELPServerRun|imtcp|imudp|imrelp' /etc/rsyslog.conf /etc/rsyslog.d/*

If this command returns uncommented lines enabling network listeners, the system is accepting remote logs. If this system is not documented and authorized as a log aggregation server, this is a finding.

Check Content Reference

M

Target Key

5551