Vulnerability Discussion

Remote access services, such as those providing remote access to network devices and information systems, which lack automated monitoring capabilities, increase risk and make remote user access management difficult at best.

Check

Verify Amazon Linux 2023 monitors all remote access methods.

Check that remote access methods are being logged by running the following command:

$ sudo grep -E '(auth.*|authpriv.*|daemon.*)' /etc/rsyslog.conf
auth.*;authpriv.*;daemon.* /var/log/secure

If "auth.*", "authpriv.*", or "daemon.*" are not configured to be logged, this is a finding.

Fix

Configure Amazon Linux 2023 to monitor all remote access methods by installing rsyslog with the following command:

$ sudo yum install rsyslog

Then add or update the following lines to the "/etc/rsyslog.conf" file:

auth.*;authpriv.*;daemon.* /var/log/secure

The "rsyslog" service must be restarted for the changes to take effect. To restart the "rsyslog" service, run the following command:

$ sudo systemctl restart rsyslog.service