Amazon Linux 2023 must encrypt the transfer of audit records off-loaded onto a different system or media from the system being audited via rsyslog.

Information stored in one location is vulnerable to accidental or incidental deletion or alteration.

Verify Amazon Linux 2023 encrypts audit records off-loaded onto a different system or media from the system being audited via rsyslog with the following command:

$ sudo grep -i '$ActionSendStreamDriverMode' /etc/rsyslog.conf /etc/rsyslog.d/*.conf /etc/rsyslog.conf:$ActionSendStreamDriverMode 1

If the value of the "$ActionSendStreamDriverMode" option is not set to "1" or the line is commented out, this is a finding.

Configure Amazon Linux 2023 to encrypt off-loaded audit records via rsyslog by setting the following options in "/etc/rsyslog.conf" or "/etc/rsyslog.d/[customfile].conf":

$ActionSendStreamDriverMode 1