V-24357

Discussion

Audit records contain evidence that can be used in the investigation of compromised systems. To prevent this evidence from compromise, it must be sent to a separate system continuously. Methods for sending audit records include, but are not limited to, system audit tools used to send logs directly to another host or through the system's syslog service to another host.

Check Content

Verify the system is configured to forward all audit records to a remote server. If the system is not configured to provide this function, this is a finding.

Procedure:
Ensure the audit option for the kernel is enabled.

# cat /proc/cmdline | tr ' ' '\n' | grep -i audit

If the kernel does not have the "audit=1" option specified, this is a finding.

Ensure the kernel auditing is active.

# /sbin/auditctl -s | tr ' ' '\n' | egrep 'enabled|pid'
When auditing is active, the “enabled” value is set to 1 and the “pid” value will be greater than 0.
If the "enabled" setting is either missing or not set to "1", this is a finding.
If the “pid” setting is 0, the audit daemon is not running and this is also a finding.

Ensure the syslog plugin is active for the audit dispatch daemon.


# grep "active" /etc/audisp/plugins.d/syslog.conf | grep -v "^#"

If the "active" setting is either missing or not set to "yes", this is a finding.

Ensure all audit records are fowarded to a remote server.

# grep "\*.\*" /etc/syslog.conf |grep "@" | grep -v "^#" (for syslog)
or:
# grep "\*.\*" /etc/rsyslog.conf | grep "@" | grep -v "^#" (for rsyslog)


If neither of these lines exist, it is a finding.