Description

If the auditd daemon is configured to use the augenrules program to read audit rules during daemon startup (the default), add the following line to a file with suffix .rules in the directory /etc/audit/rules.d:

-w /etc/localtime -p wa -k audit_time_rules

If the auditd daemon is configured to use the auditctl utility to read audit rules during daemon startup, add the following line to /etc/audit/audit.rules file:

-w /etc/localtime -p wa -k audit_time_rules

The -k option allows for the specification of a key in string form that can be used for better reporting capability through ausearch and aureport and should always be used.

Rationale

Arbitrary changes to the system time can be used to obfuscate nefarious activities in log files, as well as to confuse network services that are highly dependent upon an accurate system time (such as sshd). All changes to the system time should be audited.

Remediation

Shell script

The following script can be run on the host to remediate the issue.

#!/bin/bash

# Perform the remediation for both possible tools: 'auditctl' and 'augenrules'
<ns10:sub idref="xccdf_org.ssgproject.content_value_function_fix_audit_watch_rule" use="legacy"/>
fix_audit_watch_rule "auditctl" "/etc/localtime" "wa" "audit_time_rules"
fix_audit_watch_rule "augenrules" "/etc/localtime" "wa" "audit_time_rules"