The audit system must be configured to audit all attempts to alter system time through adjtimex.

From Red Hat Enterprise Linux 6 Security Technical Implementation Guide

Associated with: CCI-000169

SV-96155r1_rule The audit system must be configured to audit all attempts to alter system time through adjtimex.

Vulnerability discussion

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.

Check content

To determine if the system is configured to audit calls to the "adjtimex" system call, run the following command: $ sudo grep -w "adjtimex" /etc/audit/audit.rules If the system is configured to audit this activity, it will return a line. If the system is not configured to audit time changes, this is a finding.

Fix text

On a 32-bit system, add the following to "/etc/audit/audit.rules": # audit_time_rules -a always,exit -F arch=b32 -S adjtimex -k audit_time_rules On a 64-bit system, add the following to "/etc/audit/audit.rules": # audit_time_rules -a always,exit -F arch=b64 -S adjtimex -S settimeofday -S clock_settime -k audit_time_rules

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