The system is configured to use an unauthorized time server.

From Windows 7 Security Technical Implementation Guide

Part of Windows Time Service - Configure NTP Client

Associated with IA controls: ECSC-1

SV-25174r1_rule The system is configured to use an unauthorized time server.

Vulnerability discussion

The Windows Time Service controls time synchronization settings. Time synchronization is essential for authentication and auditing purposes. If the Windows Time Service is used, it should synchronize with a secure, authorized time source. Domain joined systems are automatically configured to synchronize with domain controllers. If an NTP server is configured it should synchronize with a secure, authorized time source.

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If the system needs to be configured to an NTP server, configure the system to point to an authorized time server by setting the policy value for Computer Configuration -> Administrative Templates -> System -> Windows Time Service -> Time Providers “Configure Windows NTP Client” to “Enabled”, and configure the “NtpServer” field to point to an authorized time server.

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