The NTP server is not configured with a symmetric key that is unique from any key configured on any other NTP server.

From Network Devices Security Technical Implementation Guide

Part of NTP server does not use a unique key

SV-19127r1_rule The NTP server is not configured with a symmetric key that is unique from any key configured on any other NTP server.

Vulnerability discussion

NTP provides an efficient and scalable method for managed network elements to actively synchronize to an accurate time source. Insuring that there are always NTP servers available to provide time is critical. It is imperative that all single points of failure for the NTP infrastructure are eliminated. Knowing the correct time is not only crucial for proper network functioning but also for security. Compromising an NTP server opens the door to more sophisticated attacks that include NTP poisoning, replay attacks, and denial of service.

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Interview the IAO and administrator to determine if unique keys have been configured.

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If a hashing algorithm is being used, all servers must be configured with a symmetric key that is unique from any key configured on any other NTP server.

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