WhatsUp Gold OnMessage Deserialization of Untrusted Data Remote Code Execution Vulnerability

In WhatsUp Gold versions released before 2023.1.3, Distributed Edition installations can be exploited by using a deserialization tool to achieve a Remote Code Execution as SYSTEM.  The vulnerability exists in the main message processing routines NmDistributed.DistributedServiceBehavior.OnMessage for server and NmDistributed.DistributedClient.OnMessage for clients.