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Xanadu and ACLs

 ServiceNow Security Center is an included application that helps system administrators manage, monitor, and improve the security of their instance. It brings together a suite of purpose-built security related tools to assist administrators in maintaining the highest levels of security monitoring and security configurations.

Access Control List (ACL) Updates:
  1. Deny by default behavior
By default, the ACL engine completely denies access if an ACL is empty or invalid. Empty ACLs are defined as ACLs without at least one of these components:
  • Defined role
  • Security attribute
  • Data condition
  • Script
2. Deny-Unless ACL
Deny-Unless ACLs are evaluated with a "deny-unless" approach. The ACL defines the users that will NOT be denied. Said another way, the user will be denied access unless the role, condition, and script requirements are met.
Important: Deny-Unless ACLs will take priority against Allow-If ACLs in ACL Evaluation as it will be evaluated first.

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