The Impersonate a client after authentication user right must only be assigned to Administrators, Service, Local Service, and Network Service.

From Windows Server 2016 Security Technical Implementation Guide

Associated with: CCI-002235

SV-88449r1_rule The Impersonate a client after authentication user right must only be assigned to Administrators, Service, Local Service, and Network Service.

Vulnerability discussion

Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities.The "Impersonate a client after authentication" user right allows a program to impersonate another user or account to run on their behalf. An attacker could use this to elevate privileges.

Check content

Verify the effective setting in Local Group Policy Editor. Run "gpedit.msc". Navigate to Local Computer Policy >> Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment. If any accounts or groups other than the following are granted the "Impersonate a client after authentication" user right, this is a finding. - Administrators - Service - Local Service - Network Service If an application requires this user right, this would not be a finding. Vendor documentation must support the requirement for having the user right. The requirement must be documented with the ISSO. The application account must meet requirements for application account passwords, such as length (WN16-00-000060) and required frequency of changes (WN16-00-000070).

Fix text

Configure the policy value for Computer Configuration >> Windows Settings >> Security Settings >> Local Policies >> User Rights Assignment >> "Impersonate a client after authentication" to include only the following accounts or groups: - Administrators - Service - Local Service - Network Service

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