Unauthorized accounts must not have the Replace a process level token user right.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
WN12-UR-000039	WN12-UR-000039	WN12-UR-000039_rule		Medium

Description
Inappropriate granting of user rights can provide system, administrative, and other high-level capabilities. The "Replace a process level token" user right allows one process or service to start another process or service with a different security access token. A user with this right could use this to impersonate another account.

STIG	Date
Microsoft Windows Server 2012 Member Server Security Technical Implementation Guide	2013-07-25

Details

Check Text ( C-WN12-UR-000039_chk )
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 "Replace a process level token" user right, this is a finding: Local Service Network Service Severity Override: If an application requires this user right, this can be downgraded to not a finding if the following conditions are met: Vendor documentation must support the requirement for having the user right. The requirement must be documented with the IAO. The application account must meet requirements for application account passwords, such as length (V-36661) and required changes frequency (V-36662).

Check Text ( C-WN12-UR-000039_chk )

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 "Replace a process level token" user right, this is a finding:

Local Service
Network Service

Severity Override: If an application requires this user right, this can be downgraded to not a finding if the following conditions are met:
Vendor documentation must support the requirement for having the user right.
The requirement must be documented with the IAO.
The application account must meet requirements for application account passwords, such as length (V-36661) and required changes frequency (V-36662).

Fix Text (F-WN12-UR-000039_fix)
Configure the policy value for Computer Configuration -> Windows Settings -> Security Settings -> Local Policies -> User Rights Assignment -> "Replace a process level token" to only include the following accounts or groups: Local Service Network Service