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Access Credential Manager as a trusted caller

Updated: May 8, 2013

Applies To: Windows 7, Windows 8, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, Windows Vista

This security policy reference topic for the IT professional describes the best practices, location, values, policy management, and security considerations for this policy setting.

Reference

The Access Credential Manager as a trusted caller policy setting is used by Credential Manager during backup and restore. No accounts should have this privilege because it is assigned only to the Winlogon service. Saved credentials of users may be compromised if this privilege is given to other entities.

This policy setting is supported on versions of Windows that are designated in the Applies To list.

Constant: SeTrustedCredManAccessPrivilege

Possible values

  • User-defined list of accounts

  • Not defined

Best practices

  • Do not modify this policy setting from the default.

Location

\Computer Configuration\Windows Settings\Security Settings\Local Policies\User Rights Assignment

Default values

The following table lists the actual and effective default policy values for the most recent supported versions of Windows. Default values are also listed on the policy’s property page.

Server type or GPO Default value

Default domain policy

Not defined

Default domain controller policy

Not defined

Stand-alone server default settings

Not defined

Domain controller effective default settings

Not defined

Member server effective default settings

Not defined

Client computer effective default settings

Not defined

Operating system version differences

This setting was introduced with Windows Vista and Windows Server 2008. There are no differences in the way this policy setting works between supported versions of Windows.

Policy management

This section describes features, tools, and guidance to help you manage this policy.

A restart of the computer is not required for this policy setting to be effective.

Any change to the user rights assignment for an account becomes effective the next time the owner of the account logs on.

Group Policy

Settings are applied in the following order through a Group Policy Object (GPO), which will overwrite settings on the local computer at the next Group Policy update:

  1. Local policy settings

  2. Site policy settings

  3. Domain policy settings

  4. OU policy settings

When a local setting is greyed out, it indicates that a GPO currently controls that setting.

Security considerations

This section describes how an attacker might exploit a feature or its configuration, how to implement the countermeasure, and the possible negative consequences of countermeasure implementation.

Vulnerability

If an account is given this user right, the user of the account may create an application that calls into Credential Manager and is returned the credentials for another user.

Countermeasure

Do not define the Access Credential Manager as a trusted caller policy setting for any accounts besides Credential Manager.

Potential impact

None. Not defined is the default configuration.

See Also

Concepts

User Rights Assignment