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The IIS 10.0 web server must have a global authorization rule configured to restrict access.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218825 IIST-SV-000159 SV-218825r561041_rule Medium
Description
Authorization rules can be configured at the server, website, folder (including Virtual Directories), or file level. It is recommended that URL Authorization be configured to only grant access to the necessary security principals. Configuring a global Authorization rule that restricts access ensures inheritance of the settings down through the hierarchy of web directories. This will ensure access to current and future content is only granted to the appropriate principals, mitigating risk of unauthorized access.
STIG Date
Microsoft IIS 10.0 Server Security Technical Implementation Guide 2020-09-25

Details

Check Text ( C-20297r310950_chk )
Open the IIS 10.0 Manager.

Click the IIS 10.0 web server name.

Double-click the ".NET Authorization Rules" icon.

If any user other than "Administrator" is listed, this is a finding.

If .NET is not installed, this is Not Applicable.
Fix Text (F-20295r310951_fix)
Open the IIS 10.0 Manager.

Click the IIS 10.0 web server name.

Double-click the "Authorization Rules" icon.

Remove all users other than "Administrator".