The IIS 8.5 web server must have a global authorization rule configured to restrict access.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-214441	IISW-SV-000159	SV-214441r881085_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.

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 8.5 Server Security Technical Implementation Guide	2022-12-09

Details

Check Text ( C-15651r881083_chk )
If ASP.NET is not installed, this is Not Applicable. If the server is hosting SharePoint, this is Not Applicable. If the server is hosting WSUS, this is Not Applicable. If the server is hosting Exchange, this is Not Applicable. Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Double-click the ".NET Authorization Rules" icon. Ensure "All Users" is set to "Allow", and "Anonymous Users" is set to "Deny", otherwise this is a finding. If any other rules are present, this is a finding.

Check Text ( C-15651r881083_chk )

If ASP.NET is not installed, this is Not Applicable.
If the server is hosting SharePoint, this is Not Applicable.
If the server is hosting WSUS, this is Not Applicable.
If the server is hosting Exchange, this is Not Applicable.

Open the IIS 8.5 Manager.

Click the IIS 8.5 web server name.

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

Ensure "All Users" is set to "Allow", and "Anonymous Users" is set to "Deny", otherwise this is a finding.
If any other rules are present, this is a finding.

Fix Text (F-15649r881084_fix)
Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Double-click the ".NET Authorization Rules" icon. Alter the list as necessary to ensure "All Users" is set to "Allow" and "Anonymous Users" is set to "Deny". Remove any other line items.