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-76771	IISW-SV-000159	SV-91467r4_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
IIS 8.5 Server Security Technical Implementation Guide	2020-06-05

Details

Check Text ( C-76427r4_chk )
Open the IIS 8.5 Manager. Click the IIS 8.5 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. If the server is hosting SharePoint, this is Not Applicable.

Fix Text (F-83467r3_fix)
Open the IIS 8.5 Manager. Click the IIS 8.5 web server name. Double-click the “Authorization Rules” icon. Remove all users other than “Administrator”.