A private IIS 10.0 website authentication mechanism must use client certificates to transmit session identifier to assure integrity.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-218749	IIST-SI-000220	SV-218749r903117_rule		Medium

Description
A DoD private website must use PKI as an authentication mechanism for web users. Information systems residing behind web servers requiring authorization based on individual identity must use the identity provided by certificate-based authentication to support access control decisions. Not using client certificates allows an attacker unauthenticated access to private websites. Satisfies: SRG-APP-000172-WSR-000104, SRG-APP-000224-WSR-000135, SRG-APP-000427-WSR-000186

Description

A DoD private website must use PKI as an authentication mechanism for web users. Information systems residing behind web servers requiring authorization based on individual identity must use the identity provided by certificate-based authentication to support access control decisions. Not using client certificates allows an attacker unauthenticated access to private websites. Satisfies: SRG-APP-000172-WSR-000104, SRG-APP-000224-WSR-000135, SRG-APP-000427-WSR-000186

STIG	Date
Microsoft IIS 10.0 Site Security Technical Implementation Guide	2023-09-12

Details

Check Text ( C-20222r903116_chk )
Note: If the server being reviewed is a public IIS 10.0 web server, this is Not Applicable. Note: If the server being reviewed is hosting SharePoint, this is Not Applicable. Note: If the server being reviewed is hosting WSUS, this is Not Applicable. Note: If certificate handling is performed at the Proxy/Load Balancer, this is Not Applicable. Follow the procedures below for each site hosted on the IIS 10.0 web server: Open the IIS 10.0 Manager. Double-click the "SSL Settings" icon. Verify the "Clients Certificate Required" check box is selected. If the "Clients Certificate Required" check box is not selected, this is a finding.

Check Text ( C-20222r903116_chk )

Note: If the server being reviewed is a public IIS 10.0 web server, this is Not Applicable.
Note: If the server being reviewed is hosting SharePoint, this is Not Applicable.
Note: If the server being reviewed is hosting WSUS, this is Not Applicable.
Note: If certificate handling is performed at the Proxy/Load Balancer, this is Not Applicable.

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Double-click the "SSL Settings" icon.

Verify the "Clients Certificate Required" check box is selected.

If the "Clients Certificate Required" check box is not selected, this is a finding.

Fix Text (F-20220r802891_fix)
Note: If the server being reviewed is a public IIS 10.0 web server, this is Not Applicable. Note: If the server being reviewed is hosting SharePoint, this is Not Applicable. Note: If certificate handling is performed at the Proxy/Load Balancer, this is Not Applicable. Follow the procedures below for each site hosted on the IIS 10.0 web server: Open the IIS 10.0 Manager. Double-click the "SSL Settings" icon. Verify the "Clients Certificate Required" check box is selected. Select "Apply" from the "Actions" pane.

Fix Text (F-20220r802891_fix)

Note: If the server being reviewed is a public IIS 10.0 web server, this is Not Applicable.
Note: If the server being reviewed is hosting SharePoint, this is Not Applicable.
Note: If certificate handling is performed at the Proxy/Load Balancer, this is Not Applicable.

Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Double-click the "SSL Settings" icon.

Verify the "Clients Certificate Required" check box is selected.

Select "Apply" from the "Actions" pane.