Each IIS 8.5 website must be assigned a default host header.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76807	IISW-SI-000219	SV-91503r3_rule		Medium

Description
The web server must be configured to listen on a specified IP address and port. Without specifying an IP address and port for the web server to utilize, the web server will listen on all IP addresses available to the hosting server. If the web server has multiple IP addresses, i.e., a management IP address, the web server will also accept connections on the management IP address. Accessing the hosted application through an IP address normally used for non-application functions opens the possibility of user access to resources, utilities, files, ports, and protocols that are protected on the desired application IP address.

Description

The web server must be configured to listen on a specified IP address and port. Without specifying an IP address and port for the web server to utilize, the web server will listen on all IP addresses available to the hosting server. If the web server has multiple IP addresses, i.e., a management IP address, the web server will also accept connections on the management IP address. Accessing the hosted application through an IP address normally used for non-application functions opens the possibility of user access to resources, utilities, files, ports, and protocols that are protected on the desired application IP address.

STIG	Date
IIS 8.5 Site Security Technical Implementation Guide	2020-06-05

Details

Check Text ( C-76463r3_chk )
Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Right-click on the site name under review. Select “Edit Bindings”. Verify there are hostname entries and unique IP addresses assigned to port 80 for HTTP and port 443 for HTTPS. Other approved and documented ports may be used. If both hostname entries and unique IP addresses are not configure to port 80 for HTTP and port 443 for HTTPS (or other approved and documented port), this is a finding. Note: If certificate handling is performed at the Proxy/Load Balancer, this is not a finding. Note: If HTTP/Port 80 is not being used, and isn’t configured as above, this is not a finding.

Check Text ( C-76463r3_chk )

Follow the procedures below for each site hosted on the IIS 8.5 web server:

Open the IIS 8.5 Manager.
Right-click on the site name under review.
Select “Edit Bindings”.

Verify there are hostname entries and unique IP addresses assigned to port 80 for HTTP and port 443 for HTTPS. Other approved and documented ports may be used.

If both hostname entries and unique IP addresses are not configure to port 80 for HTTP and port 443 for HTTPS (or other approved and documented port), this is a finding.

Note: If certificate handling is performed at the Proxy/Load Balancer, this is not a finding.

Note: If HTTP/Port 80 is not being used, and isn’t configured as above, this is not a finding.

Fix Text (F-83503r2_fix)
Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Right-click on the site name under review. Select “Edit Bindings”. Assign hostname entries and unique IP addresses to port 80 for HTTP and port 443 for HTTPS. Other approved and documented ports may be used. Click "OK". Select "Apply" from the "Actions" pane.