A private IIS 8.5 website must only accept Secure Socket Layer connections.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-76779	IISW-SI-000203	SV-91475r3_rule		Medium

Description
Transport Layer Security (TLS) encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily read by an unauthorized party. A private web server must use a FIPS 140-2-approved TLS version, and all non-FIPS-approved SSL versions must be disabled. FIPS 140-2-approved TLS versions include TLS V1.1 or greater. NIST SP 800-52 specifies the preferred configurations for government systems.

Description

Transport Layer Security (TLS) encryption is a required security setting for a private web server. Encryption of private information is essential to ensuring data confidentiality. If private information is not encrypted, it can be intercepted and easily read by an unauthorized party. A private web server must use a FIPS 140-2-approved TLS version, and all non-FIPS-approved SSL versions must be disabled. FIPS 140-2-approved TLS versions include TLS V1.1 or greater. NIST SP 800-52 specifies the preferred configurations for government systems.

STIG	Date
IIS 8.5 Site Security Technical Implementation Guide	2019-10-01

Details

Check Text ( C-76435r3_chk )
Note: If the server being reviewed is a public IIS 8.5 web server, this is Not Applicable. Note: If SSL is installed on load balancer/proxy server through which traffic is routed to the IIS 8.5 server, and the IIS 8.5 server receives traffic from the load balancer/proxy server, the SSL requirement must be met on the load balancer/proxy server. Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Click the site name. Double-click the "SSL Settings" icon. Verify "Require SSL" check box is selected. If the "Require SSL" check box is not selected, this is a finding.

Check Text ( C-76435r3_chk )

Note: If the server being reviewed is a public IIS 8.5 web server, this is Not Applicable.

Note: If SSL is installed on load balancer/proxy server through which traffic is routed to the IIS 8.5 server, and the IIS 8.5 server receives traffic from the load balancer/proxy server, the SSL requirement must be met on the load balancer/proxy server.

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

Open the IIS 8.5 Manager.
Click the site name.
Double-click the "SSL Settings" icon.
Verify "Require SSL" check box is selected.

If the "Require SSL" check box is not selected, this is a finding.

Fix Text (F-83475r1_fix)
Note: If the server being reviewed is a public IIS 8.5 web server, this is Not Applicable. Follow the procedures below for each site hosted on the IIS 8.5 web server: Open the IIS 8.5 Manager. Click the site name. Double-click the "SSL Settings" icon. Select "Require SSL" check box. Select "Apply" from the "Actions" pane.