IIS 10.0 web server session IDs must be sent to the client using TLS.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-218820	IIST-SV-000152	SV-218820r561041_rule		Medium

Description
The HTTP protocol is a stateless protocol. To maintain a session, a session identifier is used. The session identifier is a piece of data used to identify a session and a user. If the session identifier is compromised by an attacker, the session can be hijacked. By encrypting the session identifier, the identifier becomes more difficult for an attacker to hijack, decrypt, and use before the session has expired.

Description

The HTTP protocol is a stateless protocol. To maintain a session, a session identifier is used. The session identifier is a piece of data used to identify a session and a user. If the session identifier is compromised by an attacker, the session can be hijacked. By encrypting the session identifier, the identifier becomes more difficult for an attacker to hijack, decrypt, and use before the session has expired.

STIG	Date
Microsoft IIS 10.0 Server Security Technical Implementation Guide	2021-03-24

Details

Check Text ( C-20292r310935_chk )
Open the IIS 10.0 Manager. Click the IIS 10.0 web server name. Under the "Management" section, double-click the "Configuration Editor" icon. From the "Section:" drop-down list, select "system.webServer/asp". Expand the "session" section. Verify the "keepSessionIdSecure" is set to "True". If the "keepSessionIdSecure" is not set to "True", this is a finding.

Fix Text (F-20290r310936_fix)
Open the IIS 10.0 Manager. Click the IIS 10.0 web server name. Under "Management" section, double-click the "Configuration Editor" icon. From the "Section:" drop-down list, select "system.webServer/asp". Expand the "session" section. Select "True" for the "keepSessionIdSecure" setting. Select "Apply" from the "Actions" pane.