IIS 8.5 web server session IDs must be sent to the client using TLS.

From IIS 8.5 Server Security Technical Implementation Guide

Associated with: CCI-002418

SV-91453r1_rule IIS 8.5 web server session IDs must be sent to the client using TLS.

Vulnerability discussion

The HTTP protocol is a stateless protocol. To maintain a session, a session identifier is used. The session identifier is a piece of data that is 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.

Check content

Open the IIS 8.5 Manager. Click the IIS 8.5 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. Verify the "keepSessionIdSecure" is set to "True". If the "keepSessionIdSecure" is not set to "True", this is a finding.

Fix text

Open the IIS 8.5 Manager. Click the IIS 8.5 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.

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