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The IIS 10.0 websites connectionTimeout setting must be explicitly configured to disconnect an idle session.


Overview

Finding ID Version Rule ID IA Controls Severity
V-218763 IIST-SI-000236 SV-218763r810858_rule Medium
Description
Leaving sessions open indefinitely is a major security risk. An attacker can easily use an already authenticated session to access the hosted application as the previously authenticated user. By closing sessions after a set period of inactivity, the web server can make certain that those sessions that are not closed through the user logging out of an application are eventually closed. Acceptable values are 5 minutes for high-value applications, 10 minutes for medium-value applications, and 15 minutes for low-value applications.
STIG Date
Microsoft IIS 10.0 Site Security Technical Implementation Guide 2022-06-23

Details

Check Text ( C-20236r802893_chk )
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name.

Select "Configuration Editor" under the "Management" section.

From the "Section:" drop-down list at the top of the configuration editor, locate "system.web/sessionState".

Verify the "timeout" is set to "00:15:00 or less”.

If "timeout" is not set to "00:15:00 or less”, this is a finding.
Fix Text (F-20234r802894_fix)
Follow the procedures below for each site hosted on the IIS 10.0 web server:

Open the IIS 10.0 Manager.

Click the site name.

Select "Configuration Editor" under the "Management" section.

From the "Section:" drop-down list at the top of the configuration editor, locate "system.web/sessionState".

Set the "timeout" to "00:15:00 or less”.

In the "Actions" pane, click "Apply".