Details
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 20 minutes for low-value applications.
Solution
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 ’00:20:00 or less’, using the lowest value possible depending upon the application.
Acceptable values are 5 minutes for high-value applications, 10 minutes for medium-value applications, and 20 minutes for low-value applications.
In the ‘Actions’ pane, click ‘Apply’.
Supportive Information
The following resource is also helpful.
This security hardening control applies to the following category of controls within NIST 800-53: Access Control.This control applies to the following type of system Windows.
References
- 800-53|AC-12
- CAT|II
- CCI|CCI-002361
- Rule-ID|SV-218763r558649_rule
- STIG-ID|IIST-SI-000236
- STIG-Legacy|SV-109351
- STIG-Legacy|V-100247
- Vuln-ID|V-218763