← Back to Microsoft IIS 10.0 Site Security Technical Implementation Guide

V-218763

CAT II (Medium)

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

Rule ID

SV-218763r1043182_rule

STIG

Microsoft IIS 10.0 Site Security Technical Implementation Guide

Version

V2R15

CCIs

CCI-002361

Discussion

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.

Check Content

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

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".