Microsoft Intune service must initiate a session lock after a 15-minute period of inactivity.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-267303	SRG-APP-000003-UEM-000003	MSIN-24-000030	SV-267303r1026081_rule	2024-10-04	1

Description
A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system, but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their application session prior to vacating the vicinity, applications need to be able to identify when a user's application session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled. This is typically at the operating system level and results in a system lock but may be at the application level where the application interface window is secured instead. Satisfies: FMT_SMF.1.1(2) c.8 Reference: PP-MDM-411047 Satisfies: SRG-APP-000003-UEM-000003, SRG-APP-000295-UEM-000169

Description

A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system, but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their application session prior to vacating the vicinity, applications need to be able to identify when a user's application session has idled and take action to initiate the session lock. The session lock is implemented at the point where session activity can be determined and/or controlled. This is typically at the operating system level and results in a system lock but may be at the application level where the application interface window is secured instead. Satisfies: FMT_SMF.1.1(2) c.8 Reference: PP-MDM-411047 Satisfies: SRG-APP-000003-UEM-000003, SRG-APP-000295-UEM-000169

ℹ️ Check
To verify the inactivity timeout is configured for 15 minutes or less, follow the steps outlined below: 1. Sign in to portal.office365.com (or .us if the user is a GCCH or DOD tenant). 2. Navigate to Admin >> Settings >> Org Settings >> Security and Privacy (tab on top of page) >> Idle Session Timeout. 3. Select the check box to enable "Turn on to set the period of inactivity". 4. Select custom option, then verify it has been set to 15. If the inactivity timeout is not set to 15 minutes or less, this is a finding.

ℹ️ Check

To verify the inactivity timeout is configured for 15 minutes or less, follow the steps outlined below: 1. Sign in to portal.office365.com (or .us if the user is a GCCH or DOD tenant). 2. Navigate to Admin >> Settings >> Org Settings >> Security and Privacy (tab on top of page) >> Idle Session Timeout. 3. Select the check box to enable "Turn on to set the period of inactivity". 4. Select custom option, then verify it has been set to 15. If the inactivity timeout is not set to 15 minutes or less, this is a finding.

✔️ Fix
Sign in to portal.office365.com (or .us if the user is a GCCH or DOD tenant). 1. Navigate to Admin >> Settings >> Org Settings >> Security and Privacy (tab on top of page) >> Idle Session Timeout. 2. Select the check box to enable "Turn on to set the period of inactivity". 3. Select custom option, then enter "15". 4. Select "Save".