cis-aws-euc-5-3

name	cis-aws-euc-5.3
description	Ensure maximum session duration is no longer than 10 hours
category	cis-end-user-compute
version	1.2.0
author	cyberstrike-official
tags	["cis","aws","end-user-compute","appstream","session-management","timeout"]
cis_id	5.3
cis_benchmark	CIS AWS End User Compute Services Benchmark v1.2.0
tech_stack	["aws"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure maximum session duration is no longer than 10 hours (Automated)

Profile Applicability

• Level 1

Description

When creating a fleet for AppStream 2.0 configure the Maximum session duration in minutes to be no greater than 600.

Rationale

Having a session duration lasting longer than 10 hours should not be necessary and if running for any malicious reasons provides a greater time for usage than should be allowed.

Impact

None - this is a security best practice.

Audit Procedure

Perform the following steps to view the Fleet settings in AppStream.

Using AWS Console

1. Log in to the AppStream 2.0 console at https://console.aws.amazon.com/appstream2
2. In the left pane click on Fleets
3. Select the link for the fleet name you wish to view
4. On the Fleet configuration section confirm that Maximum session duration is set to 600 minutes or less

If Maximum session duration is set to anything greater than 600 minutes refer to the remediation below.

Using AWS CLI

Not applicable - must be audited via Console.

Expected Result

Maximum session duration is set to 600 minutes (10 hours) or less.

Remediation

Using AWS Console

Perform the following steps to edit the Fleet settings in AppStream:

1. Log in to the AppStream 2.0 console at https://console.aws.amazon.com/appstream2
2. In the left pane click on Fleets
3. Select the link for the fleet name you wish to edit
4. Click Actions, Stop
5. Scroll to the Fleet configuration section and click Edit
6. Change the Maximum session duration is set to 600 minutes or less and click Save Changes
7. Click Actions, Start

Using AWS CLI

Not applicable - must be configured via Console.

Default Value

By default, AWS Appstream 2.0 maximum session time is 960 minutes.

References

1. https://docs.aws.amazon.com/appstream2/latest/developerguide/set-up-stacks-fleets.html
2. https://us-east-1.console.aws.amazon.com/appstream2/home?region=us-east-1#/create-fleet