cis-aws-euc-5-4

name	cis-aws-euc-5.4
description	Ensure session disconnect timeout is set to 5 minutes or less
category	cis-end-user-compute
version	1.2.0
author	cyberstrike-official
tags	["cis","aws","end-user-compute","appstream","session-management","timeout"]
cis_id	5.4
cis_benchmark	CIS AWS End User Compute Services Benchmark v1.2.0
tech_stack	["aws"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure session disconnect timeout is set to 5 minutes or less (Automated)

Profile Applicability

• Level 1

Description

Disconnect timeout in minutes, is the amount of of time that a streaming session remains active after users disconnect.

Rationale

If users try to reconnect to the streaming session after a disconnection or network interruption within the 5 minutes, they are connected to their previous session. Otherwise, they are connected to a new session with a new streaming instance and that instance isn't sitting out there not being used.

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 Disconnect timeout is set to 5 minutes or less

If Disconnect timeout is set to anything greater than 5 minutes refer to the remediation below.

Using AWS CLI

Not applicable - must be audited via Console.

Expected Result

Disconnect timeout is set to 5 minutes or less.

Remediation

Using AWS Console

Perform the following steps to update 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. Scroll to the Fleet configuration section and click Edit
5. Change the Disconnect timeout to 5 minutes or less

Using AWS CLI

Not applicable - must be configured via Console.

Default Value

By default, AWS Appstream 2.0 session disconnect time is set to 15 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