cis-gworkspace-3.1.1.1.1

DevOps & Security

Ensure external sharing options for primary calendars are configured

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3.1.1.1.1 Ensure external sharing options for primary calendars are configured (Manual)

Description

Control how much calendar information users in your organization can share externally.

Rationale

Prevent data leakage by restricting the amount of information that is externally viewable when a user shares their calendar with someone external to your organization.

Impact

Once you limit external sharing for your organization, users can't exceed these limits when sharing individual events. For example, if you limit your organization's external sharing to Free/Busy, events with Public visibility are only shared as Free/Busy.
External mobile users who previously synced events may keep seeing restricted details. That access stops when their device is wiped and re-synced.
If you lower the external sharing level, people outside your organization may lose access to calendars they could previously see.

Audit Procedure

To verify this setting via the Google Workspace Admin Console:

Log in to https://admin.google.com as an administrator
Select Apps
Select Google Workspace
Select Calendar
Under Sharing settings, select External sharing options for primary calendars
Ensure Only free/busy information (hide event details) is selected

Expected Result

Only free/busy information (hide event details) should be selected for external sharing options for primary calendars.

Remediation

To configure this setting via the Google Workspace Admin Console:

Log in to https://admin.google.com as an administrator
Select Apps
Select Google Workspace
Select Calendar
Under Sharing settings, select External sharing options for primary calendars
Select Only free/busy information (hide event details)
Select Save

Default Value

External sharing options for primary calendars is Only free/busy information (hide event details)

References

https://support.google.com/a/answer/60765

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	x	x	x
v7	14.6 Protect Information through Access Control Lists	x	x	x

Profile

Enterprise Level 1