Title

The macOS system must be configured to disable the iCloud Calendar services. (Cat III impact)

Discussion

It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors. Operating systems can provide a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions). Examples of nonessential capabilities include but are not limited to games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission but that cannot be disabled. The Calendar application's connections to Apple's iCloud must be disabled. Satisfies: SRG-OS-000095-GPOS-00049, SRG-OS-000370-GPOS-00155

Check Content

Verify the macOS system is configured to disable iCloud Calendar services with the following command: /usr/sbin/system_profiler SPConfigurationProfileDataType | /usr/bin/grep "allowCloudCalendar" allowCloudCalendar = 0; If there is no result, or if "allowCloudCalendar" is not set to "0", this is a finding.

Fix Text

Configure the macOS system to disable iCloud Calendar services by installing the "Restrictions Policy" configuration profile.

Additional Identifiers

Rule ID: SV-257193r905212_rule

Vulnerability ID: V-257193

Group Title: SRG-OS-000095-GPOS-00049

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.