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os_account_modification_disable Disable AppleID and Internet Account Modifications

NIST macOS Security Compliance Project Sequoia Guidance, Revision 4.0 (be5491f)
All changes in this version
first version loaded macOS

Title

Disable AppleID and Internet Account Modifications

Control

/usr/bin/osascript -l JavaScript << EOS
$.NSUserDefaults.alloc.initWithSuiteName('com.apple.applicationaccess')\
.objectForKey('allowAccountModification').js
EOS

Discussion

The system _MUST_ disable account modification.

Account modification includes adding additional or modifying internet accounts in Apple Mail, Calendar, Contacts, in the Internet Account System Setting Pane, or the AppleID System Setting Pane.

This prevents the addition of unauthorized accounts.

[IMPORTANT]
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Some organizations may allow the use and configuration of the built-in Mail.app, Calendar.app, and Contacts.app for organizational communication. Information System Security Officers (ISSOs) may make the risk-based decision not to disable the Internet Accounts System Preference pane to avoid losing this functionality, but they are advised to first fully weigh the potential risks posed to their organization.
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Related controls

ac-20, ac-20.1, cm-7, cm-7.1

Fix

This is implemented by a Configuration Profile.