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os_disk_image_disable Disable Disk Images

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

Title

Disable Disk Images

Control

/usr/bin/osascript -l JavaScript << EOS
ObjC.unwrap($.NSUserDefaults.alloc.initWithSuiteName('com.apple.systemuiserver')\
.objectForKey('mount-controls'))["disk-image"]
EOS

Discussion

Disk images _MUST_ be disabled.

[IMPORTANT]
====
Some organizations rely on the use of removable media for storing and sharing data. Information System Security Officers (ISSOs) may make the risk-based decision not to disable external hard drives to avoid losing this functionality, but they are advised to first fully weigh the potential risks posed to their organization.
====

[IMPORTANT]
====
Apple has deprecated the use of link:https://github.com/apple/device-management/blob/eb51fb0cb9626cac4717858556912c257a734ce0/mdm/profiles/com.apple.systemuiserver.yaml#L4-L8[media mount controls], using these controls may not work as expected. Third party software may be required to fulfill the compliance requirements.
====

Related controls

mp-7

Fix

This is implemented by a Configuration Profile.