The operating system must enforce requirements for remote connections to the information system.

From Apple OS X 10.9 (Mavericks) Workstation Security Technical Implementation Guide

Associated with: CCI-000366

SV-72695r1_rule The operating system must enforce requirements for remote connections to the information system.

Vulnerability discussion

The Screen Sharing feature allows remote users to view or control the desktop of the current user. A malicious user can take advantage of Screen Sharing to gain full access to the system remotely, either with stolen credentials or by guessing the username and password. Disabling Screen Sharing mitigates this risk.

Check content

To check if screen sharing is disabled, run the following command: sudo /usr/libexec/PlistBuddy -c 'print com.apple.screensharing:Disabled' /var/db/launchd.db/com.apple.launchd/overrides.plist If the returned value isn't 'true' or doesn't exist, this is a finding.

Fix text

To disable screen sharing, run the following command: sudo defaults write /private/var/db/launchd.db/com.apple.launchd/overrides.plist 'com.apple.screensharing' -dict Disabled -bool true

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