The ability to use corners to disable the screen saver must be disabled.

From MAC OSX 10.6 Workstation Security Technical Implementation Guide

Part of OSX00375-Secure screen saver corners

Associated with IA controls: PESL-1

SV-37242r1_rule The ability to use corners to disable the screen saver must be disabled.

Vulnerability discussion

A computer should require authentication when waking from sleep or screen saver. Exposé & Spaces preferences can be configured to disable the screen saver by moving the mouse cursor to a corner of the screen. Do not configure a corner to disable the screen saver.

Check content

Open System Preferences->Exposé & Spaces, Exposé pane. Ensure no corners are set to "Disable Screen saver" in the "Active Screen Corners" section for each user account. If any account is set to disable screen savers via corners, this is a finding. NOTE: Do this for each user on the system.

Fix text

Open System Preferences->Exposé & Spaces, Exposé pane. Remove any corners which are set to "Disable Screen saver" in the "Active Screen Corners" section for each user account.

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