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system_settings_hot_corners_secure Secure Hot Corners

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

Title

Secure Hot Corners

Control

bl_corner="$(/usr/bin/defaults read /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-bl-corner 2>/dev/null)"
tl_corner="$(/usr/bin/defaults read /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-tl-corner 2>/dev/null)"
tr_corner="$(/usr/bin/defaults read /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-tr-corner 2>/dev/null)"
br_corner="$(/usr/bin/defaults read /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-br-corner 2>/dev/null)"

if [[ "$bl_corner" != "6" ]] && [[ "$tl_corner" != "6" ]] && [[ "$tr_corner" != "6" ]] && [[ "$br_corner" != "6" ]]; then
echo "0"
fi

Discussion

Hot corners _MUST_ be secured.

The information system conceals, via the session lock, information previously visible on the display with a publicly viewable image. Although hot comers can be used to initiate a session lock or to launch useful applications, they can also be configured to disable an automatic session lock from initiating. Such a configuration introduces the risk that a user might forget to manually lock the screen before stepping away from the computer.

[NOTE]
====
The check and fix are for the last logged in user. To get the last logged in user, run the following.
[source,bash]
----
CURRENT_USER=$( /usr/bin/defaults read /Library/Preferences/com.apple.loginwindow lastUserName )
----
====

Related controls

ac-11.1

Fix

[source,bash]
----
/usr/bin/sudo -u "$CURRENT_USER" /usr/bin/defaults delete /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-bl-corner 2>/dev/null
/usr/bin/sudo -u "$CURRENT_USER" /usr/bin/defaults delete /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-tl-corner 2>/dev/null
/usr/bin/sudo -u "$CURRENT_USER" /usr/bin/defaults delete /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-tr-corner 2>/dev/null
/usr/bin/sudo -u "$CURRENT_USER" /usr/bin/defaults delete /Users/"$CURRENT_USER"/Library/Preferences/com.apple.dock wvous-br-corner 2>/dev/null
----