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The x86 Ctrl-Alt-Delete key sequence must be disabled.


Finding ID Version Rule ID IA Controls Severity
V-38668 RHEL-06-000286 SV-50469r2_rule High
A locally logged-in user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the GNOME graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2015-05-26


Check Text ( C-46228r2_chk )
To ensure the system is configured to log a message instead of rebooting the system when Ctrl-Alt-Delete is pressed, ensure the following line is in "/etc/init/control-alt-delete.override":

exec /usr/bin/logger -p security.info "Control-Alt-Delete pressed"

If the system is not configured to block the shutdown command when Ctrl-Alt-Delete is pressed, this is a finding.
Fix Text (F-43617r2_fix)
By default, the system includes the following line in "/etc/init/control-alt-delete.conf" to reboot the system when the Ctrl-Alt-Delete key sequence is pressed:

exec /sbin/shutdown -r now "Ctrl-Alt-Delete pressed"

To configure the system to log a message instead of rebooting the system, add the following line to "/etc/init/control-alt-delete.override" to read as follows:

exec /usr/bin/logger -p security.info "Ctrl-Alt-Delete pressed"