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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-50877	OL6-00-000286	SV-65083r4_rule		High

Description
A locally logged-on 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.

Description

A locally logged-on 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.

STIG	Date
Oracle Linux 6 Security Technical Implementation Guide	2019-03-20

Details

Check Text ( C-53349r4_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 authpriv.notice "Ctrl-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-55671r3_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 authpriv.notice "Ctrl-Alt-Delete pressed"

Fix Text (F-55671r3_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 authpriv.notice "Ctrl-Alt-Delete pressed"