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1.5.22 Ensure the operating system is not configured to reboot the system when Ctrl-Alt-Delete is pressed

Information

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

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 a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In a graphical user environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.

Solution

Configure the system to disable the Ctrl-Alt-Delete sequence for the command line with the following command:

# systemctl disable ctrl-alt-del.target
# systemctl mask ctrl-alt-del.target

Created symlink /etc/systemd/system/ctrl-alt-del.target -> /dev/null

Reload the daemon for this change to take effect.

# systemctl daemon-reload

See Also

https://workbench.cisecurity.org/benchmarks/19886

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|I, Rule-ID|SV-230529r833338_rule, Vuln-ID|V-230529

Plugin: Unix

Control ID: b02772aca8a6afea368bd47bf480b65b854b48f20c3d2d755bf93d0fe747b4cd