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1.5.6 Ensure the Ctrl-Alt-Delete key sequence is disabled.

Information

The operating system must be configured so that the user will be prompted when Ctrl-Alt-Delete key sequence is entered.

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 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.

Solution

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

# systemctl mask ctrl-alt-del.target

If GNOME is active on the system, create a database to contain the system-wide setting (if it does not already exist) with the following command:

# touch /etc/dconf/db/local.d/00-disable-CAD

Add the setting to disable the Ctrl-Alt_Delete sequence for GNOME:

[org/gnome/settings-daemon/plugins/media-keys]
logout=''

See Also

https://workbench.cisecurity.org/benchmarks/8415

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|I, CCI|CCI-000366, CSCv7|5.1, Rule-ID|SV-204455r603261_rule, STIG-ID|RHEL-07-020230, Vuln-ID|V-204455

Plugin: Unix

Control ID: 240a48aca14a400a75f00c6a3e66ca712a5b3fecf43a731991e713e7c1c6c19f