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V-248870

CAT I (High)

The x86 Ctrl-Alt-Delete key sequence in OL 8 must be disabled if a graphical user interface is installed.

Rule ID

SV-248870r991589_rule

STIG

Oracle Linux 8 Security Technical Implementation Guide

Version

V2R8

CCIs

CCI-000366

Discussion

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.

Check Content

Verify OL 8 is not configured to reboot the system when Ctrl-Alt-Delete is pressed when using a graphical user interface with the following command: 
 
$ sudo grep logout /etc/dconf/db/local.d/* 
 
logout='' 
 
If the "logout" key is bound to an action, is commented out, or is missing, this is a finding.

Fix Text

Configure the system to disable the Ctrl-Alt-Delete sequence when using a graphical user interface by creating or editing the "/etc/dconf/db/local.d/00-disable-CAD" file. 
 
Add the setting to disable the Ctrl-Alt-Delete sequence for a graphical user interface: 
 
[org/gnome/settings-daemon/plugins/media-keys] 
logout='' 
 
Update the dconf settings: 
 
$ sudo dconf update