Detections
Analytics
UBTU-20-010459 - The Ubuntu operating system must disable the x86 Ctrl-Alt-Delete key sequence if a graphical user interface is installed.
Information
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 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 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 the graphical user interface:
[org/gnome/settings-daemon/plugins/media-keys]
logout=''
Update the dconf settings:
# dconf update
See Also
https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_20-04_LTS_V2R4_STIG.zip
Item Details
Audit Name: DISA Canonical Ubuntu 20.04 LTS STIG v2r4
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|I, CCI|CCI-000366, Rule-ID|SV-238379r991589_rule, STIG-ID|UBTU-20-010459, Vuln-ID|V-238379
Plugin: Unix
Control ID: a96c49e8185cb1eeebba8ba4520d1d8f06d52902015e338fdb4f8a6d3bb28a34