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UBTU-16-010631 - The x86 Ctrl-Alt-Delete key sequence in the Ubuntu operating system must be disabled 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 a 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.
Note: These settings are examples using the operating system's default (GNOME) graphical user interface.
Create or edit the /etc/dconf/db/local.d/00-disable-CAD file.

Add the setting to disable the Ctrl-Alt-Delete sequence:

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

Then update the dconf settings:

# dconf update

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_16-04_LTS_V2R3_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|I, CCI|CCI-000366, Rule-ID|SV-214995r610931_rule, STIG-ID|UBTU-16-010631, STIG-Legacy|SV-95669, STIG-Legacy|V-80957, Vuln-ID|V-214995

Plugin: Unix

Control ID: 75aa1a7a1d13e579ca2fefed18534917729383f942fff97098faa0a4f3915941