STIGQter: STIG Summary: SUSE Linux Enterprise Server 15 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 23 Apr 2021:

The SUSE operating system must disable the x86 Ctrl-Alt-Delete key sequence for Graphical User Interfaces.

DISA Rule

SV-234989r622137_rule

Vulnerability Number

V-234989

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

SLES-15-040061

Severity

CAT I

CCI(s)

• CCI-000366 - The organization implements the security configuration settings.

Weight

10

Fix Recommendation

Configure the system to disable the Ctrl-Alt-Delete sequence for the
graphical user interface.

Create a database to contain the system-wide setting (if it does not
already exist) with the following steps:

1. Create a user profile and with the listed content:

/etc/dconf/profile/user
user-db:user
system-db:local

2. Create the following directories:

> sudo mkdir -p /etc/dconf/db/local.d/
> sudo mkdir -p /etc/dconf/db/local.d/locks/

3. Add the following files with the listed content:

/etc/dconf/db/local.d/01-fips-settings
[org/gnome/settings-daemon/plugins/media-keys]
logout=['']

/etc/dconf/db/local.d/locks/01-fips-locks
/org/gnome/settings-daemon/plugins/media-keys/logout

4. Update the dconf database:

> sudo dconf update

Check Contents

Note: If a graphical user interface is not installed, this requirement is Not Applicable.

Verify the SUSE operating system is not configured to reboot the system
when Ctrl-Alt-Delete is pressed in the graphical user interface.

Check that the dconf setting was disabled to allow the Ctrl-Alt-Delete
sequence in the graphical user interface with the following command:

Check the default logout key sequence:

> sudo gsettings get org.gnome.settings-daemon.plugins.media-keys logout
['']

Check that the value is not writable and cannot be changed by the user:

> sudo gsettings writable org.gnome.settings-daemon.plugins.media-keys logout
false

If the logout value is not [''] and the writable status is not false, this
is a finding.

Vulnerability Number

V-234989

Documentable

False

Rule Version

SLES-15-040061

Severity Override Guidance

Note: If a graphical user interface is not installed, this requirement is Not Applicable.

Verify the SUSE operating system is not configured to reboot the system
when Ctrl-Alt-Delete is pressed in the graphical user interface.

Check that the dconf setting was disabled to allow the Ctrl-Alt-Delete
sequence in the graphical user interface with the following command:

Check the default logout key sequence:

> sudo gsettings get org.gnome.settings-daemon.plugins.media-keys logout
['']

Check that the value is not writable and cannot be changed by the user:

> sudo gsettings writable org.gnome.settings-daemon.plugins.media-keys logout
false

If the logout value is not [''] and the writable status is not false, this
is a finding.

Check Content Reference

M

Target Key

5274

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