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Showing SKILL.md
| name | cis-ubuntu1804-v220-1-8-4 |
| description | Ensure GDM screen locks when the user is idle |
| category | cis-networking |
| version | 2.2.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-18.04","gdm","gnome","screen-lock","idle","dconf"] |
| cis_id | 1.8.4 |
| cis_benchmark | CIS Ubuntu Linux 18.04 LTS Benchmark v2.2.0 |
| tech_stack | ["ubuntu","linux"] |
| cwe_ids | [] |
| chains_with | [] |
| prerequisites | [] |
| severity_boost | {} |
GNOME Desktop Manager can make the screen lock automatically whenever the user is idle for some amount of time.
idle-delay=uint32 {n} - Number of seconds of inactivity before the screen goes blanklock-delay=uint32 {n} - Number of seconds after the screen is blank before locking the screenExample key file:
# Specify the dconf path
[org/gnome/desktop/session]
# Number of seconds of inactivity before the screen goes blank
# Set to 0 seconds if you want to deactivate the screensaver.
idle-delay=uint32 900
# Specify the dconf path
[org/gnome/desktop/screensaver]
# Number of seconds after the screen is blank before locking the screen
lock-delay=uint32 5
Setting a lock-out value reduces the window of opportunity for unauthorized user access to another user's session that has been left unattended.
Run the following script to verify that the screen locks when the user is idle:
#!/usr/bin/env bash
{
# Check if GNOME Desktop Manager is installed. If package isn't installed, recommendation is Not Applicable\n
# determine system's package manager
l_pkgoutput=""
if command -v dpkg-query > /dev/null 2>&1; then
l_pq="dpkg-query -s"
elif command -v rpm > /dev/null 2>&1; then
l_pq="rpm -q"
fi
# Check if GDM is installed
l_pcl="gdm gdm3" # Space separated list of packages to check
for l_pn in $l_pcl; do
$l_pq "$l_pn" > /dev/null 2>&1 && l_pkgoutput="\n - Package: \"\" exists on the system\n - checking configuration"
[ -n ];
l_output= l_output2=
l_idmv=
l_ldmv=
l_kfile=
[ -n ];
l_profile=.
l_pdbdir=
l_idv=
[ -n ];
[ -gt -a -le ] && l_output=
[ = ] && l_output2=
[ -gt ] && l_output2=
l_output2=
l_ldv=
[ -n ];
[ -ge -a -le ] && l_output=
[ -gt ] && l_output2=
l_output2=
grep -Psq /etc/dconf/profile/*;
l_output=
l_output2=
[ -f ];
l_output=
l_output2=
l_output2=
l_output=
[ -n ] && -e
[ -z ];
-e
-e
[ -n ] && -e
}
idle-delay=uint32 Should be 900 seconds (15 minutes) or less, not 0 (disabled) and follow local site policylock-delay=uint32 should be 5 seconds or less and follow local site policyCreate or edit a file in the /etc/dconf/profile/ and verify it includes the following:
user-db:user
system-db:{NAME_OF_DCONF_DATABASE}
Note: local is the name of a dconf database used in the examples.
Example:
echo -e '\nuser-db:user\nsystem-db:local' >> /etc/dconf/profile/user
Create the directory /etc/dconf/db/{NAME_OF_DCONF_DATABASE}.d/ if it doesn't already exist:
Example:
mkdir /etc/dconf/db/local.d
Create the key file /etc/dconf/db/{NAME_OF_DCONF_DATABASE}.d/{FILE_NAME} to provide information for the {NAME_OF_DCONF_DATABASE} database:
Example script:
#!/usr/bin/env bash
{
l_key_file="/etc/dconf/db/local.d/00-screensaver"
l_idmv="900" # Set max value for idle-delay in seconds (between 1 and 900)
l_ldmv="5" # Set max value for lock-delay in seconds (between 0 and 5)
{
echo '# Specify the dconf path'
echo '[org/gnome/desktop/session]'
echo ''
echo '# Number of seconds of inactivity before the screen goes blank'
echo '# Set to 0 seconds if you want to deactivate the screensaver.'
echo "idle-delay=uint32 $l_idmv"
echo ''
echo '# Specify the dconf path'
echo '[org/gnome/desktop/screensaver]'
echo ''
echo '# Number of seconds after the screen is blank before locking the screen'
echo "lock-delay=uint32 $l_ldmv"
} > "$l_key_file"
}
Note: You must include the uint32 along with the integer key values as shown.
Run the following command to update the system databases:
dconf update
Note: Users must log out and back in again before the system-wide settings take effect.
| Controls Version | Control | IG 1 | IG 2 | IG 3 |
|---|---|---|---|---|
| v8 | 4.3 Configure Automatic Session Locking on Enterprise Assets | X | X | X |
| v7 | 16.11 Lock Workstation Sessions After Inactivity | X | X | X |
| Techniques / Sub-techniques | Tactics | Mitigations |
|---|---|---|
| T1461 | TA0027 | M1012 |