diff --git a/core/default/etc/adduser.conf b/core/default/etc/adduser.conf
deleted file mode 100644
index 44f5404..0000000
--- a/core/default/etc/adduser.conf
+++ /dev/null
@@ -1,109 +0,0 @@
-# /etc/adduser.conf: `adduser' configuration.
-# See adduser(8) and adduser.conf(5) for full documentation.
-
-# A commented out setting indicates that this is the default in the
-# code. If you need to change those settings, remove the comment and
-# make your intended change.
-
-# STDERRMSGLEVEL, STDOUTMSGLEVEL, and LOGMSGLEVEL set the minimum
-# priority for messages logged to syslog/journal and the console,
-# respectively.
-# Values are trace, debug, info, warn, err, and fatal.
-# Messages with the set priority or higher get logged to the
-# respective medium.
-#STDERRMSGLEVEL=warn
-#STDOUTMSGLEVEL=info
-#SYSLOGLEVEL=info
-
-# The login shell to be used for all new users.
-# Default: DSHELL=/bin/bash
-#DSHELL=/bin/bash
-
-# The directory in which new home directories should  be  created.
-# Default: DHOME=/home
-# DHOME=/home
-
-# The directory from which skeletal user configuration files
-# will be copied.
-# Default: SKEL=/etc/skel
-#SKEL=/etc/skel
-
-# Specify inclusive ranges of UIDs and GIDs from which UIDs and GIDs
-# for system users, system groups, non-system users and non-system groups
-# can be dynamically allocated.
-# Default: FIRST_SYSTEM_UID=100, LAST_SYSTEM_UID=999
-#FIRST_SYSTEM_UID=100
-#LAST_SYSTEM_UID=999
-
-# Default: FIRST_SYSTEM_GID=100, LAST_SYSTEM_GID=999
-#FIRST_SYSTEM_GID=100
-#LAST_SYSTEM_GID=999
-
-# Default: FIRST_UID=1000, LAST_UID=59999
-#FIRST_UID=1000
-#LAST_UID=59999
-
-# Default: FIRST_GID=1000, LAST_GID=59999
-#FIRST_GID=1000
-#LAST_GID=59999
-
-# Specify a file or a directory containing UID and GID pool.
-#UID_POOL=/etc/adduser-pool.conf
-#UID_POOL=/etc/adduser-pool.d/
-#GID_POOL=/etc/adduser-pool.conf
-#GID_POOL=/etc/adduser-pool.d/
-
-# Specify whether each created non-system user will be
-# given their own group to use.
-# Default: USERGROUPS=yes
-#USERGROUPS=yes
-
-# Defines the groupname or GID of the group all newly-created
-# non-system users are placed into.
-# It is a configuration error to define both variables
-# even if the values are consistent.
-# Default: USERS_GID=undefined, USERS_GROUP=users
-#USERS_GID=100
-#USERS_GROUP=users
-
-# The permissions mode for home directories of non-system users.
-# Default: DIR_MODE=0750
-#DIR_MODE=0750
-
-# The permissions mode for home directories of system users.
-# Default: SYS_DIR_MODE=0750
-#SYS_DIR_MODE=0750
-
-# If set to a nonempty value, new users will have quotas copied
-# from that user with `edquota -p QUOTAUSER newuser'
-# Default: QUOTAUSER=""
-#QUOTAUSER=""
-
-# Non-system user- and groupnames are checked against this regular
-# expression.
-# Default: NAME_REGEX="^[a-z][-a-z0-9_]*\$?$"
-#NAME_REGEX="^[a-z][-a-z0-9_]*\$?$"
-
-# System user- and groupnames are checked against this regular
-# expression.
-# Default: SYS_NAME_REGEX="^[A-Za-z_][-A-Za-z0-9_]*\$?$"
-#SYS_NAME_REGEX="^[A-Za-z_][-A-Za-z0-9_]*\$?$"
-
-# When populating the newly created home directory of a non-system user,
-# files in SKEL matching this regex are not copied.
-# Default: SKEL_IGNORE_REGEX="\.(dpkg|ucf)-(old|new|dist|save)$"
-#SKEL_IGNORE_REGEX="\.(dpkg|ucf)-(old|new|dist|save)$"
-
-# list of groups that new non-system users will be added to
-# if ADD_EXTRA_GROUPS is non-zero or set on the command line.
-# Default: EXTRA_GROUPS="users"
-#EXTRA_GROUPS="users"
-
-# Setting this to something other than 0 will cause adduser to add
-# newly created non-system users to the list of groups defined by
-# EXTRA_GROUPS.
-# Default: ADD_EXTRA_GROUPS=0
-#ADD_EXTRA_GROUPS=0
-
-# use extrausers by default
-#USE_EXTRAUSERS=1
diff --git a/core/default/etc/ssh/sshd_config.d/AccessRestriction.conf b/core/default/etc/ssh/sshd_config.d/AccessRestriction.conf
deleted file mode 100644
index 3bffc5c..0000000
--- a/core/default/etc/ssh/sshd_config.d/AccessRestriction.conf
+++ /dev/null
@@ -1,11 +0,0 @@
-# Allows user 'root' to use ssh always.
-# This should prevent lockout because access is allowed without group membership.
-#    For details see: https://serverfault.com/questions/617081/how-to-use-both-allowgroups-and-allowusers-in-sshd-config 
-AllowUsers root
-# 1. Create custom group 'ssh_login' of type system if not exist:
-#    - addgroup --system "ssh_login"
-# 2. Additionally allow users of group 'ssh_login' to use ssh only:
-#    - adduser "${USER}" "ssh_login"
-Match group ssh_login
-    AllowUsers *
-    PasswordAuthentication no
diff --git a/core/default/etc/sudoers.d/allow-jenkins-updateRepositories b/core/default/etc/sudoers.d/allow-jenkins-updateRepositories
deleted file mode 100644
index 804dba5..0000000
--- a/core/default/etc/sudoers.d/allow-jenkins-updateRepositories
+++ /dev/null
@@ -1,6 +0,0 @@
-Cmnd_Alias C_JENKINS = \
-  /cis/updateRepositories.sh --core, \
-  /cis/updateRepositories.sh --scripts, \
-  /cis/updateRepositories.sh --definitions, \
-  /cis/updateRepositories.sh --states
-jenkins ALL = (root) NOPASSWD: C_JENKINS