diff --git a/advanced/Scripts/list.sh b/advanced/Scripts/list.sh
index c1d95aae..e0455e0c 100755
--- a/advanced/Scripts/list.sh
+++ b/advanced/Scripts/list.sh
@@ -92,11 +92,13 @@ PoplistFile() {
     # Check whitelist file exists, and if not, create it
     if [[ ! -f "${whitelist}" ]]; then
         touch "${whitelist}"
+        chmod a+r "${whitelist}"
     fi
 
     # Check blacklist file exists, and if not, create it
     if [[ ! -f "${blacklist}" ]]; then
         touch "${blacklist}"
+        chmod a+r "${blacklist}"
     fi
 
     for dom in "${domList[@]}"; do
@@ -239,9 +241,10 @@ Displaylist() {
 NukeList() {
     if [[ -f "${listMain}" ]]; then
         # Back up original list
-        cp "${listMain}" "${listMain}.bck~"
+        cp -p "${listMain}" "${listMain}.bck~"
         # Empty out file
         echo "" > "${listMain}"
+        chmod a+r "${listMain}"
     fi
 }
 
diff --git a/advanced/Scripts/piholeCheckout.sh b/advanced/Scripts/piholeCheckout.sh
index 1bfe5e21..a982289f 100644
--- a/advanced/Scripts/piholeCheckout.sh
+++ b/advanced/Scripts/piholeCheckout.sh
@@ -90,6 +90,7 @@ checkout() {
         local path
         path="development/${binary}"
         echo "development" > /etc/pihole/ftlbranch
+        chmod a+r /etc/pihole/ftlbranch
     elif [[ "${1}" == "master" ]] ; then
         # Shortcut to check out master branches
         echo -e "  ${INFO} Shortcut \"master\" detected - checking out master branches..."
@@ -104,6 +105,7 @@ checkout() {
         local path
         path="master/${binary}"
         echo "master" > /etc/pihole/ftlbranch
+        chmod a+r /etc/pihole/ftlbranch
     elif [[ "${1}" == "core" ]] ; then
         str="Fetching branches from ${piholeGitUrl}"
         echo -ne "  ${INFO} $str"
@@ -166,6 +168,7 @@ checkout() {
         if check_download_exists "$path"; then
             echo "  ${TICK} Branch ${2} exists"
             echo "${2}" > /etc/pihole/ftlbranch
+            chmod a+r /etc/pihole/ftlbranch
             FTLinstall "${binary}"
             restart_service pihole-FTL
             enable_service pihole-FTL
diff --git a/advanced/Scripts/piholeLogFlush.sh b/advanced/Scripts/piholeLogFlush.sh
index 561fbce7..1e4b7abe 100755
--- a/advanced/Scripts/piholeLogFlush.sh
+++ b/advanced/Scripts/piholeLogFlush.sh
@@ -39,8 +39,9 @@ if [[ "$@" == *"once"* ]]; then
         # Note that moving the file is not an option, as
         # dnsmasq would happily continue writing into the
         # moved file (it will have the same file handler)
-        cp /var/log/pihole.log /var/log/pihole.log.1
+        cp -p /var/log/pihole.log /var/log/pihole.log.1
         echo " " > /var/log/pihole.log
+        chmod a+r /var/log/pihole.log
     fi
 else
     # Manual flushing
@@ -53,6 +54,7 @@ else
         echo " " > /var/log/pihole.log
         if [ -f /var/log/pihole.log.1 ]; then
             echo " " > /var/log/pihole.log.1
+            chmod a+r /var/log/pihole.log.1
         fi
     fi
     # Delete most recent 24 hours from FTL's database, leave even older data intact (don't wipe out all history)
diff --git a/advanced/Scripts/updatecheck.sh b/advanced/Scripts/updatecheck.sh
index 257c1929..55fce328 100755
--- a/advanced/Scripts/updatecheck.sh
+++ b/advanced/Scripts/updatecheck.sh
@@ -51,6 +51,7 @@ if [[ "$2" == "remote" ]]; then
 
     GITHUB_CORE_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/pi-hole/releases/latest' 2> /dev/null)")"
     echo -n "${GITHUB_CORE_VERSION}" > "${GITHUB_VERSION_FILE}"
+    chmod a+r "${GITHUB_VERSION_FILE}"
 
     if [[ "${INSTALL_WEB_INTERFACE}" == true ]]; then
         GITHUB_WEB_VERSION="$(json_extract tag_name "$(curl -s 'https://api.github.com/repos/pi-hole/AdminLTE/releases/latest' 2> /dev/null)")"
@@ -66,6 +67,7 @@ else
 
     CORE_BRANCH="$(get_local_branch /etc/.pihole)"
     echo -n "${CORE_BRANCH}" > "${LOCAL_BRANCH_FILE}"
+    chmod a+r "${LOCAL_BRANCH_FILE}"
 
     if [[ "${INSTALL_WEB_INTERFACE}" == true ]]; then
         WEB_BRANCH="$(get_local_branch /var/www/html/admin)"
@@ -79,6 +81,7 @@ else
 
     CORE_VERSION="$(get_local_version /etc/.pihole)"
     echo -n "${CORE_VERSION}" > "${LOCAL_VERSION_FILE}"
+    chmod a+r "${LOCAL_VERSION_FILE}"
 
     if [[ "${INSTALL_WEB_INTERFACE}" == true ]]; then
         WEB_VERSION="$(get_local_version /var/www/html/admin)"
diff --git a/advanced/Scripts/webpage.sh b/advanced/Scripts/webpage.sh
index c6852896..eba539a6 100755
--- a/advanced/Scripts/webpage.sh
+++ b/advanced/Scripts/webpage.sh
@@ -322,6 +322,7 @@ dhcp-option=option:router,${DHCP_ROUTER}
 dhcp-leasefile=/etc/pihole/dhcp.leases
 #quiet-dhcp
 " > "${dhcpconfig}"
+    chmod a+r "${dhcpconfig}"
 
     if [[ "${PIHOLE_DOMAIN}" != "none" ]]; then
         echo "domain=${PIHOLE_DOMAIN}" >> "${dhcpconfig}"
@@ -541,11 +542,13 @@ addAudit()
     do
         echo "${var}" >> /etc/pihole/auditlog.list
     done
+    chmod a+r /etc/pihole/auditlog.list
 }
 
 clearAudit()
 {
     echo -n "" > /etc/pihole/auditlog.list
+    chmod a+r /etc/pihole/auditlog.list
 }
 
 SetPrivacyLevel() {
diff --git a/automated install/basic-install.sh b/automated install/basic-install.sh
index 94377647..2d85d854 100755
--- a/automated install/basic-install.sh	
+++ b/automated install/basic-install.sh	
@@ -194,7 +194,7 @@ if is_command apt-get ; then
             exit # exit the installer
         else
             printf "  %b Enabling universe package repository for Ubuntu Bionic\\n" "${INFO}"
-            cp ${APT_SOURCES} ${APT_SOURCES}.backup # Backup current repo list
+            cp -p ${APT_SOURCES} ${APT_SOURCES}.backup # Backup current repo list
             printf "  %b Backed up current configuration to %s\\n" "${TICK}" "${APT_SOURCES}.backup"
             add-apt-repository universe
             printf "  %b Enabled %s\\n" "${TICK}" "'universe' repository"
@@ -847,7 +847,7 @@ setIFCFG() {
         # Put the IP in variables without the CIDR notation
         printf -v CIDR "%s" "${IPV4_ADDRESS##*/}"
         # Backup existing interface configuration:
-        cp "${IFCFG_FILE}" "${IFCFG_FILE}".pihole.orig
+        cp -p "${IFCFG_FILE}" "${IFCFG_FILE}".pihole.orig
         # Build Interface configuration file using the GLOBAL variables we have
         {
         echo "# Configured via Pi-hole installer"
@@ -1241,7 +1241,8 @@ version_check_dnsmasq() {
             printf "%b  %b Backing up dnsmasq.conf to dnsmasq.conf.orig...\\n" "${OVER}"  "${TICK}"
             printf "  %b Restoring default dnsmasq.conf..." "${INFO}"
             # and replace it with the default
-            cp ${dnsmasq_original_config} ${dnsmasq_conf}
+            cp -p ${dnsmasq_original_config} ${dnsmasq_conf}
+            chmod a+r ${dnsmasq_conf}
             printf "%b  %b Restoring default dnsmasq.conf...\\n" "${OVER}"  "${TICK}"
         # Otherwise,
         else
@@ -1252,7 +1253,7 @@ version_check_dnsmasq() {
         # If a file cannot be found,
         printf "  %b No dnsmasq.conf found... restoring default dnsmasq.conf..." "${INFO}"
         # restore the default one
-        cp ${dnsmasq_original_config} ${dnsmasq_conf}
+        cp -p ${dnsmasq_original_config} ${dnsmasq_conf}
         printf "%b  %b No dnsmasq.conf found... restoring default dnsmasq.conf...\\n" "${OVER}"  "${TICK}"
     fi
 
@@ -1260,9 +1261,11 @@ version_check_dnsmasq() {
     # Check to see if dnsmasq directory exists (it may not due to being a fresh install and dnsmasq no longer being a dependency)
     if [[ ! -d "/etc/dnsmasq.d"  ]];then
         mkdir "/etc/dnsmasq.d"
+        chmod 755 "/etc/dnsmasq.d"
     fi
     # Copy the new Pi-hole DNS config file into the dnsmasq.d directory
     cp ${dnsmasq_pihole_01_snippet} ${dnsmasq_pihole_01_location}
+    chmod a+r ${dnsmasq_pihole_01_location}
     printf "%b  %b Copying 01-pihole.conf to /etc/dnsmasq.d/01-pihole.conf\\n" "${OVER}"  "${TICK}"
     # Replace our placeholder values with the GLOBAL DNS variables that we populated earlier
     # First, swap in the interface to listen on
@@ -1382,6 +1385,7 @@ installConfigs() {
             mkdir /etc/lighttpd
             # and set the owners
             chown "${USER}":root /etc/lighttpd
+            chmod 755 /etc/lighttpd
         # Otherwise, if the config file already exists
         elif [[ -f "/etc/lighttpd/lighttpd.conf" ]]; then
             # back up the original
@@ -1389,8 +1393,10 @@ installConfigs() {
         fi
         # and copy in the config file Pi-hole needs
         cp ${PI_HOLE_LOCAL_REPO}/advanced/${LIGHTTPD_CFG} /etc/lighttpd/lighttpd.conf
+        chmod a+r /etc/lighttpd/lighttpd.conf
         # Make sure the external.conf file exists, as lighttpd v1.4.50 crashes without it
         touch /etc/lighttpd/external.conf
+        chmod a+r /etc/lighttpd/external.conf
         # if there is a custom block page in the html/pihole directory, replace 404 handler in lighttpd config
         if [[ -f "${PI_HOLE_BLOCKPAGE_DIR}/custom.php" ]]; then
             sed -i 's/^\(server\.error-handler-404\s*=\s*\).*$/\1"pihole\/custom\.php"/' /etc/lighttpd/lighttpd.conf
@@ -1422,15 +1428,26 @@ install_manpage() {
     if [[ ! -d "/usr/local/share/man/man8" ]]; then
         # if not present, create man8 directory
         mkdir /usr/local/share/man/man8
+        chown root:staff /usr/local/share/man/man8
+        chmod a+r /usr/local/share/man/man8
+        chmod a+x /usr/local/share/man/man8
+        chmod g+s /usr/local/share/man/man8
     fi
     if [[ ! -d "/usr/local/share/man/man5" ]]; then
-        # if not present, create man8 directory
+        # if not present, create man5 directory
         mkdir /usr/local/share/man/man5
+        chown root:staff /usr/local/share/man/man5
+        chmod a+r /usr/local/share/man/man5
+        chmod a+x /usr/local/share/man/man5
+        chmod g+s /usr/local/share/man/man5
     fi
     # Testing complete, copy the files & update the man db
     cp ${PI_HOLE_LOCAL_REPO}/manpages/pihole.8 /usr/local/share/man/man8/pihole.8
+    chmod a+r /usr/local/share/man/man8/pihole.8
     cp ${PI_HOLE_LOCAL_REPO}/manpages/pihole-FTL.8 /usr/local/share/man/man8/pihole-FTL.8
+    chmod a+r /usr/local/share/man/man8/pihole-FTL.8
     cp ${PI_HOLE_LOCAL_REPO}/manpages/pihole-FTL.conf.5 /usr/local/share/man/man5/pihole-FTL.conf.5
+    chmod a+r /usr/local/share/man/man5/pihole-FTL.conf.5
     if mandb -q &>/dev/null; then
         # Updated successfully
         printf "%b  %b man pages installed and database updated\\n" "${OVER}" "${TICK}"
@@ -1711,6 +1728,9 @@ installCron() {
     printf "\\n  %b %s..." "${INFO}" "${str}"
     # Copy the cron file over from the local repo
     cp ${PI_HOLE_LOCAL_REPO}/advanced/Templates/pihole.cron /etc/cron.d/pihole
+    # File must not be world or group writeable and must be owned by root
+    chmod 644 /etc/cron.d/pihole
+    chown root:root /etc/cron.d/pihole
     # Randomize gravity update time
     sed -i "s/59 1 /$((1 + RANDOM % 58)) $((3 + RANDOM % 2))/" /etc/cron.d/pihole
     # Randomize update checker time
@@ -1818,6 +1838,7 @@ finalExports() {
     echo "INSTALL_WEB_INTERFACE=${INSTALL_WEB_INTERFACE}"
     echo "LIGHTTPD_ENABLED=${LIGHTTPD_ENABLED}"
     }>> "${setupVars}"
+    chmod 744 "${setupVars}"
 
     # Set the privacy level
     sed -i '/PRIVACYLEVEL/d' "${PI_HOLE_CONFIG_DIR}/pihole-FTL.conf"
@@ -1841,6 +1862,7 @@ installLogrotate() {
     printf "\\n  %b %s..." "${INFO}" "${str}"
     # Copy the file over from the local repo
     cp ${PI_HOLE_LOCAL_REPO}/advanced/Templates/logrotate /etc/pihole/logrotate
+    chmod a+r /etc/pihole/logrotate
     # Different operating systems have different user / group
     # settings for logrotate that makes it impossible to create
     # a static logrotate file that will work with e.g.
@@ -2431,6 +2453,7 @@ copy_to_install_log() {
     # Copy the contents of file descriptor 3 into the install log
     # Since we use color codes such as '\e[1;33m', they should be removed
     sed 's/\[[0-9;]\{1,5\}m//g' < /proc/$$/fd/3 > "${installLogLoc}"
+    chmod a+r "${installLogLoc}"
 }
 
 main() {
@@ -2516,6 +2539,8 @@ main() {
         welcomeDialogs
         # Create directory for Pi-hole storage
         mkdir -p /etc/pihole/
+        chmod a+r /ect/pihole/
+        chmod a+x /etc/pihole/
         # Determine available interfaces
         get_available_interfaces
         # Find interfaces and let the user choose one
diff --git a/automated install/uninstall.sh b/automated install/uninstall.sh
index d0a6dcf0..732fc246 100755
--- a/automated install/uninstall.sh	
+++ b/automated install/uninstall.sh	
@@ -153,7 +153,7 @@ removeNoPurge() {
 
     # Restore Resolved
     if [[ -e /etc/systemd/resolved.conf.orig ]]; then
-        ${SUDO} cp /etc/systemd/resolved.conf.orig /etc/systemd/resolved.conf
+        ${SUDO} cp -p /etc/systemd/resolved.conf.orig /etc/systemd/resolved.conf
         systemctl reload-or-restart systemd-resolved
     fi
 
diff --git a/gravity.sh b/gravity.sh
index 015764ac..6ae0e337 100755
--- a/gravity.sh
+++ b/gravity.sh
@@ -485,6 +485,7 @@ gravity_SortAndFilterConsolidatedList() {
   fi
 
   sort -u "${piholeDir}/${parsedMatter}" > "${piholeDir}/${preEventHorizon}"
+  chmod a+r "${piholeDir}/${preEventHorizon}"
 
   if [[ "${haveSourceUrls}" == true ]]; then
     echo -e "${OVER}  ${TICK} ${str}"
@@ -509,6 +510,7 @@ gravity_Whitelist() {
 
   # Print everything from preEventHorizon into whitelistMatter EXCEPT domains in $whitelistFile
   comm -23 "${piholeDir}/${preEventHorizon}" <(sort "${whitelistFile}") > "${piholeDir}/${whitelistMatter}"
+  chmod a+r "${piholeDir}/${whitelistMatter}"
 
   echo -e "${OVER}  ${INFO} ${str}"
 }
@@ -561,6 +563,7 @@ gravity_ParseLocalDomains() {
 
   # Empty $localList if it already exists, otherwise, create it
   : > "${localList}"
+  chmod a+r "${localList}"
 
   gravity_ParseDomainsIntoHosts "${localList}.tmp" "${localList}"
 
@@ -581,8 +584,9 @@ gravity_ParseBlacklistDomains() {
     mv "${piholeDir}/${whitelistMatter}" "${piholeDir}/${accretionDisc}"
   else
     # There was no whitelist file, so use preEventHorizon instead of whitelistMatter.
-    cp "${piholeDir}/${preEventHorizon}" "${piholeDir}/${accretionDisc}"
+    cp -p "${piholeDir}/${preEventHorizon}" "${piholeDir}/${accretionDisc}"
   fi
+  chmod a+r "${piholeDir}/${accretionDisc}"
 
   # Move the file over as /etc/pihole/gravity.list so dnsmasq can use it
   output=$( { mv "${piholeDir}/${accretionDisc}" "${adList}"; } 2>&1 )
@@ -592,6 +596,7 @@ gravity_ParseBlacklistDomains() {
     echo -e "\\n  ${CROSS} Unable to move ${accretionDisc} from ${piholeDir}\\n  ${output}"
     gravity_Cleanup "error"
   fi
+  chmod a+r "${adList}"
 }
 
 # Create user-added blacklist entries
@@ -602,6 +607,7 @@ gravity_ParseUserDomains() {
   # Copy the file over as /etc/pihole/black.list so dnsmasq can use it
   cp "${blacklistFile}" "${blackList}" 2> /dev/null || \
     echo -e "\\n  ${CROSS} Unable to move ${blacklistFile##*/} to ${piholeDir}"
+  chmod a+r "${blackList}"
 }
 
 # Trap Ctrl-C
diff --git a/pihole b/pihole
index 84a5623f..59a99af1 100755
--- a/pihole
+++ b/pihole
@@ -151,10 +151,12 @@ Time:
     if [[ -e "${gravitylist}" ]]; then
       mv "${gravitylist}" "${gravitylist}.bck"
       echo "" > "${gravitylist}"
+	  chmod a+r "${gravitylist}"
     fi
     if [[ -e "${blacklist}" ]]; then
       mv "${blacklist}" "${blacklist}.bck"
       echo "" > "${blacklist}"
+	  chmod a+r "${blacklist}"
     fi
     if [[ $# > 1 ]]; then
       local error=false
@@ -206,9 +208,11 @@ Time:
 
     if [[ -e "${gravitylist}.bck" ]]; then
       mv "${gravitylist}.bck" "${gravitylist}"
+	  chmod a+r "${gravitylist}"
     fi
     if [[ -e "${blacklist}.bck" ]]; then
       mv "${blacklist}.bck" "${blacklist}"
+	  chmod a+r "${blacklist}"
     fi
     sed -i "/BLOCKING_ENABLED=/d" "${setupVars}"
     echo "BLOCKING_ENABLED=true" >> "${setupVars}"