Index: sudo-1.8.28/plugins/sudoers/sudoers.in
===================================================================
--- sudo-1.8.28.orig/plugins/sudoers/sudoers.in	2019-10-14 17:00:02.176362373 +0200
+++ sudo-1.8.28/plugins/sudoers/sudoers.in	2019-10-14 17:00:04.688378325 +0200
@@ -32,30 +32,23 @@
 ##
 ## Defaults specification
 ##
-## You may wish to keep some of the following environment variables
-## when running commands via sudo.
-##
-## Locale settings
-# Defaults env_keep += "LANG LANGUAGE LINGUAS LC_* _XKB_CHARSET"
-##
-## Run X applications through sudo; HOME is used to find the
-## .Xauthority file.  Note that other programs use HOME to find   
-## configuration files and this may lead to privilege escalation!
-# Defaults env_keep += "HOME"
-##
-## X11 resource path settings
-# Defaults env_keep += "XAPPLRESDIR XFILESEARCHPATH XUSERFILESEARCHPATH"
-##
-## Desktop path settings
-# Defaults env_keep += "QTDIR KDEDIR"
-##
-## Allow sudo-run commands to inherit the callers' ConsoleKit session
-# Defaults env_keep += "XDG_SESSION_COOKIE"
-##
-## Uncomment to enable special input methods.  Care should be taken as
-## this may allow users to subvert the command being run via sudo.
-# Defaults env_keep += "XMODIFIERS GTK_IM_MODULE QT_IM_MODULE QT_IM_SWITCHER"
-##
+## Prevent environment variables from influencing programs in an
+## unexpected or harmful way (CVE-2005-2959, CVE-2005-4158, CVE-2006-0151)
+Defaults always_set_home
+## Path that will be used for every command run from sudo
+Defaults secure_path="/usr/sbin:/usr/bin:/sbin:/bin"
+Defaults env_reset
+## Change env_reset to !env_reset in previous line to keep all environment variables
+## Following list will no longer be necessary after this change
+Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_ATIME LC_ALL LANGUAGE LINGUAS XDG_SESSION_COOKIE"
+## Comment out the preceding line and uncomment the following one if you need
+## to use special input methods. This may allow users to compromise the root
+## account if they are allowed to run commands without authentication.
+#Defaults env_keep = "LANG LC_ADDRESS LC_CTYPE LC_COLLATE LC_IDENTIFICATION LC_MEASUREMENT LC_MESSAGES LC_MONETARY LC_NAME LC_NUMERIC LC_PAPER LC_TELEPHONE LC_ATIME LC_ALL LANGUAGE LINGUAS XDG_SESSION_COOKIE"
+
+## Do not insult users when they enter an incorrect password.
+Defaults !insults
+
 ## Uncomment to use a hard-coded PATH instead of the user's to find commands
 # Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin"
 ##
@@ -66,9 +59,15 @@
 ## sudoreplay and reboot.  Use sudoreplay to play back logged sessions.
 # Defaults log_output
 # Defaults!/usr/bin/sudoreplay !log_output
-# Defaults!/usr/local/bin/sudoreplay !log_output
 # Defaults!REBOOT !log_output
 
+## In the default (unconfigured) configuration, sudo asks for the root password.
+## This allows use of an ordinary user account for administration of a freshly
+## installed system. When configuring sudo, delete the two
+## following lines:
+Defaults targetpw   # ask for the password of the target user i.e. root
+ALL   ALL=(ALL) ALL   # WARNING! Only use this together with 'Defaults targetpw'!
+
 ##
 ## Runas alias specification
 ##
@@ -84,14 +83,6 @@ root ALL=(ALL) ALL
 ## Same thing without a password
 # %wheel ALL=(ALL) NOPASSWD: ALL
 
-## Uncomment to allow members of group sudo to execute any command
-# %sudo	ALL=(ALL) ALL
-
-## Uncomment to allow any user to run sudo if they know the password
-## of the user they are running the command as (root by default).
-# Defaults targetpw  # Ask for the password of the target user
-# ALL ALL=(ALL) ALL  # WARNING: only use this together with 'Defaults targetpw'
-
 ## Read drop-in files from @sysconfdir@/sudoers.d
 ## (the '#' here does not indicate a comment)
 #includedir @sysconfdir@/sudoers.d
Index: sudo-1.8.28/doc/sudoers.mdoc.in
===================================================================
--- sudo-1.8.28.orig/doc/sudoers.mdoc.in	2019-10-14 17:00:02.176362373 +0200
+++ sudo-1.8.28/doc/sudoers.mdoc.in	2019-10-14 17:03:30.841685660 +0200
@@ -1972,7 +1972,7 @@ is present in the
 .Em env_keep
 list, both of which are strongly discouraged.
 This flag is
-.Em off
+.Em on
 by default.
 .It authenticate
 If set, users must authenticate themselves via a password (or other
@@ -2364,7 +2364,7 @@ If set,
 .Nm sudo
 will insult users when they enter an incorrect password.
 This flag is
-.Em @insults@
+.Em off
 by default.
 .It log_host
 If set, the host name will be logged in the (non-syslog)
@@ -2941,7 +2941,7 @@ database as an argument to the
 .Fl u
 option.
 This flag is
-.Em off
+.Em on
 by default.
 .It tty_tickets
 If set, users must authenticate on a per-tty basis.