/usr/share/perl5/Debconf/FrontEnd/ is in debconf 1.5.56+deb8u1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/perl5/Debconf/FrontEnd/Dialog.pm
/usr/share/perl5/Debconf/FrontEnd/Editor.pm
/usr/share/perl5/Debconf/FrontEnd/Gnome.pm
/usr/share/perl5/Debconf/FrontEnd/Kde/
/usr/share/perl5/Debconf/FrontEnd/Kde.pm
/usr/share/perl5/Debconf/FrontEnd/Kde/Ui_DebconfWizard.pm
/usr/share/perl5/Debconf/FrontEnd/Kde/Wizard.pm
/usr/share/perl5/Debconf/FrontEnd/Noninteractive.pm
/usr/share/perl5/Debconf/FrontEnd/Passthrough.pm
/usr/share/perl5/Debconf/FrontEnd/Readline.pm
/usr/share/perl5/Debconf/FrontEnd/ScreenSize.pm
/usr/share/perl5/Debconf/FrontEnd/Teletype.pm
/usr/share/perl5/Debconf/FrontEnd/Text.pm
/usr/share/perl5/Debconf/FrontEnd/Web.pm