/etc/perl/sitecustomize.pl is in perl 5.24.1-3+deb9u5.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 | # This script is only provided as a transition mechanism for
# removing the current working directory from the library search path
# while leaving a temporary way to override this locally.
#
# If you really need "." to be on @INC globally, you can comment
# this away for now. However, please note that this facility
# is expected to be removed after the Debian stretch release,
# at which point any code in this file will not have any effect.
#
# Please see CVE-2016-1238 for background information on the risks
# of having "." on @INC.
pop @INC if $INC[-1] eq '.' and !$ENV{PERL_USE_UNSAFE_INC};
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