/usr/share/courier/webadmin/dumpenv.pl is in courier-webadmin 0.76.3-5+deb9u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 | #! /usr/bin/perl
foreach (keys %ENV)
{
my $v=$ENV{$_};
$v =~ s:\\:\\\\:g;
$v =~ s:\n:\\n:g;
print "$_=$v\n";
}
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