Thank you for the response. No, I hadn't read that. Reading it now, however, I see that it points toward issues I do not have:

1) An issue with either SETUID or SETGID, neither of which applies to my case. This is being run as an ordinary cgi script on the server, with no special permissions.

2) An issue with the external command affecting something else external to the script. Not applicable to my use case either.

Etc.

So, what applies to my case is this:

$arg, `true`;        # Insecure (although it isn't really)

The parenthesized statement, the last in its list of examples, is what applies to me. What I am doing should not be a problem! But, I don't see in that file what I am supposed to do about this.

....WAIT....

Then I found this: 

On versions of Perl before 5.26, activating taint mode will also remov
+e the current directory (".") from the default value of @INC. Since v
+ersion 5.26, the current directory isn't included in @INC by default.

Cleaning Up Your Path

For "Insecure $ENV{PATH}" messages, you need to set $ENV{'PATH'} to a 
+known value, and each directory in the path must be absolute and non-
+writable by others than its owner and group. You may be surprised to 
+get this message even if the pathname to your executable is fully qua
+lified. This is not generated because you didn't supply a full path t
+o the program; instead, it's generated because you never set your PAT
+H environment variable, or you didn't set it to something that was sa
+fe. Because Perl can't guarantee that the executable in question isn'
+t itself going to turn around and execute some other program that is 
+dependent on your PATH, it makes sure you set the PATH.

[download]

...and I added a line to my code:

$ENV{'PATH'} = '/var/www/';

...and simple as that, the problem was solved. I guess I have heretofore been fortunate enough to work with versions of Perl before 5.26.

Blessings,

~Polyglot~

In reply to Re^2: Proper and acceptable use of backticks in a modern Perl script by Polyglot
in thread Proper and acceptable use of backticks in a modern Perl script by Polyglot

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