No, Term::ReadKey is as portable as it gets.

E:\>perldoc -q password
Found in C:\Perl\lib\pod\perlfaq8.pod
  How do I ask the user for a password?
    (This question has nothing to do with the web. See a different FAQ
+ for
    that.)

    There's an example of this in "crypt" in perlfunc). First, you put
+ the
    terminal into "no echo" mode, then just read the password normally
+. You
    may do this with an old-style ioctl() function, POSIX terminal con
+trol
    (see POSIX or its documentation the Camel Book), or a call to the 
+stty
    program, with varying degrees of portability.

    You can also do this for most systems using the Term::ReadKey modu
+le
    from CPAN, which is easier to use and in theory more portable.

        use Term::ReadKey;

        ReadMode('noecho');
        $password = ReadLine(0);
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