After reading the replies, I decided to test the $CGI::POST_MAX values. This is supposed to prevent DoS attacks by limiting the size of POST data, but I can't tell that changing the value makes any difference. My question now is, what is the expected behaviour if $POST_MAX is exceeded and everything works as it should? For instance, the following code executes with no warnings or errors:

display form

#!/usr/local/bin/perl
use strict;
use warnings;
use CGI;

$CGI::DISABLE_UPLOADS = 1; # Disable uploads
$CGI::POST_MAX        = 0; # Maximum number of bytes per post

my $cgi = CGI->new();

print $cgi->header();
print "
<html>
   <body>
   <form method='post' action='posttest.pl'>
      Username <input type='text' name='uid' size='15' value=''>
      <br><br>
      Password <input type='password' name='passwd' size='10' value=''
+>
      <br><br>
      <input type='hidden' name='rm' value='test'>
      <input type='submit' name='submit'>
   </form>
   </body>
</html>
";

[download]

parse form

#!/usr/local/bin/perl
use strict;
use warnings;
use CGI;

$CGI::DISABLE_UPLOADS = 1; # Disable uploads
$CGI::POST_MAX        = 0; # Maximum number of bytes per post

my $cgi = CGI->new();

my $uid    = $cgi->param('uid');
my $passwd = $cgi->param('passwd');
my $rm     = $cgi->param('rm');

print $cgi->header, $cgi->start_html;

print "uid: '"    . $cgi->param('uid')    . "<br>";
print "passwd: '" . $cgi->param('passwd') . "<br>";
print "rm: '"     . $cgi->param('rm')     . "'";

[download]

In reply to Re: CGI::Application and CGI security by Anonymous Monk
in thread CGI::Application and CGI security by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.