This is what I would change it to to get it to work.

The %param are the variables you are passing to the search.php3 script. search is, a no brainer, what you are looking for and search_query is the types. I got these from looking at the code on there search page.

Enjoy.

use warnings;
use strict;

use LWP::Simple;
use LWP::UserAgent;

my $ua = new LWP::UserAgent;

print "Content-type: text/html\n\n";

# Create a request
my %param;
$param{'search'} = 'GD';
$param{'search_query'} = 'name';
my $res = $ua->post('http://cgi.nessus.org/plugins/search.php3', \%par
+am);

# Check the outcome of the response
if ($res->is_success) {
        print $res->content;
} else {
        print "No response\n";
}
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