时间:2015-1-18 作者:admin 分类: 技术交流
虽然验证码进行了加密,但是逻辑上还有点问题
问题出在
..\includes\cls_captcha.php
通过验证函数可以看到直接返回,并没有对验证失败进行处理
function check_word($word) { $recorded = isset($_SESSION[$this->session_word]) ? base64_decode($_SESSION[$this->session_word]) : ''; $given = $this->encrypts_word(strtoupper($word)); //MD5加密处理 return (preg_match("/$given/", $recorded)); //验证规则 }
也就是说如果登陆失败的时候没有对验证码SESSION置空的话,就可以在这次请求中反复尝试进行破解。
下面代码可以看到并没有对验证错误的时候进行处理
..\ecshop\admin\privilege.php
if (intval($_CFG['captcha']) & CAPTCHA_ADMIN) { include_once(ROOT_PATH . 'includes/cls_captcha.php'); /* 检查验证码是否正确 */ $validator = new captcha(); if (!empty($_POST['captcha']) && !$validator->check_word($_POST['captcha'])) { sys_msg($_LANG['captcha_error'], 1); } } $_POST['username'] = isset($_POST['username']) ? trim($_POST['username']) : ''; $_POST['password'] = isset($_POST['password']) ? trim($_POST['password']) : ''; $sql="SELECT `ec_salt` FROM ". $ecs->table('admin_user') ."WHERE user_name = '" . $_POST['username']."'"; echo $sql."<br/>"; $ec_salt =$db->getOne($sql); if(!empty($ec_salt)) { /* 检查密码是否正确 */ $sql = "SELECT user_id, user_name, password, last_login, action_list, last_login,suppliers_id,ec_salt". " FROM " . $ecs->table('admin_user') . " WHERE user_name = '" . $_POST['username']. "' AND password = '" . md5(md5($_POST['password']).$ec_salt) . "'"; } else { /* 检查密码是否正确 */ $sql = "SELECT user_id, user_name, password, last_login, action_list, last_login,suppliers_id,ec_salt". " FROM " . $ecs->table('admin_user') . " WHERE user_name = '" . $_POST['username']. "' AND password = '" . md5($_POST['password']) . "'"; } $row = $db->getRow($sql); if ($row) {....}