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
[PHP] 纯文本查看 复制代码 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/", $recorded)); //验证规则
}
也就是说如果登陆失败的时候没有对验证码SESSION置空的话,就可以在这次请求中反复尝试进行破解。
下面代码可以看到并没有对验证错误的时候进行处理
..\ecshop\admin\privilege.php
[PHP] 纯文本查看 复制代码 if (intval($_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)
{....}
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