关于 Register Globals开启后会遇到的有关问题
关于 Register Globals开启后会遇到的问题
我看了php手册上面说全局变量是建议关闭的,即把regester_globales设置成off
而且手册还举了一个例子,说明如果不关掉会有什么问题,例子如下,但是其中后面的解释部分
的GET auth.php?authorized=1 不知道是什么意思???希望大家帮帮我
错误使用 register_globals = on 的例子
// 当用户合法的时候,赋值 $authorized = true
if (authenticated_user()) {
$authorized = true;
}
// 由于并没有事先把 $authorized 初始化为 false,
// 当 register_globals 打开时,可能通过GET auth.php?authorized=1 来定义该变量值
// 所以任何人都可以绕过身份验证
if ($authorized) {
include "/highly/sensitive/data.php";
}
?>
当 register_globals = on 的时候,上面的代码就会有危险了。如果是 off,$authorized 就不能通过如 URL 请求等方式来改变,这样就好多了,尽管初始化变量是一个良好的编程习惯。比如说,如果在上面的代码执行之前加入 $authorized = false 的话,无论 register_globals 是 on 还是 off 都可以,因为用户状态被初始化为未经认证。
------解决方案--------------------
当 regester_globales 开启时 在auth.php?authorized=1 文件中取authorized 就不一定要用GET
$authorized 就等于 $_GET['authorized']
我通过url就能定义你的变量 这还安全吗?
http://bbs.php100.com/read-htm-tid-17163-page-1.html
http://www.laruence.com/2009/07/13/976.html
这是另一个例子
------解决方案--------------------
这个注释说的比较清楚了
// 由于并没有事先把 $authorized 初始化为 false,
// 当 register_globals 打开时,可能通过GET auth.php?authorized=1 来定义该变量值
// 所以任何人都可以绕过身份验证
if ($authorized) {
include "/highly/sensitive/data.php";
}
如果你打开了那个设置,并且通过判断变量 authorized是否为true 的时候为允许 那么只需要在url 构造 authorized=1 即可得到 authorized 为true 的权限。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics

In this chapter, we will understand the Environment Variables, General Configuration, Database Configuration and Email Configuration in CakePHP.

PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

To work with date and time in cakephp4, we are going to make use of the available FrozenTime class.

To work on file upload we are going to use the form helper. Here, is an example for file upload.

In this chapter, we are going to learn the following topics related to routing ?

CakePHP is an open-source framework for PHP. It is intended to make developing, deploying and maintaining applications much easier. CakePHP is based on a MVC-like architecture that is both powerful and easy to grasp. Models, Views, and Controllers gu

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

Validator can be created by adding the following two lines in the controller.
