register_globals（Register_Globals – A Security Risk）

作者：双枪栏目：春季菜谱2023-07-10 10:24:1286489
Register_Globals – A Security Risk? Register_globals is a setting in PHP that allows variables to be automatically registered in the global scope of the script. This feature can cause security issues and is considered a deprecated feature that was removed in PHP 5.4. This article explores the security risks of using register_globals and why it is no longer recommended for modern PHP programming. Potential Security Risks One of the main issues with register_globals is that it can make code vulnerable to a type of attack called “register_globals exploit.” In this attack, an attacker can manipulate the global variables of a script by sending specially crafted HTTP requests. This can allow them to modify variables, read sensitive information, and even execute arbitrary code. Another potential security risk associated with register_globals is that it can create variable conflicts. If two variables with the same name are included in the global scope, it can be difficult to determine which variable is being referred to. This can lead to unexpected behavior and even crashes. Best Practices for Security To prevent register_globals exploit attacks and other security risks, it is recommended to turn off register_globals in PHP configuration files. This setting can be changed by modifying the php.ini file or by using the .htaccess file. The recommended configuration is: register_globals = Off Using other methods for handling variables, such as the $_POST, $_GET, or $_COOKIE global arrays, is also recommended. By using these arrays, variables can be explicitly defined and accessed only when necessary, reducing the risk of conflicts and manipulation by attackers. Register_globals and Modern PHP Programming Since PHP 5.4, register_globals has been deprecated and is no longer included in the language. This means that the setting is no longer supported and is not included in more recent versions of PHP. Despite this, there are still some legacy applications and scripts that rely on register_globals, making them vulnerable to security risks. In conclusion, it is important to understand the potential security risks associated with register_globals and to take appropriate measures to prevent them. By turning off this feature and using safer variable handling techniques, developers can ensure the security and reliability of their PHP scripts. References: “PHP: The Right Way.” The Right Way, phptherightway.com/#register_globals. “PHP Manual.” PHP: Hypertext Preprocessor, www.php.net/manual/en/security.globals.php.
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