They could infect users with malware, steal session cookies, and more. An attacker can use this to their advantage to run malicious javascript in the browser. Example Cross Site Scripting AttackĪ blog allows users to style their comments with HTML tags, however the script powering the blog does not strip out tags allowing any user to run javascript on the page. It is commonly used to run malicious javascript in the web browser to do attacks such as stealing session cookies among other malicious actions to gain higher level privileges in the web application. ($_SESSION + 3600))Ĭross Site Scripting is a type of vulnerability in a web application caused by the programmer not sanitizing input before outputting the input to the web browser (for example a comment on a blog). It checks the IP Address, User Agent, and if the Session Expired removing a session before it’s resumed. Below is an example implementation that can help mitigate the effects of a session hijacking attack. To defend against Session Hijacking attacks you need to check the current user’s browser and location information against information stored about the session. Defending against Session Hijacking attacks in PHP This is often used to gain access to an administrative user’s account. Session Hijacking is a vulnerability caused by an attacker gaining access to a user’s session identifier and being able to use another user’s account impersonating them. Now let's look at some common vulnerabilities in more detail. With this type of access an attacker can do very bad things. This leads to the attacker having full read and more often than not write access to the database. SQL Injection A vulnerability in the application caused by the programmer not sanitizing input before including it into a query into the database.Session Identifier Acquirement Session Identifier Acquirement is a vulnerability caused by an attacker being able to either guess the session identifier of a user or exploit vulnerabilities in the application itself or the user’s browser to obtain a session identifier.Session Hijacking A vulnerability caused by an attacker gaining access to a user’s session identifier and being able to use another user’s account impersonating them.This results in a file being pulled from a remote server and included where it should not of been. Remote File Inclusion A vulnerability in the application caused by the programmer requiring a file input provided by the user and not sanitizing the input before accessing the requested file.This results in a file being included where it should not of been. Local File Inclusion A vulnerability in the application caused by the programmer requiring a file input provided by the user and not sanitizing the input before accessing the requested file.It is commonly used to run malicious javascript in the browser to do attacks such as stealing session cookies among other malicious actions to gain higher level privileges in the application. Cross Site Scripting A vulnerability in the application caused by the programmer not sanitizing input before outputting the input to the browser (for example a comment on a blog).Cross Site Request Forgery A vulnerability in the application caused by the programmer not checking where a request was sent from - this attack is sent to a high privilege level user to gain higher level access to the application.We'll discuss a few in further depth below. These are the common vulnerabilities you'll encounter when writing PHP code. When writing PHP code it is very important to keep the following security vulnerabilities in mind to avoid writing insecure code.
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