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PHP is a general-purpose scripting language that is especially suited to server-side web development, in which case PHP generally runs on a web server. Any PHP code in a requested file is executed by the PHP runtime, usually to create dynamic web page content or dynamic images used on websites or elsewhere. [281]
In computer science and networking in particular, a session is a time-delimited two-way link, a practical (relatively high) layer in the TCP/IP protocol enabling interactive expression and information exchange between two or more communication devices or ends – be they computers, automated systems, or live active users (see login session ).
Session ID. In computer science, a session identifier, session ID or session token is a piece of data that is used in network communications (often over HTTPS) to identify a session, a series of related message exchanges. Session identifiers become necessary in cases where the communications infrastructure uses a stateless protocol such as HTTP.
In computer science, session hijacking, sometimes also known as cookie hijacking, is the exploitation of a valid computer session —sometimes also called a session key —to gain unauthorized access to information or services in a computer system. In particular, it is used to refer to the theft of a magic cookie used to authenticate a user to ...
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Session pollution has also been covered in some articles, such as PHP Session Security, Przemek Sobstel, 2007. Attack examples Trivial attack scenario. An example code vulnerable to this problem is: Session("Login") = Request("login") Session("Username") = Request("username") Which is subject to trivial attacks such as
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Mallory is thus able to ghost the session from their original login, scraping data and executing operations as 'A1ice' on 'www.example.com'. If Alice was successfully duped and saved her credit card to the account, Mallory might then make purchases using that card. Countermeasures Do not accept session identifiers from GET / POST variables