Data exchanged between an HTTP server and a browser (a client of the server) to store state information on the client side and retrieve it later for server use. An HTTP server, when sending data to a client, may send along a cookie, which the client retains after the HTTP connection closes. A server can use this mechanism to maintain persistent client-side state information for HTTP-based applications, retrieving the state information in later connections.
A threat action that undesirably alters system operation by adversely modifying system functions or data.
A cost benefit analysis compares the cost of implementing countermeasures with the value of the reduced risk.
Reactive methods used to prevent an exploit from successfully occurring once a threat has been detected. Intrusion Prevention Systems (IPS) commonly employ countermeasures to prevent intruders form gaining further access to a computer network. Other counter measures are patches, access control lists and malware filters.
Covert Channels are the means by which information can be communicated between two parties in a covert fashion using normal system operations. For example by changing the amount of hard drive space that is available on a file server can be used to communicate information.
Cron is a Unix application that runs jobs for users and administrators at scheduled times of the day.
Cross-site request forgery, also known as one-click attack or session riding and abbreviated as CSRF, is a type of malicious exploit of a website where unauthorized commands are transmitted from a user that the web application trusts. Unlike cross-site scripting (XSS), which exploits the trust a user has for a particular site, CSRF exploits the trust that a site has in a user's browser.