An attacker manipulates variables used by an application to perform a
						variet of possible attacks. This can either be performed through the
						manipulation of function call parameters or by manipulating external
						variables, such as environment variables, that are used by an application.
						Changing variable values is usually undertaken as part of another attack;
						for example, a path traversal (inserting relative path modifiers) or buffer
						overflow (enlarging a variable value beyond an application's ability to
						store it).