An attack of this type exploits a system's configuration that allows an
						attacker to either directly access an executable file, for example through
						shell access; or in a possible worst case allows an attacker to upload a
						file and then execute it. Web servers, ftp servers, and message oriented
						middleware systems which have many integration points are particularly
						vulnerable, because both the programmers and the administrators must be in
						synch regarding the interfaces and the correct privileges for each
						interface.