Web Definition: Back Door
A backdoor in a computer system is a method of bypassing normal authentication or obtaining remote access to a computer, while intended to remain hidden to casual inspection. The backdoor may take the form of an installed program or could be a modification to a legitimate program. A backdoor in a login system could take the form of a hard-coded user & password combination which gives access to the system. A famous example of this was used as a plot device in the 1983 film WarGames, wherein the designer of a computer system had inserted an undocumented password which gave the user access to the system & to undocumented aspects of its behavior. An attempt to plant a backdoor in the Linux kernel, exposed in November 2003, showed how subtle such a code change could be. In this case a two-line change took the form of an apparent typographical error, which in practice gave the caller to the sys_wait4 function root access to the machine. The prevalence of backdoors in proprietary software systems is a topic of speculation, but they have been occasionally exposed in practice.
Read More »Dictionary Entry: A door in the back part of a building - hence, an indirect way.
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