"joe will look for a configuration file in three
locations: the current directory, the users homedirectory ($HOME)
and in /etc/joe. Since the configuration file can define commands
joe will run (for example to check spelling) reading it from
the current directory can be dangerous: an attacker can leave
a .joerc file in a writable directory, which would be read when
a unsuspecting user starts joe in that directory." More information at LWN.net.
March 9, 2001