<s>
movemail	B-Protocol
is	O
a	O
computer	B-Application
program	I-Application
by	O
the	B-Application
GNU	I-Application
Project	I-Application
that	O
moves	O
mail	O
from	O
a	O
user	O
's	O
Unix	B-Application
mailspool	B-Device
to	O
another	O
file	O
.	O
</s>
<s>
A	O
compromising	O
of	O
movemail	B-Protocol
was	O
the	O
backbone	O
of	O
the	O
hack	O
described	O
in	O
The	O
Cuckoo	O
's	O
Egg	O
by	O
which	O
Markus	O
Hess	O
broke	O
into	O
the	O
Lawrence	O
Berkeley	O
National	O
Laboratory	O
computer	O
system	O
in	O
1986	O
.	O
</s>
<s>
The	O
flaw	O
in	O
movemail	B-Protocol
,	O
which	O
has	O
long	O
since	O
been	O
repaired	O
,	O
is	O
that	O
the	O
program	O
was	O
revised	O
in	O
1986	O
to	O
allow	O
superuser	B-Application
access	O
into	O
the	O
host	O
computer	O
in	O
order	O
to	O
move	O
POP	B-Protocol
email	I-Protocol
.	O
</s>
<s>
The	O
movemail	B-Protocol
bug	O
has	O
been	O
highlighted	O
as	O
one	O
of	O
the	O
Unix	B-Application
operating	I-Application
system	I-Application
family	O
's	O
most	O
egregious	O
failures	O
of	O
security	B-Operating_System
.	O
</s>
