<s>
Bliss	B-Application
is	O
a	O
computer	O
virus	O
,	O
introduced	O
in	O
1997	O
,	O
which	O
aims	O
to	O
infect	O
Linux	B-Application
systems	O
.	O
</s>
<s>
When	O
executed	O
,	O
it	O
attempts	O
to	O
attach	O
itself	O
to	O
Linux	B-Application
executable	B-Application
files	I-Application
,	O
to	O
which	O
regular	O
users	O
do	O
not	O
have	O
access	O
.	O
</s>
<s>
In	O
the	O
case	O
of	O
the	O
alpha	O
version	O
,	O
this	O
prevents	O
the	O
executables	B-Application
from	O
running	O
,	O
so	O
users	O
notice	O
it	O
immediately	O
.	O
</s>
<s>
Although	O
it	O
was	O
probably	O
intended	O
to	O
prove	O
that	O
Linux	B-Application
can	O
be	O
infected	O
,	O
it	O
does	O
not	O
propagate	O
very	O
effectively	O
because	O
of	O
the	O
structure	O
of	O
Linux	B-Application
's	O
user	O
privilege	O
system	O
.	O
</s>
<s>
The	O
Bliss	B-Application
virus	O
never	O
became	O
widespread	O
,	O
and	O
remains	O
chiefly	O
a	O
research	O
curiosity	O
.	O
</s>
<s>
After	O
the	O
Staog	B-Application
virus	O
it	O
is	O
the	O
second	O
known	O
Linux	B-Application
virus	I-Application
.	O
</s>
<s>
When	O
the	O
Bliss	B-Application
virus	O
was	O
released	O
,	O
antivirus	B-Application
software	I-Application
vendors	O
and	O
Linux	B-Application
distributions	O
released	O
security	O
advisories	O
to	O
notify	O
users	O
of	O
the	O
potential	O
risks	O
.	O
</s>
<s>
Debian	O
still	O
lists	O
itself	O
as	O
vulnerable	O
to	O
the	O
Bliss	B-Application
virus	O
.	O
</s>
