<s>
A	O
pubstro	B-Application
is	O
a	O
computer	O
that	O
has	O
been	O
cracked	O
into	O
,	O
and	O
had	O
an	O
FTP	B-Protocol
server	O
installed	O
.	O
</s>
<s>
This	O
FTP	B-Protocol
server	O
is	O
used	O
to	O
facilitate	O
the	O
transferring	O
and	O
spreading	O
of	O
warez	B-Application
,	O
or	O
copyrighted	O
software	O
.	O
</s>
<s>
This	O
is	O
typically	O
accomplished	O
by	O
scanning	O
broad	O
IP	B-Protocol
address	I-Protocol
ranges	O
with	O
port	O
scanners	O
in	O
search	O
of	O
servers	O
running	O
open	O
ports	O
that	O
are	O
vulnerable	O
to	O
attack	O
by	O
various	O
scripts	O
(	O
e.g.	O
</s>
<s>
CGI	B-Language
,	O
PHP	B-Application
,	O
VNC	B-Protocol
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
Many	O
crackers	O
will	O
then	O
patch	O
the	O
server	O
against	O
the	O
very	O
vulnerabilities	O
they	O
utilized	O
to	O
compromise	O
the	O
system	O
thereby	O
protecting	O
it	O
from	O
being	O
hijacked	O
by	O
other	O
FXP	B-Protocol
groups	O
.	O
</s>
<s>
Although	O
widely	O
used	O
among	O
FXP	B-Application
boards	I-Application
,	O
pubstros	O
are	O
frowned	O
upon	O
in	O
the	O
warez	B-Application
scene	I-Application
.	O
</s>
